TY  - JOUR
AU  - Jegdić, Bore
AU  - Živković, Ljiljana S.
AU  - Popić, Jovan P.
AU  - Rogan, Jelena R.
AU  - Bajat, Jelena
AU  - Mišković-Stanković, Vesna
PY  - 2016
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1886
AB  - In this study, corrosion protection efficiency of undoped epoxy and epoxy coating doped with cerium on aluminum alloy AA6060 is evaluated over prolonged exposure to 3wt% NaCl solution by electrochemical impedance spectroscopy (EIS). Different amounts of Ce(NO3)(3) are added into the epoxy suspension used for the cataphoretic deposition. Suspension stability is characterized by zeta potential and particle size values. Water content and thermal stability of the coatings were determined by thermogravimetric analysis. Insufficient corrosion stability, very close to that of undoped epoxy, is revealed for the coating with 1mM Ce. Higher cerium doping contributes to a significant increase in corrosion stability (2-3 orders of magnitude greater charge-transfer resistance). Epoxy coating doped with 5mM Ce displays a pronounced self-healing ability and the best corrosion protection and adhesion, owing to evenly distributed cerium precipitates on the aluminum surface. In the case of 10mM Ce-doped coating, the formation of Ce clusters and higher porosity causes a certain lowering of the protective ability. EIS measurements on epoxy coating with artificial defect confirm these findings.
PB  - Wiley-V C H Verlag Gmbh, Weinheim
T2  - Materials and Corrosion-Werkstoffe und Korrosion
T1  - Corrosion stability of cerium-doped cataphoretic epoxy coatings on AA6060 alloy
VL  - 67
IS  - 11
SP  - 1173
EP  - 1184
DO  - 10.1002/maco.201608827
ER  - 

@article{
author = "Jegdić, Bore and Živković, Ljiljana S. and Popić, Jovan P. and Rogan, Jelena R. and Bajat, Jelena and Mišković-Stanković, Vesna",
year = "2016",
abstract = "In this study, corrosion protection efficiency of undoped epoxy and epoxy coating doped with cerium on aluminum alloy AA6060 is evaluated over prolonged exposure to 3wt% NaCl solution by electrochemical impedance spectroscopy (EIS). Different amounts of Ce(NO3)(3) are added into the epoxy suspension used for the cataphoretic deposition. Suspension stability is characterized by zeta potential and particle size values. Water content and thermal stability of the coatings were determined by thermogravimetric analysis. Insufficient corrosion stability, very close to that of undoped epoxy, is revealed for the coating with 1mM Ce. Higher cerium doping contributes to a significant increase in corrosion stability (2-3 orders of magnitude greater charge-transfer resistance). Epoxy coating doped with 5mM Ce displays a pronounced self-healing ability and the best corrosion protection and adhesion, owing to evenly distributed cerium precipitates on the aluminum surface. In the case of 10mM Ce-doped coating, the formation of Ce clusters and higher porosity causes a certain lowering of the protective ability. EIS measurements on epoxy coating with artificial defect confirm these findings.",
publisher = "Wiley-V C H Verlag Gmbh, Weinheim",
journal = "Materials and Corrosion-Werkstoffe und Korrosion",
title = "Corrosion stability of cerium-doped cataphoretic epoxy coatings on AA6060 alloy",
volume = "67",
number = "11",
pages = "1173-1184",
doi = "10.1002/maco.201608827"
}

Jegdić, B., Živković, L. S., Popić, J. P., Rogan, J. R., Bajat, J.,& Mišković-Stanković, V.. (2016). Corrosion stability of cerium-doped cataphoretic epoxy coatings on AA6060 alloy. in Materials and Corrosion-Werkstoffe und Korrosion
Wiley-V C H Verlag Gmbh, Weinheim., 67(11), 1173-1184.
https://doi.org/10.1002/maco.201608827

Jegdić B, Živković LS, Popić JP, Rogan JR, Bajat J, Mišković-Stanković V. Corrosion stability of cerium-doped cataphoretic epoxy coatings on AA6060 alloy. in Materials and Corrosion-Werkstoffe und Korrosion. 2016;67(11):1173-1184.
doi:10.1002/maco.201608827 .

Jegdić, Bore, Živković, Ljiljana S., Popić, Jovan P., Rogan, Jelena R., Bajat, Jelena, Mišković-Stanković, Vesna, "Corrosion stability of cerium-doped cataphoretic epoxy coatings on AA6060 alloy" in Materials and Corrosion-Werkstoffe und Korrosion, 67, no. 11 (2016):1173-1184,
https://doi.org/10.1002/maco.201608827 . .

TY  - JOUR
AU  - Jegdić, Bore
AU  - Popić, Jovan P.
AU  - Bobić, Biljana
AU  - Stevanović, Maja
PY  - 2016
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1869
AB  - In this paper, phenomena of chemical corrosion of metals and alloys in electrolyte solutions are analyzed. It is shown that iron, chromium and other metals and alloys dissolve much faster than is the corrosion rate determined by electrochemical methods. This means that the chemical dissolution takes place simultaneously with the electrochemical dissolution. The chemical dissolution does not depend on electrode potential. Under some conditions, chemical dissolution of metals is the dominant process of dissolution. Several mechanisms of chemical corrosion are described. Also, the consequences of chemical dissolution of various metals and alloys are discussed, as well as the hydrogen evolution during the chemical dissolution. The process of hydrogen evolution during the chemical corrosion is not subjected to the laws of electrochemical kinetics.
AB  - U ovom preglednom radu analizirana je hemijska korozija metala i legura u rastvorima elektrolita. Pokazano je da se gvožđe, hrom i neki drugi metali i legure rastvaraju mnogo brže nego što je njihova brzina korozije određena elektrohemijskim metodama. To znači da se istovremeno sa elektrohemijskim rastvaranjem odvija i hemijsko rastvaranje, koje ne zavisi od potencijala. U nekim uslovima hemijsko rastvaranje metala je dominantan proces rastvaranja. Opisano je više mehanizama hemijske korozije. Takođe, razmatrane su posledice hemijskog rastvaranja različitih metala i legura, kao i pojava izdvajanja vodonika pri hemijskom rastvaranju. Proces izdvajanja vodonika pri hemijskoj koroziji ne podleže zakonitostima elektrohemijske kinetike.
PB  - Belgrade, Serbia : Engineering Society for Corrosion
T2  - Zaštita materijala
T1  - Chemical corrosion of metals and alloys
T1  - Hemijska korozija metala i legura
VL  - 57
IS  - 2
SP  - 205
EP  - 211
DO  - 10.5937/ZasMat1602205J
ER  - 

@article{
author = "Jegdić, Bore and Popić, Jovan P. and Bobić, Biljana and Stevanović, Maja",
year = "2016",
abstract = "In this paper, phenomena of chemical corrosion of metals and alloys in electrolyte solutions are analyzed. It is shown that iron, chromium and other metals and alloys dissolve much faster than is the corrosion rate determined by electrochemical methods. This means that the chemical dissolution takes place simultaneously with the electrochemical dissolution. The chemical dissolution does not depend on electrode potential. Under some conditions, chemical dissolution of metals is the dominant process of dissolution. Several mechanisms of chemical corrosion are described. Also, the consequences of chemical dissolution of various metals and alloys are discussed, as well as the hydrogen evolution during the chemical dissolution. The process of hydrogen evolution during the chemical corrosion is not subjected to the laws of electrochemical kinetics., U ovom preglednom radu analizirana je hemijska korozija metala i legura u rastvorima elektrolita. Pokazano je da se gvožđe, hrom i neki drugi metali i legure rastvaraju mnogo brže nego što je njihova brzina korozije određena elektrohemijskim metodama. To znači da se istovremeno sa elektrohemijskim rastvaranjem odvija i hemijsko rastvaranje, koje ne zavisi od potencijala. U nekim uslovima hemijsko rastvaranje metala je dominantan proces rastvaranja. Opisano je više mehanizama hemijske korozije. Takođe, razmatrane su posledice hemijskog rastvaranja različitih metala i legura, kao i pojava izdvajanja vodonika pri hemijskom rastvaranju. Proces izdvajanja vodonika pri hemijskoj koroziji ne podleže zakonitostima elektrohemijske kinetike.",
publisher = "Belgrade, Serbia : Engineering Society for Corrosion",
journal = "Zaštita materijala",
title = "Chemical corrosion of metals and alloys, Hemijska korozija metala i legura",
volume = "57",
number = "2",
pages = "205-211",
doi = "10.5937/ZasMat1602205J"
}

Jegdić, B., Popić, J. P., Bobić, B.,& Stevanović, M.. (2016). Chemical corrosion of metals and alloys. in Zaštita materijala
Belgrade, Serbia : Engineering Society for Corrosion., 57(2), 205-211.
https://doi.org/10.5937/ZasMat1602205J

Jegdić B, Popić JP, Bobić B, Stevanović M. Chemical corrosion of metals and alloys. in Zaštita materijala. 2016;57(2):205-211.
doi:10.5937/ZasMat1602205J .

Jegdić, Bore, Popić, Jovan P., Bobić, Biljana, Stevanović, Maja, "Chemical corrosion of metals and alloys" in Zaštita materijala, 57, no. 2 (2016):205-211,
https://doi.org/10.5937/ZasMat1602205J . .

TY  - JOUR
AU  - Živković, Ljiljana S.
AU  - Bajat, Jelena
AU  - Popić, Jovan P.
AU  - Jegdić, Bore
AU  - Stevanović, Sanja
AU  - Mišković-Stanković, Vesna
PY  - 2015
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1739
AB  - Ce-based conversion coatings (CeCCs) are a promising alternative to toxic chromate coatings on the metal substrates. In this work the CeCCs were electrodeposited on aluminium alloy AA6060 from aqueous solution of Ce(NO3)(3) at different potentials (-0.95 V, -1.2 V and -1.4V). Effect of deposition potential and post-treatment in the phosphate solution on morphology and protective properties of CeCCs with top cataphoretic epoxy coating was studied. To assess the differences between the protective systems, originating from the different CeCCs pre-treatments, electrochemical impedance spectroscopy (EIS), polarization measurements, AFM and SEM/EDS analysis were used. The EIS study was undertaken to follow the evolution of corrosion behaviour of epoxy coating/CeCCs protective systems over prolonged time of exposure to the chloride environment (3 wt.% NaCl). Results suggest significantly improved corrosion stability of epoxy coating on AA6060 with as-deposited CeCCs sub-layers with respect to the same epoxy coatings with phosphate post-treated CeCCs. The far best protective properties, i.e., the greatest value of pore resistance and the lowest value of corrosion current density were provided by the epoxy coating/CeCC protective system with CeCC deposited at -1.2V and without post-treatment.
PB  - Elsevier Science Sa, Lausanne
T2  - Progress in Organic Coatings
T1  - Protective properties of cataphoretic epoxy coating on aluminium alloy AA6060 modified with electrodeposited Ce-based coatings: Effect of post-treatment
VL  - 79
SP  - 43
EP  - 52
DO  - 10.1016/j.porgcoat.2014.10.014
ER  - 

@article{
author = "Živković, Ljiljana S. and Bajat, Jelena and Popić, Jovan P. and Jegdić, Bore and Stevanović, Sanja and Mišković-Stanković, Vesna",
year = "2015",
abstract = "Ce-based conversion coatings (CeCCs) are a promising alternative to toxic chromate coatings on the metal substrates. In this work the CeCCs were electrodeposited on aluminium alloy AA6060 from aqueous solution of Ce(NO3)(3) at different potentials (-0.95 V, -1.2 V and -1.4V). Effect of deposition potential and post-treatment in the phosphate solution on morphology and protective properties of CeCCs with top cataphoretic epoxy coating was studied. To assess the differences between the protective systems, originating from the different CeCCs pre-treatments, electrochemical impedance spectroscopy (EIS), polarization measurements, AFM and SEM/EDS analysis were used. The EIS study was undertaken to follow the evolution of corrosion behaviour of epoxy coating/CeCCs protective systems over prolonged time of exposure to the chloride environment (3 wt.% NaCl). Results suggest significantly improved corrosion stability of epoxy coating on AA6060 with as-deposited CeCCs sub-layers with respect to the same epoxy coatings with phosphate post-treated CeCCs. The far best protective properties, i.e., the greatest value of pore resistance and the lowest value of corrosion current density were provided by the epoxy coating/CeCC protective system with CeCC deposited at -1.2V and without post-treatment.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Progress in Organic Coatings",
title = "Protective properties of cataphoretic epoxy coating on aluminium alloy AA6060 modified with electrodeposited Ce-based coatings: Effect of post-treatment",
volume = "79",
pages = "43-52",
doi = "10.1016/j.porgcoat.2014.10.014"
}

Živković, L. S., Bajat, J., Popić, J. P., Jegdić, B., Stevanović, S.,& Mišković-Stanković, V.. (2015). Protective properties of cataphoretic epoxy coating on aluminium alloy AA6060 modified with electrodeposited Ce-based coatings: Effect of post-treatment. in Progress in Organic Coatings
Elsevier Science Sa, Lausanne., 79, 43-52.
https://doi.org/10.1016/j.porgcoat.2014.10.014

Živković LS, Bajat J, Popić JP, Jegdić B, Stevanović S, Mišković-Stanković V. Protective properties of cataphoretic epoxy coating on aluminium alloy AA6060 modified with electrodeposited Ce-based coatings: Effect of post-treatment. in Progress in Organic Coatings. 2015;79:43-52.
doi:10.1016/j.porgcoat.2014.10.014 .

Živković, Ljiljana S., Bajat, Jelena, Popić, Jovan P., Jegdić, Bore, Stevanović, Sanja, Mišković-Stanković, Vesna, "Protective properties of cataphoretic epoxy coating on aluminium alloy AA6060 modified with electrodeposited Ce-based coatings: Effect of post-treatment" in Progress in Organic Coatings, 79 (2015):43-52,
https://doi.org/10.1016/j.porgcoat.2014.10.014 . .

TY  - CONF
AU  - Bajat, Jelena
AU  - Živković, Ljiljana S.
AU  - Jegdić, Bore
AU  - Popić, Jovan P.
AU  - Mišković-Stanković, Vesna
PY  - 2015
UR  - http://www.aseee.eu/index.php/rse-see5-home
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3555
AB  - Protective coatings should provide good barrier to ingress of corrosive species, sufficient adhesion to the substrate as well as good compatibility with additional top coats. The presence of pigments and/or functional agents in the coating composition could be beneficial in the corrosion protection. The doping with rare earth elements, like cerium, has shown to enhance the corrosion stability of organic coatings due to their self-healing properties. In this work cerium doped nanometric epoxy primers were deposited cataphoretically with different amounts of cerium nitrate (1, 5 and 10 mM) with the aim of optimizing the cerium content in the epoxy emulsion with respect to adhesion and corrosion stability of deposited primer coating. Cerium-free epoxy coating was also analyzed as a reference. The long term protection was evaluated in the chloride environment (3 wt.%NaCl) using electrochemical impedance spectroscopy (EIS) and polarization measurements. Coatings were also analyzed by scanning electron microscopy (SEM) coupled with EDX, Fourier transform infrared spectroscopy and thermogravimetric measurements. Size and zeta potential of epoxy emulsion were measured by dynamic light scattering and Laser Doppler velocimetry. Adhesion was determined both by a standardized pull-off method and by swelling in N-methyl pyrrolidone. The ceria content, as well as its distribution in the epoxy coating, was determined by SEM cross-sectional analysis. The homogeneity of epoxy coatings was evaluated and related to corrosion stability. The results showed that cerium-doping can promote the formation of compact epoxy coatings with enhanced protectiveness in the early stage of immersion in the corrosive media. Increased barrier properties of epoxy primers suggest good compatibility of ceria particles with polymeric epoxy layer. However, zeta potential measurements indicated that higher amounts than 10 mM Ce(NO3)3 added into the epoxy emulsion resulted in unstable emulsion. The water content in the epoxy coatings and their thermal stability were also determined. In addition, a detailed EIS study was undertaken to follow the evolution of corrosion stability of all samples with time of exposure to corrosive media. It was shown that all examined ceria containing epoxy emulsions resulted with the enhanced adhesion and corrosion stability of epoxy primers. However, the smallest loading of 1 mM showed only improvement during the initial exposure to NaCl solution. EIS and polarization measurements confirmed that higher ceria loadings also provide long term protection in chloride solution.The optimal ceria content in the epoxy emulsion, with respect to adhesion strength, thermal stability and long-term corrosion stability of protective systems was 10 mM.
PB  - Academician Evgeni Budevski Institute of Electrochemistry and Energy Systems Bulgarian Academy of Sciences, Sofia, Bulgaria
C3  - 5th Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Program and Book of Abstracts
T1  - Corrosion Stability of Cerium Modified Cataphoretic Epoxy Coatings on Al6060 Alloy
SP  - 44
EP  - 44
UR  - https://hdl.handle.net/21.15107/rcub_cer_3555
ER  - 

@conference{
author = "Bajat, Jelena and Živković, Ljiljana S. and Jegdić, Bore and Popić, Jovan P. and Mišković-Stanković, Vesna",
year = "2015",
abstract = "Protective coatings should provide good barrier to ingress of corrosive species, sufficient adhesion to the substrate as well as good compatibility with additional top coats. The presence of pigments and/or functional agents in the coating composition could be beneficial in the corrosion protection. The doping with rare earth elements, like cerium, has shown to enhance the corrosion stability of organic coatings due to their self-healing properties. In this work cerium doped nanometric epoxy primers were deposited cataphoretically with different amounts of cerium nitrate (1, 5 and 10 mM) with the aim of optimizing the cerium content in the epoxy emulsion with respect to adhesion and corrosion stability of deposited primer coating. Cerium-free epoxy coating was also analyzed as a reference. The long term protection was evaluated in the chloride environment (3 wt.%NaCl) using electrochemical impedance spectroscopy (EIS) and polarization measurements. Coatings were also analyzed by scanning electron microscopy (SEM) coupled with EDX, Fourier transform infrared spectroscopy and thermogravimetric measurements. Size and zeta potential of epoxy emulsion were measured by dynamic light scattering and Laser Doppler velocimetry. Adhesion was determined both by a standardized pull-off method and by swelling in N-methyl pyrrolidone. The ceria content, as well as its distribution in the epoxy coating, was determined by SEM cross-sectional analysis. The homogeneity of epoxy coatings was evaluated and related to corrosion stability. The results showed that cerium-doping can promote the formation of compact epoxy coatings with enhanced protectiveness in the early stage of immersion in the corrosive media. Increased barrier properties of epoxy primers suggest good compatibility of ceria particles with polymeric epoxy layer. However, zeta potential measurements indicated that higher amounts than 10 mM Ce(NO3)3 added into the epoxy emulsion resulted in unstable emulsion. The water content in the epoxy coatings and their thermal stability were also determined. In addition, a detailed EIS study was undertaken to follow the evolution of corrosion stability of all samples with time of exposure to corrosive media. It was shown that all examined ceria containing epoxy emulsions resulted with the enhanced adhesion and corrosion stability of epoxy primers. However, the smallest loading of 1 mM showed only improvement during the initial exposure to NaCl solution. EIS and polarization measurements confirmed that higher ceria loadings also provide long term protection in chloride solution.The optimal ceria content in the epoxy emulsion, with respect to adhesion strength, thermal stability and long-term corrosion stability of protective systems was 10 mM.",
publisher = "Academician Evgeni Budevski Institute of Electrochemistry and Energy Systems Bulgarian Academy of Sciences, Sofia, Bulgaria",
journal = "5th Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Program and Book of Abstracts",
title = "Corrosion Stability of Cerium Modified Cataphoretic Epoxy Coatings on Al6060 Alloy",
pages = "44-44",
url = "https://hdl.handle.net/21.15107/rcub_cer_3555"
}

Bajat, J., Živković, L. S., Jegdić, B., Popić, J. P.,& Mišković-Stanković, V.. (2015). Corrosion Stability of Cerium Modified Cataphoretic Epoxy Coatings on Al6060 Alloy. in 5th Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Program and Book of Abstracts
Academician Evgeni Budevski Institute of Electrochemistry and Energy Systems Bulgarian Academy of Sciences, Sofia, Bulgaria., 44-44.
https://hdl.handle.net/21.15107/rcub_cer_3555

Bajat J, Živković LS, Jegdić B, Popić JP, Mišković-Stanković V. Corrosion Stability of Cerium Modified Cataphoretic Epoxy Coatings on Al6060 Alloy. in 5th Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Program and Book of Abstracts. 2015;:44-44.
https://hdl.handle.net/21.15107/rcub_cer_3555 .

Bajat, Jelena, Živković, Ljiljana S., Jegdić, Bore, Popić, Jovan P., Mišković-Stanković, Vesna, "Corrosion Stability of Cerium Modified Cataphoretic Epoxy Coatings on Al6060 Alloy" in 5th Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Program and Book of Abstracts (2015):44-44,
https://hdl.handle.net/21.15107/rcub_cer_3555 .

TY  - JOUR
AU  - Živković, Ljiljana S.
AU  - Popić, Jovan P.
AU  - Jegdić, Bore
AU  - Dohcevic-Mitrovic, Z.
AU  - Bajat, Jelena
AU  - Mišković-Stanković, Vesna
PY  - 2014
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1547
AB  - Among potential replacements for chromates, cerium-based conversion coatings (CeCCs) have been identified as leading candidates, showing a good promise as environmentally compliant corrosion inhibitors on Al alloys. In this work, CeCCs were synthesized on M6060 by electrolytic deposition (ELD), a well-suited method for the fabrication of films with controllable properties, at low processing temperature and cost. The CeCCs were deposited at room temperature from Ce(NO3)(3) solution, applying different cathodic potentials (-1.1, -1.4 and -1.6 V vs. SCE) for different deposition times between 5 and 20 min. Structural, morphological and compositional properties of the films were characterized by X-ray diffraction, Raman spectroscopy and scanning electron microscopy coupled with energy dispersive spectroscopy. Ceria films were nanostructured, exhibiting a cubic fluorite structure. From corrosion perspective, the quality of CeCCs was evaluated in 0.5 M NaCI solution via electrochemical impedance spectroscopy and linear sweep voltammetry. As shown, the coating corrosion quality is the interplay between deposition potential and deposition time. The highest potential led to highly cracked films of poor adherence, even at the shortest deposition time, which disqualified them from any corrosion protection application. The lowest potential (-1.1 V) produced crack-free coatings, but longer times (>= 10 min) were needed to provide the protective layer formation. The best corrosion protection offered CeCCs prepared at -1.4 V. The highest R-p (582 k Omega cm(2)) and the smallest CPE (12.6 . 10(-6) s(n) Omega(-1) cm) were obtained at 20 min deposition time. However, from economical point of view, 10 min deposition is a promising choice. These CeCCs also improved pitting corrosion resistance owing to homogeneous microstructure and sufficient thickness.
PB  - Elsevier
T2  - Surface and Coatings Technology
T1  - Corrosion study of ceria coatings on AA6060 aluminum alloy obtained by cathodic electrodeposition: Effect of deposition potential
VL  - 240
SP  - 327
EP  - 335
DO  - 10.1016/j.surfcoat.2013.12.048
ER  - 

@article{
author = "Živković, Ljiljana S. and Popić, Jovan P. and Jegdić, Bore and Dohcevic-Mitrovic, Z. and Bajat, Jelena and Mišković-Stanković, Vesna",
year = "2014",
abstract = "Among potential replacements for chromates, cerium-based conversion coatings (CeCCs) have been identified as leading candidates, showing a good promise as environmentally compliant corrosion inhibitors on Al alloys. In this work, CeCCs were synthesized on M6060 by electrolytic deposition (ELD), a well-suited method for the fabrication of films with controllable properties, at low processing temperature and cost. The CeCCs were deposited at room temperature from Ce(NO3)(3) solution, applying different cathodic potentials (-1.1, -1.4 and -1.6 V vs. SCE) for different deposition times between 5 and 20 min. Structural, morphological and compositional properties of the films were characterized by X-ray diffraction, Raman spectroscopy and scanning electron microscopy coupled with energy dispersive spectroscopy. Ceria films were nanostructured, exhibiting a cubic fluorite structure. From corrosion perspective, the quality of CeCCs was evaluated in 0.5 M NaCI solution via electrochemical impedance spectroscopy and linear sweep voltammetry. As shown, the coating corrosion quality is the interplay between deposition potential and deposition time. The highest potential led to highly cracked films of poor adherence, even at the shortest deposition time, which disqualified them from any corrosion protection application. The lowest potential (-1.1 V) produced crack-free coatings, but longer times (>= 10 min) were needed to provide the protective layer formation. The best corrosion protection offered CeCCs prepared at -1.4 V. The highest R-p (582 k Omega cm(2)) and the smallest CPE (12.6 . 10(-6) s(n) Omega(-1) cm) were obtained at 20 min deposition time. However, from economical point of view, 10 min deposition is a promising choice. These CeCCs also improved pitting corrosion resistance owing to homogeneous microstructure and sufficient thickness.",
publisher = "Elsevier",
journal = "Surface and Coatings Technology",
title = "Corrosion study of ceria coatings on AA6060 aluminum alloy obtained by cathodic electrodeposition: Effect of deposition potential",
volume = "240",
pages = "327-335",
doi = "10.1016/j.surfcoat.2013.12.048"
}

Živković, L. S., Popić, J. P., Jegdić, B., Dohcevic-Mitrovic, Z., Bajat, J.,& Mišković-Stanković, V.. (2014). Corrosion study of ceria coatings on AA6060 aluminum alloy obtained by cathodic electrodeposition: Effect of deposition potential. in Surface and Coatings Technology
Elsevier., 240, 327-335.
https://doi.org/10.1016/j.surfcoat.2013.12.048

Živković LS, Popić JP, Jegdić B, Dohcevic-Mitrovic Z, Bajat J, Mišković-Stanković V. Corrosion study of ceria coatings on AA6060 aluminum alloy obtained by cathodic electrodeposition: Effect of deposition potential. in Surface and Coatings Technology. 2014;240:327-335.
doi:10.1016/j.surfcoat.2013.12.048 .

Živković, Ljiljana S., Popić, Jovan P., Jegdić, Bore, Dohcevic-Mitrovic, Z., Bajat, Jelena, Mišković-Stanković, Vesna, "Corrosion study of ceria coatings on AA6060 aluminum alloy obtained by cathodic electrodeposition: Effect of deposition potential" in Surface and Coatings Technology, 240 (2014):327-335,
https://doi.org/10.1016/j.surfcoat.2013.12.048 . .

TY  - JOUR
AU  - Jegdić, Bore
AU  - Živković, Ljiljana S.
AU  - Popić, Jovan P.
AU  - Bajat, Jelena
AU  - Mišković-Stanković, Vesna
PY  - 2013
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1207
AB  - Dip-immersion is a simple and cost-effective method for the preparation of Ce-based conversion coatings (CeCCs), a promising alternative to toxic chromate coatings, on metal substrates. In this work, CeCCs were prepared on Al-alloy AA6060 from an aqueous solution of cerium chloride at room temperature. The effect of immersion time and post-treatment in phosphate solution on the microstructure and corrosion properties of the coatings was studied. The longer the immersion time was, the thicker but more nonhomogeneous and cracked were the CeCCs. The post-treatment contributed to a sealing of the cracks, as proven by an increase in the corrosion resistance compared with the as-deposited coatings. The CeCCs prepared at longer deposition times and post-treated showed much better corrosion protection than those prepared at shorter deposition times. A detailed electrochemical impedance spectroscopy (EIS) study was undertaken to follow the evolution of the corrosion behaviour of the CeCCs with time of exposure to an aggressive chloride environment (3.5 % NaCl). For the sake of comparison, the EIS properties of bare AA6060 were also investigated. Linear voltammetry was performed to complete the study. The results confirmed the formation of protective CeCCs on the surface of AA6060. However, even CeCCs prepared at longer deposition times and post-treated provided short term protection in the aggressive environment, due to the small thickness of the coating.
AB  - Nanošenje prevlaka potapanjem u rastvor je jednostavna i ekonomski prihvatljiva metoda za pripremu konverzionih prevlaka na bazi cerijuma na metalnim supstratima, koje su dobra zamena za toksične hromatne prevlake. U ovom radu prevlake na bazi cerijuma su nanesene na aluminijumsku leguru AA6060 iz vodenog rastvora cerijum-hlorida na sobnoj temperaturi. Ispitivan je uticaj vremena potapanja i uticaj naknadnog tretmana u fosfatnom rastvoru na mikrostrukturu i zaštitna svojstva dobijenih prevlaka. Dužim potapanjem su dobijene deblje ali nehomogene prevlake. Naknadni tretman je povoljno uticao na zatvaranje prskotina, što je u saglasnosti sa izmerenom većom korozionom otpornošću u poređenju sa prevlakama bez tretmana. Prevlake dobijene dužim nanošenjem su pokazale bolju korozionu zaštitu od prevlaka dobijenih kraćim nanošenjem. Koroziona stabilnost prevlaka je ispitivana u agresivnoj hloridnoj sredini (3,5 % NaCl) metodama spektroskopije elektrohemijske impedancije (SEI) i linearne voltametrije. Detaljno je praćeno koroziono ponašanje prevlaka sa vremenom delovanja korozionog agensa. Poređenja radi, SEI analiza je sprovedena i za leguru AA6060 bez prevlake. Rezultati istraživanja potvrđuju da dobijene prevlake na bazi cerijuma predstavljaju dobru korozionu zaštitu leguri AA6060. Međutim, čak i kvalitetnija prevlaka (20 min potapanja i naknadno tretirana u fosfatnom rastvoru) obezbeđuje leguri kratkoročnu zaštitu u agresivnoj sredini usled svoje male debljine.
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Electrochemical methods for corrosion testing of Ce-based coatings prepared on AA6060 alloy by the dip immersion method
T1  - Elektrohemijske metode za ispitivanje korozione stabilnosti prevlaka na bazi cerijuma dobijenih potapanjem na leguri AA6060
VL  - 78
IS  - 7
SP  - 997
EP  - 1011
DO  - 10.2298/JSC121212009J
ER  - 

@article{
author = "Jegdić, Bore and Živković, Ljiljana S. and Popić, Jovan P. and Bajat, Jelena and Mišković-Stanković, Vesna",
year = "2013",
abstract = "Dip-immersion is a simple and cost-effective method for the preparation of Ce-based conversion coatings (CeCCs), a promising alternative to toxic chromate coatings, on metal substrates. In this work, CeCCs were prepared on Al-alloy AA6060 from an aqueous solution of cerium chloride at room temperature. The effect of immersion time and post-treatment in phosphate solution on the microstructure and corrosion properties of the coatings was studied. The longer the immersion time was, the thicker but more nonhomogeneous and cracked were the CeCCs. The post-treatment contributed to a sealing of the cracks, as proven by an increase in the corrosion resistance compared with the as-deposited coatings. The CeCCs prepared at longer deposition times and post-treated showed much better corrosion protection than those prepared at shorter deposition times. A detailed electrochemical impedance spectroscopy (EIS) study was undertaken to follow the evolution of the corrosion behaviour of the CeCCs with time of exposure to an aggressive chloride environment (3.5 % NaCl). For the sake of comparison, the EIS properties of bare AA6060 were also investigated. Linear voltammetry was performed to complete the study. The results confirmed the formation of protective CeCCs on the surface of AA6060. However, even CeCCs prepared at longer deposition times and post-treated provided short term protection in the aggressive environment, due to the small thickness of the coating., Nanošenje prevlaka potapanjem u rastvor je jednostavna i ekonomski prihvatljiva metoda za pripremu konverzionih prevlaka na bazi cerijuma na metalnim supstratima, koje su dobra zamena za toksične hromatne prevlake. U ovom radu prevlake na bazi cerijuma su nanesene na aluminijumsku leguru AA6060 iz vodenog rastvora cerijum-hlorida na sobnoj temperaturi. Ispitivan je uticaj vremena potapanja i uticaj naknadnog tretmana u fosfatnom rastvoru na mikrostrukturu i zaštitna svojstva dobijenih prevlaka. Dužim potapanjem su dobijene deblje ali nehomogene prevlake. Naknadni tretman je povoljno uticao na zatvaranje prskotina, što je u saglasnosti sa izmerenom većom korozionom otpornošću u poređenju sa prevlakama bez tretmana. Prevlake dobijene dužim nanošenjem su pokazale bolju korozionu zaštitu od prevlaka dobijenih kraćim nanošenjem. Koroziona stabilnost prevlaka je ispitivana u agresivnoj hloridnoj sredini (3,5 % NaCl) metodama spektroskopije elektrohemijske impedancije (SEI) i linearne voltametrije. Detaljno je praćeno koroziono ponašanje prevlaka sa vremenom delovanja korozionog agensa. Poređenja radi, SEI analiza je sprovedena i za leguru AA6060 bez prevlake. Rezultati istraživanja potvrđuju da dobijene prevlake na bazi cerijuma predstavljaju dobru korozionu zaštitu leguri AA6060. Međutim, čak i kvalitetnija prevlaka (20 min potapanja i naknadno tretirana u fosfatnom rastvoru) obezbeđuje leguri kratkoročnu zaštitu u agresivnoj sredini usled svoje male debljine.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Electrochemical methods for corrosion testing of Ce-based coatings prepared on AA6060 alloy by the dip immersion method, Elektrohemijske metode za ispitivanje korozione stabilnosti prevlaka na bazi cerijuma dobijenih potapanjem na leguri AA6060",
volume = "78",
number = "7",
pages = "997-1011",
doi = "10.2298/JSC121212009J"
}

Jegdić, B., Živković, L. S., Popić, J. P., Bajat, J.,& Mišković-Stanković, V.. (2013). Electrochemical methods for corrosion testing of Ce-based coatings prepared on AA6060 alloy by the dip immersion method. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 78(7), 997-1011.
https://doi.org/10.2298/JSC121212009J

Jegdić B, Živković LS, Popić JP, Bajat J, Mišković-Stanković V. Electrochemical methods for corrosion testing of Ce-based coatings prepared on AA6060 alloy by the dip immersion method. in Journal of the Serbian Chemical Society. 2013;78(7):997-1011.
doi:10.2298/JSC121212009J .

Jegdić, Bore, Živković, Ljiljana S., Popić, Jovan P., Bajat, Jelena, Mišković-Stanković, Vesna, "Electrochemical methods for corrosion testing of Ce-based coatings prepared on AA6060 alloy by the dip immersion method" in Journal of the Serbian Chemical Society, 78, no. 7 (2013):997-1011,
https://doi.org/10.2298/JSC121212009J . .

TY  - JOUR
AU  - Živković, Ljiljana S.
AU  - Jegdić, Bore
AU  - Popić, Jovan P.
AU  - Bajat, Jelena
AU  - Mišković-Stanković, Vesna
PY  - 2013
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1217
AB  - Cerium-based conversion coatings (CeCCs) are one of the most prospective alternatives to the widely used chromate conversion coatings (CCCs) due to their anticorrosion efficiency, environmentally friendly nature and low cost. In this work, the CeCCs on AA6060 were prepared by immersion into aqueous cerium salt solutions at room temperature, and subsequently post-treated in heated phosphate solution. The effect of counter ion (nitrate and chloride) on the coating properties was studied testing CeCCs as sole or conversion layers for the top polyester coating. Since the 60 mu m thick polyester coating was applied, an artificial defect of 0.8 mm hole was introduced to faster assess the differences between pretreatments. The system with CCC pretreatment was used as reference. Corrosion properties were investigated in 0.5 M NaCl solution by electrochemical impedance spectroscopy while the adhesion strength was measured by NMPR (N-methyl-2-pyrrolidone) and pull-off tests. As shown, the post-treated chloride-based CeCC offered better protection than crack-free thin nitrate-based CeCC, when used as sole coatings. On the other hand, it was brought to evidence that in combination with top powder polyester coating, the CeCC deposited from nitrate solution exhibited better protection compared to protective system pretreated with chloride-based one. Excellent polyester coating adhesion was found independently on aluminium surface pretreatment.
PB  - Elsevier Science Sa, Lausanne
T2  - Progress in Organic Coatings
T1  - The influence of Ce-based coatings as pretreatments on corrosion stability of top powder polyester coating on AA6060
VL  - 76
IS  - 10
SP  - 1387
EP  - 1395
DO  - 10.1016/j.porgcoat.2013.04.017
ER  - 

@article{
author = "Živković, Ljiljana S. and Jegdić, Bore and Popić, Jovan P. and Bajat, Jelena and Mišković-Stanković, Vesna",
year = "2013",
abstract = "Cerium-based conversion coatings (CeCCs) are one of the most prospective alternatives to the widely used chromate conversion coatings (CCCs) due to their anticorrosion efficiency, environmentally friendly nature and low cost. In this work, the CeCCs on AA6060 were prepared by immersion into aqueous cerium salt solutions at room temperature, and subsequently post-treated in heated phosphate solution. The effect of counter ion (nitrate and chloride) on the coating properties was studied testing CeCCs as sole or conversion layers for the top polyester coating. Since the 60 mu m thick polyester coating was applied, an artificial defect of 0.8 mm hole was introduced to faster assess the differences between pretreatments. The system with CCC pretreatment was used as reference. Corrosion properties were investigated in 0.5 M NaCl solution by electrochemical impedance spectroscopy while the adhesion strength was measured by NMPR (N-methyl-2-pyrrolidone) and pull-off tests. As shown, the post-treated chloride-based CeCC offered better protection than crack-free thin nitrate-based CeCC, when used as sole coatings. On the other hand, it was brought to evidence that in combination with top powder polyester coating, the CeCC deposited from nitrate solution exhibited better protection compared to protective system pretreated with chloride-based one. Excellent polyester coating adhesion was found independently on aluminium surface pretreatment.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Progress in Organic Coatings",
title = "The influence of Ce-based coatings as pretreatments on corrosion stability of top powder polyester coating on AA6060",
volume = "76",
number = "10",
pages = "1387-1395",
doi = "10.1016/j.porgcoat.2013.04.017"
}

Živković, L. S., Jegdić, B., Popić, J. P., Bajat, J.,& Mišković-Stanković, V.. (2013). The influence of Ce-based coatings as pretreatments on corrosion stability of top powder polyester coating on AA6060. in Progress in Organic Coatings
Elsevier Science Sa, Lausanne., 76(10), 1387-1395.
https://doi.org/10.1016/j.porgcoat.2013.04.017

Živković LS, Jegdić B, Popić JP, Bajat J, Mišković-Stanković V. The influence of Ce-based coatings as pretreatments on corrosion stability of top powder polyester coating on AA6060. in Progress in Organic Coatings. 2013;76(10):1387-1395.
doi:10.1016/j.porgcoat.2013.04.017 .

Živković, Ljiljana S., Jegdić, Bore, Popić, Jovan P., Bajat, Jelena, Mišković-Stanković, Vesna, "The influence of Ce-based coatings as pretreatments on corrosion stability of top powder polyester coating on AA6060" in Progress in Organic Coatings, 76, no. 10 (2013):1387-1395,
https://doi.org/10.1016/j.porgcoat.2013.04.017 . .

TY  - JOUR
AU  - Popić, Jovan P.
AU  - Jegdić, Bore
AU  - Bajat, Jelena
AU  - Mitrić, Miodrag
AU  - Mišković-Stanković, Vesna
PY  - 2013
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1310
AB  - In this study, the effect of deposition time and concentration of NaNO2 in the phosphate bath on the surface morphology of iron-phosphate coatings on low carbon steel was investigated using scanning electron microscopy (SEM) and atomic force microscopy (AFM). The composition of ironphosphate coatings was determined using energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD), while surface coverage was evaluated by the voltammetric anodic dissolution (VAD) technique in the borate solution. The addition of NaNO2 to the phosphate bath significantly increased the surface coverage since better packed crystals of smaller size, which favour the phosphate nucleation, were obtained. It was also shown that prolonged deposition time increased the surface coverage, coating roughness and crystal size in the lateral direction, altering also the crystal shape from large platelets non-uniformly distributed on the steel surface during the initial time to better packed laminated and needle-like structures during prolonged exposure.
AB  - U ovom radu je, primenom skenirajuće elektronske mikroskopije (SEM) i mikro- skopije međuatomskih sila (AFM), ispitivan uticaj vremena taloženja i koncentracije NaNO2 u rastvoru za fosfatiranje na morfologiju gvožđe-fosfatnih prevlaka na nisko-ugljeničnom čeliku. Sastav gvožđe–fosfatnih prevlaka je određen primenom energetske disperzione atomske analize (EDS) i difrakcijom H-zraka (XRD), dok je pokrivenost površine određivana anodnim rastvaranjem u boratnom rastvoru primenom linearne voltametrije (VAD). Pokazano je da dodatak NaNO2 u rastvoru za fosfatiranje značajno povećava pokrivenost površine čelika, jer se formiraju bolje pakovani kristali, manje veličine. Duže vreme taloženja takođe povećava pokrivenost površine, kao i hrapavost prevlake i širinu kristala. Oblik kristala se tokom dužeg vremena taloženja menja od kristala u obliku većih ploča neuniformno raspoređenih na površini čelika, ka bolje pakovanim laminarnim i igličastim kristalima.
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Determination of surface coverage of iron-phosphate coatings on steel using the voltammetric anodic dissolution technique
T1  - Određivanje pokrivenosti površine čelika gvožđe-fosfatnim prevlakama anodnim rastvaranjem primenom linearne voltametrije
VL  - 78
IS  - 1
SP  - 101
EP  - 114
DO  - 10.2298/JSC120706096P
ER  - 

@article{
author = "Popić, Jovan P. and Jegdić, Bore and Bajat, Jelena and Mitrić, Miodrag and Mišković-Stanković, Vesna",
year = "2013",
abstract = "In this study, the effect of deposition time and concentration of NaNO2 in the phosphate bath on the surface morphology of iron-phosphate coatings on low carbon steel was investigated using scanning electron microscopy (SEM) and atomic force microscopy (AFM). The composition of ironphosphate coatings was determined using energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD), while surface coverage was evaluated by the voltammetric anodic dissolution (VAD) technique in the borate solution. The addition of NaNO2 to the phosphate bath significantly increased the surface coverage since better packed crystals of smaller size, which favour the phosphate nucleation, were obtained. It was also shown that prolonged deposition time increased the surface coverage, coating roughness and crystal size in the lateral direction, altering also the crystal shape from large platelets non-uniformly distributed on the steel surface during the initial time to better packed laminated and needle-like structures during prolonged exposure., U ovom radu je, primenom skenirajuće elektronske mikroskopije (SEM) i mikro- skopije međuatomskih sila (AFM), ispitivan uticaj vremena taloženja i koncentracije NaNO2 u rastvoru za fosfatiranje na morfologiju gvožđe-fosfatnih prevlaka na nisko-ugljeničnom čeliku. Sastav gvožđe–fosfatnih prevlaka je određen primenom energetske disperzione atomske analize (EDS) i difrakcijom H-zraka (XRD), dok je pokrivenost površine određivana anodnim rastvaranjem u boratnom rastvoru primenom linearne voltametrije (VAD). Pokazano je da dodatak NaNO2 u rastvoru za fosfatiranje značajno povećava pokrivenost površine čelika, jer se formiraju bolje pakovani kristali, manje veličine. Duže vreme taloženja takođe povećava pokrivenost površine, kao i hrapavost prevlake i širinu kristala. Oblik kristala se tokom dužeg vremena taloženja menja od kristala u obliku većih ploča neuniformno raspoređenih na površini čelika, ka bolje pakovanim laminarnim i igličastim kristalima.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Determination of surface coverage of iron-phosphate coatings on steel using the voltammetric anodic dissolution technique, Određivanje pokrivenosti površine čelika gvožđe-fosfatnim prevlakama anodnim rastvaranjem primenom linearne voltametrije",
volume = "78",
number = "1",
pages = "101-114",
doi = "10.2298/JSC120706096P"
}

Popić, J. P., Jegdić, B., Bajat, J., Mitrić, M.,& Mišković-Stanković, V.. (2013). Determination of surface coverage of iron-phosphate coatings on steel using the voltammetric anodic dissolution technique. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 78(1), 101-114.
https://doi.org/10.2298/JSC120706096P

Popić JP, Jegdić B, Bajat J, Mitrić M, Mišković-Stanković V. Determination of surface coverage of iron-phosphate coatings on steel using the voltammetric anodic dissolution technique. in Journal of the Serbian Chemical Society. 2013;78(1):101-114.
doi:10.2298/JSC120706096P .

Popić, Jovan P., Jegdić, Bore, Bajat, Jelena, Mitrić, Miodrag, Mišković-Stanković, Vesna, "Determination of surface coverage of iron-phosphate coatings on steel using the voltammetric anodic dissolution technique" in Journal of the Serbian Chemical Society, 78, no. 1 (2013):101-114,
https://doi.org/10.2298/JSC120706096P . .

TY  - JOUR
AU  - Popić, Jovan P.
AU  - Jegdić, Bore
AU  - Bajat, Jelena
AU  - Veljović, Đorđe
AU  - Stevanović, Sanja
AU  - Mišković-Stanković, Vesna
PY  - 2011
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/847
AB  - The influence of deposition temperature and concentration of NaNO(2) in the phosphating bath on the surface morphology and coverage of iron-phosphate coatings on low carbon steel was investigated. The phosphate coatings were chemically deposited on steel from phosphate bath at different temperatures (30-70 degrees C) and with the addition of different amounts of accelerator, NaNO(2) (0.1, 0.5 and 1.0 g dm(-3)). The morphology of phosphate coatings was investigated using scanning electron microscopy (SEM) and atomic force microscopy (AFM). The composition of iron-phosphate coatings was determined using energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD). Surface coverage was evaluated by the voltammetric anodic dissolution (VAD) technique. It was shown that the increase in temperature of the NaNO(2)-free phosphating bath up to 70 degrees C caused an increase in surface coverage. The addition of NaNO(2) in the phosphating bath significantly increased the surface coverage of phosphate coatings deposited at temperatures lower than 50 degrees C. The phosphate crystals were of laminated and needle-like structures for deposits obtained at temperatures lower than 50 degrees C, while at higher temperatures needle-like structure was transformed to laminated structure. The increase in NaNO(2) concentration in the phosphating bath from 0.1 to 1.0 g dm(-3) did not significantly increase the surface coverage, but decreased the crystals size, consequently favouring the phosphate nucleation and better packing of the crystals.
PB  - Elsevier
T2  - Applied Surface Science
T1  - The effect of deposition temperature on the surface coverage and morphology of iron-phosphate coatings on low carbon steel
VL  - 257
IS  - 24
SP  - 10855
EP  - 10862
DO  - 10.1016/j.apsusc.2011.07.122
ER  - 

@article{
author = "Popić, Jovan P. and Jegdić, Bore and Bajat, Jelena and Veljović, Đorđe and Stevanović, Sanja and Mišković-Stanković, Vesna",
year = "2011",
abstract = "The influence of deposition temperature and concentration of NaNO(2) in the phosphating bath on the surface morphology and coverage of iron-phosphate coatings on low carbon steel was investigated. The phosphate coatings were chemically deposited on steel from phosphate bath at different temperatures (30-70 degrees C) and with the addition of different amounts of accelerator, NaNO(2) (0.1, 0.5 and 1.0 g dm(-3)). The morphology of phosphate coatings was investigated using scanning electron microscopy (SEM) and atomic force microscopy (AFM). The composition of iron-phosphate coatings was determined using energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD). Surface coverage was evaluated by the voltammetric anodic dissolution (VAD) technique. It was shown that the increase in temperature of the NaNO(2)-free phosphating bath up to 70 degrees C caused an increase in surface coverage. The addition of NaNO(2) in the phosphating bath significantly increased the surface coverage of phosphate coatings deposited at temperatures lower than 50 degrees C. The phosphate crystals were of laminated and needle-like structures for deposits obtained at temperatures lower than 50 degrees C, while at higher temperatures needle-like structure was transformed to laminated structure. The increase in NaNO(2) concentration in the phosphating bath from 0.1 to 1.0 g dm(-3) did not significantly increase the surface coverage, but decreased the crystals size, consequently favouring the phosphate nucleation and better packing of the crystals.",
publisher = "Elsevier",
journal = "Applied Surface Science",
title = "The effect of deposition temperature on the surface coverage and morphology of iron-phosphate coatings on low carbon steel",
volume = "257",
number = "24",
pages = "10855-10862",
doi = "10.1016/j.apsusc.2011.07.122"
}

Popić, J. P., Jegdić, B., Bajat, J., Veljović, Đ., Stevanović, S.,& Mišković-Stanković, V.. (2011). The effect of deposition temperature on the surface coverage and morphology of iron-phosphate coatings on low carbon steel. in Applied Surface Science
Elsevier., 257(24), 10855-10862.
https://doi.org/10.1016/j.apsusc.2011.07.122

Popić JP, Jegdić B, Bajat J, Veljović Đ, Stevanović S, Mišković-Stanković V. The effect of deposition temperature on the surface coverage and morphology of iron-phosphate coatings on low carbon steel. in Applied Surface Science. 2011;257(24):10855-10862.
doi:10.1016/j.apsusc.2011.07.122 .

Popić, Jovan P., Jegdić, Bore, Bajat, Jelena, Veljović, Đorđe, Stevanović, Sanja, Mišković-Stanković, Vesna, "The effect of deposition temperature on the surface coverage and morphology of iron-phosphate coatings on low carbon steel" in Applied Surface Science, 257, no. 24 (2011):10855-10862,
https://doi.org/10.1016/j.apsusc.2011.07.122 . .

TY  - JOUR
AU  - Jegdić, Bore
AU  - Bajat, Jelena
AU  - Popić, Jovan P.
AU  - Mišković-Stanković, Vesna
PY  - 2011
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/902
AB  - The influence of steel surface pretreatment with different types of iron-phosphate coatings on the corrosion stability and adhesion characteristics of polyester coatings on steel was investigated. The phosphate coating was chemically deposited either from the simple novel plating bath, or with the addition of NaNO(2), as an accelerator in the plating bath. The morphology of phosphate coatings was investigated using atomic force microscopy (AFM). The corrosion stability of polyester coatings on steel pretreated by iron-phosphate coatings was investigated by electrochemical impedance spectroscopy (EIS) in 3% NaCl solution, while "dry" and "wet" adhesion were measured by a direct pull-off standardized procedure. It was shown that greater values of pore resistance. R(p), and smaller values of coating capacitance of polyester coating, C(c), on steel pretreated with iron-phosphate coating were obtained, as compared to polyester coating on steel phosphated with accelerator, and on the bare steel. The surface roughness of phosphate coating deposited on steel from the bath without accelerator is favorable in forming stronger bonds with polyester coating. Namely, the dry and wet adhesion measurements are in accordance with EIS measurements in 3% NaCl solution, i.e. lower adhesion values were obtained for polyester coating on steel phosphated with accelerator and on the bare steel, while the iron-phosphate pretreatment from the novel bath enhanced the adhesion of polyester coating on steel.
PB  - Elsevier Science Sa, Lausanne
T2  - Progress in Organic Coatings
T1  - Corrosion stability of polyester coatings on steel pretreated with different iron-phosphate coatings
VL  - 70
IS  - 2-3
SP  - 127
EP  - 133
DO  - 10.1016/j.porgcoat.2010.11.004
ER  - 

@article{
author = "Jegdić, Bore and Bajat, Jelena and Popić, Jovan P. and Mišković-Stanković, Vesna",
year = "2011",
abstract = "The influence of steel surface pretreatment with different types of iron-phosphate coatings on the corrosion stability and adhesion characteristics of polyester coatings on steel was investigated. The phosphate coating was chemically deposited either from the simple novel plating bath, or with the addition of NaNO(2), as an accelerator in the plating bath. The morphology of phosphate coatings was investigated using atomic force microscopy (AFM). The corrosion stability of polyester coatings on steel pretreated by iron-phosphate coatings was investigated by electrochemical impedance spectroscopy (EIS) in 3% NaCl solution, while "dry" and "wet" adhesion were measured by a direct pull-off standardized procedure. It was shown that greater values of pore resistance. R(p), and smaller values of coating capacitance of polyester coating, C(c), on steel pretreated with iron-phosphate coating were obtained, as compared to polyester coating on steel phosphated with accelerator, and on the bare steel. The surface roughness of phosphate coating deposited on steel from the bath without accelerator is favorable in forming stronger bonds with polyester coating. Namely, the dry and wet adhesion measurements are in accordance with EIS measurements in 3% NaCl solution, i.e. lower adhesion values were obtained for polyester coating on steel phosphated with accelerator and on the bare steel, while the iron-phosphate pretreatment from the novel bath enhanced the adhesion of polyester coating on steel.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Progress in Organic Coatings",
title = "Corrosion stability of polyester coatings on steel pretreated with different iron-phosphate coatings",
volume = "70",
number = "2-3",
pages = "127-133",
doi = "10.1016/j.porgcoat.2010.11.004"
}

Jegdić, B., Bajat, J., Popić, J. P.,& Mišković-Stanković, V.. (2011). Corrosion stability of polyester coatings on steel pretreated with different iron-phosphate coatings. in Progress in Organic Coatings
Elsevier Science Sa, Lausanne., 70(2-3), 127-133.
https://doi.org/10.1016/j.porgcoat.2010.11.004

Jegdić B, Bajat J, Popić JP, Mišković-Stanković V. Corrosion stability of polyester coatings on steel pretreated with different iron-phosphate coatings. in Progress in Organic Coatings. 2011;70(2-3):127-133.
doi:10.1016/j.porgcoat.2010.11.004 .

Jegdić, Bore, Bajat, Jelena, Popić, Jovan P., Mišković-Stanković, Vesna, "Corrosion stability of polyester coatings on steel pretreated with different iron-phosphate coatings" in Progress in Organic Coatings, 70, no. 2-3 (2011):127-133,
https://doi.org/10.1016/j.porgcoat.2010.11.004 . .

TY  - JOUR
AU  - Jegdić, Bore
AU  - Bajat, Jelena
AU  - Popić, Jovan P.
AU  - Stevanović, Sanja
AU  - Mišković-Stanković, Vesna
PY  - 2011
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/776
AB  - The effect of different type of iron-phosphate coatings on corrosion stability and adhesion characteristic of top powder polyester coating on steel was investigated. Iron-phosphate coatings were deposited on steel in the novel phosphating bath with or without NaNO2 as an accelerator. The corrosion stability of the powder polyester coating was evaluated by electrochemical impedance spectroscopy (EIS), adhesion by pull-off and NMP test, while surface morphology of phosphate coatings were investigated by atomic force microscopy (AFM). The adhesion and corrosion stability of powder polyester coatings were improved with pretreatment based on iron-phosphate coating deposited from NaNO2-free bath.
PB  - Oxford : Pergamon-Elsevier Science Ltd
T2  - Corrosion Science
T1  - The EIS investigation of powder polyester coatings on phosphated low carbon steel: The effect of NaNO2 in the phosphating bath
VL  - 53
IS  - 9
SP  - 2872
EP  - 2880
DO  - 10.1016/j.corsci.2011.05.019
ER  - 

@article{
author = "Jegdić, Bore and Bajat, Jelena and Popić, Jovan P. and Stevanović, Sanja and Mišković-Stanković, Vesna",
year = "2011",
abstract = "The effect of different type of iron-phosphate coatings on corrosion stability and adhesion characteristic of top powder polyester coating on steel was investigated. Iron-phosphate coatings were deposited on steel in the novel phosphating bath with or without NaNO2 as an accelerator. The corrosion stability of the powder polyester coating was evaluated by electrochemical impedance spectroscopy (EIS), adhesion by pull-off and NMP test, while surface morphology of phosphate coatings were investigated by atomic force microscopy (AFM). The adhesion and corrosion stability of powder polyester coatings were improved with pretreatment based on iron-phosphate coating deposited from NaNO2-free bath.",
publisher = "Oxford : Pergamon-Elsevier Science Ltd",
journal = "Corrosion Science",
title = "The EIS investigation of powder polyester coatings on phosphated low carbon steel: The effect of NaNO2 in the phosphating bath",
volume = "53",
number = "9",
pages = "2872-2880",
doi = "10.1016/j.corsci.2011.05.019"
}

Jegdić, B., Bajat, J., Popić, J. P., Stevanović, S.,& Mišković-Stanković, V.. (2011). The EIS investigation of powder polyester coatings on phosphated low carbon steel: The effect of NaNO2 in the phosphating bath. in Corrosion Science
Oxford : Pergamon-Elsevier Science Ltd., 53(9), 2872-2880.
https://doi.org/10.1016/j.corsci.2011.05.019

Jegdić B, Bajat J, Popić JP, Stevanović S, Mišković-Stanković V. The EIS investigation of powder polyester coatings on phosphated low carbon steel: The effect of NaNO2 in the phosphating bath. in Corrosion Science. 2011;53(9):2872-2880.
doi:10.1016/j.corsci.2011.05.019 .

Jegdić, Bore, Bajat, Jelena, Popić, Jovan P., Stevanović, Sanja, Mišković-Stanković, Vesna, "The EIS investigation of powder polyester coatings on phosphated low carbon steel: The effect of NaNO2 in the phosphating bath" in Corrosion Science, 53, no. 9 (2011):2872-2880,
https://doi.org/10.1016/j.corsci.2011.05.019 . .

TY  - JOUR
AU  - Bajat, Jelena
AU  - Popić, Jovan P.
AU  - Mišković-Stanković, Vesna
PY  - 2010
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3171
AB  - One of the most important factors in corrosion prevention by protective coatings is the coating adhesion loss under environmental influence. Thus, adhesion strength is often used when characterizing protective properties of organic coatings on a metal substrate. In order to improve the adhesion of organic coating the metal substrate is often pretreated in some way. In this work, the adhesion of polyester coatings on differently pretreated aluminium surface (by anodizing, with and without sealing, by phosphating and by silane film deposition) was examined. The dry and wet adhesion of polyester coatings were measured by a direct pull-off standardized procedure, as well as indirectly by NMP test. It was shown that under dry test conditions all polyester coatings showed very good adhesion, but that aluminium surface pretreated by silane film showed superior adhesion. The overall increase of wet adhesion for polyester coating on aluminium pretreated by silane film was maintained throughout the whole investigated time period. The different trends in the change of adhesion of polyester coatings were observed for different aluminium pretreatments during exposure to the corrosive agent (3% NaCl solution). The highest adhesion reduction was obtained for polyester coating on aluminium pretreated with phosphate coating. The corrosion stability of polyester coated aluminium was investigated by electrochemical impedance spectroscopy in 3% NaCl solution. The results confirmed good protective properties of polyester coating on aluminium pretreated with silane film, i.e. greater values of pore resistance and smaller values of coating capacitance were obtained in respect to other protective systems, whereas charge-transfer resistance and double-layer capacitance were not measurable during 2 months of exposure to a corrosive agent.
PB  - Elsevier
T2  - Progress in Organic Coatings
T1  - The influence of aluminium surface pretreatment on the corrosion stability and adhesion of powder polyester coating
VL  - 69
IS  - 4
SP  - 316
EP  - 321
DO  - 10.1016/j.porgcoat.2010.07.004
ER  - 

@article{
author = "Bajat, Jelena and Popić, Jovan P. and Mišković-Stanković, Vesna",
year = "2010",
abstract = "One of the most important factors in corrosion prevention by protective coatings is the coating adhesion loss under environmental influence. Thus, adhesion strength is often used when characterizing protective properties of organic coatings on a metal substrate. In order to improve the adhesion of organic coating the metal substrate is often pretreated in some way. In this work, the adhesion of polyester coatings on differently pretreated aluminium surface (by anodizing, with and without sealing, by phosphating and by silane film deposition) was examined. The dry and wet adhesion of polyester coatings were measured by a direct pull-off standardized procedure, as well as indirectly by NMP test. It was shown that under dry test conditions all polyester coatings showed very good adhesion, but that aluminium surface pretreated by silane film showed superior adhesion. The overall increase of wet adhesion for polyester coating on aluminium pretreated by silane film was maintained throughout the whole investigated time period. The different trends in the change of adhesion of polyester coatings were observed for different aluminium pretreatments during exposure to the corrosive agent (3% NaCl solution). The highest adhesion reduction was obtained for polyester coating on aluminium pretreated with phosphate coating. The corrosion stability of polyester coated aluminium was investigated by electrochemical impedance spectroscopy in 3% NaCl solution. The results confirmed good protective properties of polyester coating on aluminium pretreated with silane film, i.e. greater values of pore resistance and smaller values of coating capacitance were obtained in respect to other protective systems, whereas charge-transfer resistance and double-layer capacitance were not measurable during 2 months of exposure to a corrosive agent.",
publisher = "Elsevier",
journal = "Progress in Organic Coatings",
title = "The influence of aluminium surface pretreatment on the corrosion stability and adhesion of powder polyester coating",
volume = "69",
number = "4",
pages = "316-321",
doi = "10.1016/j.porgcoat.2010.07.004"
}

Bajat, J., Popić, J. P.,& Mišković-Stanković, V.. (2010). The influence of aluminium surface pretreatment on the corrosion stability and adhesion of powder polyester coating. in Progress in Organic Coatings
Elsevier., 69(4), 316-321.
https://doi.org/10.1016/j.porgcoat.2010.07.004

Bajat J, Popić JP, Mišković-Stanković V. The influence of aluminium surface pretreatment on the corrosion stability and adhesion of powder polyester coating. in Progress in Organic Coatings. 2010;69(4):316-321.
doi:10.1016/j.porgcoat.2010.07.004 .

Bajat, Jelena, Popić, Jovan P., Mišković-Stanković, Vesna, "The influence of aluminium surface pretreatment on the corrosion stability and adhesion of powder polyester coating" in Progress in Organic Coatings, 69, no. 4 (2010):316-321,
https://doi.org/10.1016/j.porgcoat.2010.07.004 . .

TY  - CONF
AU  - Popić, Jovan P.
AU  - Jegdić, Bore
AU  - Bajat, Jelena
AU  - Mišković-Stanković, Vesna
PY  - 2010
UR  - http://www.aseee.eu/index.php/rsesee2-home
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3534
AB  - The iron phosphate layers on the low carbon steel surface slows steel corrosion in aggressive environments. The quality of the iron phosphate layer depends on the fraction of the total surface area covered by phosphate coating. Various factors affect this coverage fraction, in particular the composition of the deposition bath, bath temperature and additives used in the electrolyte. In this study phosphating was carried in the phosphate solution (NaOH + H3PO4 + NaNO2, pH 3.8) at different temperatures (30-70oC). The porosity of phosphate coatings on low carbon steel was determined using VAD technique in the borate solution. Surface morphology of the steel was studied using SEM and AFM technique. Anodic polarization showed that phosphate coatings formed on the steel surface resulted in the decrease of the steel dissolution rate. This effect of the phosphate coatings was more pronounced for coatings deposited at higher temperatures of phosphate solution. The decrease in the steel dissolution rate is caused by the decrease of coating porosity. The addition of NaNO2 in the phosphate solution significantly decreased phosphate coating porosity. The lowest porosity of phosphate coating (35.1%), for deposition time of 5 min, was obtained with 1.0 g dm-3 NaNO2 in the phosphate solution, at 50oC. The study of the phosphate coatings morphology showed that coating was evenly dispersed on the whole steel surface. There were two characteristic forms of phosphates present: laminated structure with needle-like forms. The average concentration of specific elements in the phosphate coatings were: oxygen 37.6%, phosphor 3.26% and iron 59.14%.
PB  - Serbian Chemical Society, Belgrade
C3  - Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Program and Book of Abstracts
T1  - The study of the iron phosphate coatings porosity in bufered borate solution
SP  - 39
EP  - 39
UR  - https://hdl.handle.net/21.15107/rcub_cer_3534
ER  - 

@conference{
author = "Popić, Jovan P. and Jegdić, Bore and Bajat, Jelena and Mišković-Stanković, Vesna",
year = "2010",
abstract = "The iron phosphate layers on the low carbon steel surface slows steel corrosion in aggressive environments. The quality of the iron phosphate layer depends on the fraction of the total surface area covered by phosphate coating. Various factors affect this coverage fraction, in particular the composition of the deposition bath, bath temperature and additives used in the electrolyte. In this study phosphating was carried in the phosphate solution (NaOH + H3PO4 + NaNO2, pH 3.8) at different temperatures (30-70oC). The porosity of phosphate coatings on low carbon steel was determined using VAD technique in the borate solution. Surface morphology of the steel was studied using SEM and AFM technique. Anodic polarization showed that phosphate coatings formed on the steel surface resulted in the decrease of the steel dissolution rate. This effect of the phosphate coatings was more pronounced for coatings deposited at higher temperatures of phosphate solution. The decrease in the steel dissolution rate is caused by the decrease of coating porosity. The addition of NaNO2 in the phosphate solution significantly decreased phosphate coating porosity. The lowest porosity of phosphate coating (35.1%), for deposition time of 5 min, was obtained with 1.0 g dm-3 NaNO2 in the phosphate solution, at 50oC. The study of the phosphate coatings morphology showed that coating was evenly dispersed on the whole steel surface. There were two characteristic forms of phosphates present: laminated structure with needle-like forms. The average concentration of specific elements in the phosphate coatings were: oxygen 37.6%, phosphor 3.26% and iron 59.14%.",
publisher = "Serbian Chemical Society, Belgrade",
journal = "Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Program and Book of Abstracts",
title = "The study of the iron phosphate coatings porosity in bufered borate solution",
pages = "39-39",
url = "https://hdl.handle.net/21.15107/rcub_cer_3534"
}

Popić, J. P., Jegdić, B., Bajat, J.,& Mišković-Stanković, V.. (2010). The study of the iron phosphate coatings porosity in bufered borate solution. in Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Program and Book of Abstracts
Serbian Chemical Society, Belgrade., 39-39.
https://hdl.handle.net/21.15107/rcub_cer_3534

Popić JP, Jegdić B, Bajat J, Mišković-Stanković V. The study of the iron phosphate coatings porosity in bufered borate solution. in Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Program and Book of Abstracts. 2010;:39-39.
https://hdl.handle.net/21.15107/rcub_cer_3534 .

Popić, Jovan P., Jegdić, Bore, Bajat, Jelena, Mišković-Stanković, Vesna, "The study of the iron phosphate coatings porosity in bufered borate solution" in Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Program and Book of Abstracts (2010):39-39,
https://hdl.handle.net/21.15107/rcub_cer_3534 .

TY  - CONF
AU  - Popić, Jovan P.
AU  - Jegdić, Bore
AU  - Bajat, Jelena
AU  - Mišković-Stanković, Vesna
PY  - 2010
UR  - http://www.aseee.eu/index.php/rsesee2-home
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3535
AB  - The iron phosphate layers on the low carbon steel surface slows steel corrosion in aggressive environments. The quality of the iron phosphate layer depends on the fraction of the total surface area covered by phosphate coating. Various factors affect this coverage fraction, in particular the composition of the deposition bath, bath temperature and additives used in the electrolyte. In this study phosphating was carried in the phosphate solution (NaOH + H3PO4 + NaNO2, pH 3.8) at different temperatures (30-70oC). The porosity of phosphate coatings on low carbon steel was determined using VAD technique in the borate solution. Surface morphology of the steel was studied using SEM and AFM technique. Anodic polarization showed that phosphate coatings formed on the steel surface resulted in the decrease of the steel dissolution rate. This effect of the phosphate coatings was more pronounced for coatings deposited at higher temperatures of phosphate solution. The decrease in the steel dissolution rate is caused by the decrease of coating porosity. The addition of NaNO2 in the phosphate solution significantly decreased phosphate coating porosity. The lowest porosity of phosphate coating (35.1%), for deposition time of 5 min, was obtained with 1.0 g dm-3 NaNO2 in the phosphate solution, at 50oC. The study of the phosphate coatings morphology showed that coating was evenly dispersed on the whole steel surface. There were two characteristic forms of phosphates present: laminated structure with needle-like forms. The average concentration of specific elements in the phosphate coatings were: oxygen 37.6%, phosphor 3.26% and iron 59.14%.
PB  - Serbian Chemical Society, Belgrade
C3  - Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Proceedings
T1  - The study of the iron phosphate coatings porosity in bufered borate solution
SP  - 46
EP  - 49
UR  - https://hdl.handle.net/21.15107/rcub_cer_3535
ER  - 

@conference{
author = "Popić, Jovan P. and Jegdić, Bore and Bajat, Jelena and Mišković-Stanković, Vesna",
year = "2010",
abstract = "The iron phosphate layers on the low carbon steel surface slows steel corrosion in aggressive environments. The quality of the iron phosphate layer depends on the fraction of the total surface area covered by phosphate coating. Various factors affect this coverage fraction, in particular the composition of the deposition bath, bath temperature and additives used in the electrolyte. In this study phosphating was carried in the phosphate solution (NaOH + H3PO4 + NaNO2, pH 3.8) at different temperatures (30-70oC). The porosity of phosphate coatings on low carbon steel was determined using VAD technique in the borate solution. Surface morphology of the steel was studied using SEM and AFM technique. Anodic polarization showed that phosphate coatings formed on the steel surface resulted in the decrease of the steel dissolution rate. This effect of the phosphate coatings was more pronounced for coatings deposited at higher temperatures of phosphate solution. The decrease in the steel dissolution rate is caused by the decrease of coating porosity. The addition of NaNO2 in the phosphate solution significantly decreased phosphate coating porosity. The lowest porosity of phosphate coating (35.1%), for deposition time of 5 min, was obtained with 1.0 g dm-3 NaNO2 in the phosphate solution, at 50oC. The study of the phosphate coatings morphology showed that coating was evenly dispersed on the whole steel surface. There were two characteristic forms of phosphates present: laminated structure with needle-like forms. The average concentration of specific elements in the phosphate coatings were: oxygen 37.6%, phosphor 3.26% and iron 59.14%.",
publisher = "Serbian Chemical Society, Belgrade",
journal = "Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Proceedings",
title = "The study of the iron phosphate coatings porosity in bufered borate solution",
pages = "46-49",
url = "https://hdl.handle.net/21.15107/rcub_cer_3535"
}

Popić, J. P., Jegdić, B., Bajat, J.,& Mišković-Stanković, V.. (2010). The study of the iron phosphate coatings porosity in bufered borate solution. in Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Proceedings
Serbian Chemical Society, Belgrade., 46-49.
https://hdl.handle.net/21.15107/rcub_cer_3535

Popić JP, Jegdić B, Bajat J, Mišković-Stanković V. The study of the iron phosphate coatings porosity in bufered borate solution. in Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Proceedings. 2010;:46-49.
https://hdl.handle.net/21.15107/rcub_cer_3535 .

Popić, Jovan P., Jegdić, Bore, Bajat, Jelena, Mišković-Stanković, Vesna, "The study of the iron phosphate coatings porosity in bufered borate solution" in Second Regional Symposium on Electrochemistry South-East Europe, RSE-SEE, Proceedings (2010):46-49,
https://hdl.handle.net/21.15107/rcub_cer_3535 .

TY  - JOUR
AU  - Bajat, Jelena
AU  - Mišković-Stanković, Vesna
AU  - Popić, Jovan
AU  - Dražić, Dragutin M.
PY  - 2008
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4117
AB  - The influence of hot-dip galvanized steel (HDG) surface pretreatment with phosphate coatings on the corrosion stability and adhesion characteristics of epoxy coatings electrodeposited on HDG steel was investigated. Phosphate coatings were deposited on hot-dip galvanized steel from baths with different concentrations of NaF (0.1, 0.5 and 1.0 g dm-3) and at different temperatures (50, 65 and 80 °C). The influence of fluoride ion concentration in the phosphating bath, as well as the deposition temperature of the bath, on the adhesion characteristics and corrosion stability of epoxy coatings on phosphated HDG steel was investigated. The dry and wet adhesions were measured by a direct pull-off standardized procedure, as well as indirectly by NMP test, while corrosion stability was investigated by electrochemical impedance spectroscopy (EIS). It was shown that under dry testing conditions all the samples exhibited very good adhesion. However, the different trends of adhesion loss of different protective systems during exposure to corrosive agent (3% NaCl solution) were observed. The lowest adhesion values were obtained for epoxy coating on hot-dip galvanized steel, while the phosphate pretreatments significantly increase the adhesion of epoxy coatings. The highest values of adhesion strength were obtained for epoxy coating on HDG steel modified by phosphate coating deposited at 65 °C with 0.5 g dm-3 NaF in the phosphating bath. EIS measurements in 3% NaCl solution are in accordance with adhesion measurements, i.e. greater values of charge-transfer resistance and smaller values of double-layer capacitance were obtained, as compared to other protective systems.
PB  - Elsevier
T2  - Progress in Organic Coatings
T1  - Adhesion characteristics and corrosion stability of epoxy coatings electrodeposited on phosphated hot-dip galvanized steel
VL  - 63
IS  - 2
SP  - 201
EP  - 208
DO  - 10.1016/j.porgcoat.2008.06.002
ER  - 

@article{
author = "Bajat, Jelena and Mišković-Stanković, Vesna and Popić, Jovan and Dražić, Dragutin M.",
year = "2008",
abstract = "The influence of hot-dip galvanized steel (HDG) surface pretreatment with phosphate coatings on the corrosion stability and adhesion characteristics of epoxy coatings electrodeposited on HDG steel was investigated. Phosphate coatings were deposited on hot-dip galvanized steel from baths with different concentrations of NaF (0.1, 0.5 and 1.0 g dm-3) and at different temperatures (50, 65 and 80 °C). The influence of fluoride ion concentration in the phosphating bath, as well as the deposition temperature of the bath, on the adhesion characteristics and corrosion stability of epoxy coatings on phosphated HDG steel was investigated. The dry and wet adhesions were measured by a direct pull-off standardized procedure, as well as indirectly by NMP test, while corrosion stability was investigated by electrochemical impedance spectroscopy (EIS). It was shown that under dry testing conditions all the samples exhibited very good adhesion. However, the different trends of adhesion loss of different protective systems during exposure to corrosive agent (3% NaCl solution) were observed. The lowest adhesion values were obtained for epoxy coating on hot-dip galvanized steel, while the phosphate pretreatments significantly increase the adhesion of epoxy coatings. The highest values of adhesion strength were obtained for epoxy coating on HDG steel modified by phosphate coating deposited at 65 °C with 0.5 g dm-3 NaF in the phosphating bath. EIS measurements in 3% NaCl solution are in accordance with adhesion measurements, i.e. greater values of charge-transfer resistance and smaller values of double-layer capacitance were obtained, as compared to other protective systems.",
publisher = "Elsevier",
journal = "Progress in Organic Coatings",
title = "Adhesion characteristics and corrosion stability of epoxy coatings electrodeposited on phosphated hot-dip galvanized steel",
volume = "63",
number = "2",
pages = "201-208",
doi = "10.1016/j.porgcoat.2008.06.002"
}

Bajat, J., Mišković-Stanković, V., Popić, J.,& Dražić, D. M.. (2008). Adhesion characteristics and corrosion stability of epoxy coatings electrodeposited on phosphated hot-dip galvanized steel. in Progress in Organic Coatings
Elsevier., 63(2), 201-208.
https://doi.org/10.1016/j.porgcoat.2008.06.002

Bajat J, Mišković-Stanković V, Popić J, Dražić DM. Adhesion characteristics and corrosion stability of epoxy coatings electrodeposited on phosphated hot-dip galvanized steel. in Progress in Organic Coatings. 2008;63(2):201-208.
doi:10.1016/j.porgcoat.2008.06.002 .

Bajat, Jelena, Mišković-Stanković, Vesna, Popić, Jovan, Dražić, Dragutin M., "Adhesion characteristics and corrosion stability of epoxy coatings electrodeposited on phosphated hot-dip galvanized steel" in Progress in Organic Coatings, 63, no. 2 (2008):201-208,
https://doi.org/10.1016/j.porgcoat.2008.06.002 . .

TY  - JOUR
AU  - Stevanović, Jasmina
AU  - Jugović, Branimir
AU  - Popić, Jovan P.
AU  - Stajić-Trošić, Jasna
AU  - Talijan, Nadežda M.
PY  - 2008
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/428
UR  - https://scindeks.ceon.rs/article.aspx?artid=0351-94650802025S
AB  - The electro deposition of the Co-Ni-Mo-O alloy powders from alkaline ammonium electrolytes and at constant current density was investigated. Metals of iron group, Co and Ni induce deposition of Mo, which alone can not be deposited from water electrolytes. Electrodeposited powders were investigated by SEM analysis where it is possible to determine the particle size, as well as the morphology of powders. The quantitative mass and chemical composition of Co-Ni-Mo-O alloy powders was determined by EDX analysis.
AB  - Alkalni, amonijačni elektrolit je korišćen za dobijanje prahova Co-Ni-Mo-O legure. Prahovi su taloženi pri konstantnoj gustini struje, kao sporedna reakcija pri reakciji intenzivnog izdvajanja vodonika. Metali grupe gvožđa Co i Ni indukuju taloženje Mo, koji sam ne može da se taloži iz vodenih elektrolita. Dobijeni prahovi su ispitani EDX, X-ray i SEM analizom i na osnovu dobijenih rezultata može se zaključiti da se promenom odnosa koncentracija soli u elektrolitu za taloženje, kao i gustinom struje taloženja može uticati na hemijski sastav i veličinu čestica prahova Co-Ni-Mo-O legure. Rezultati rendgenske analize ukazuju na amorfnu strukturu dobijenih prahova.
PB  - Belgrade, Serbia : Engineering Society for Corrosion
T2  - Zaštita materijala
T1  - Electrochemical deposition of powder alloy Co-Ni-Mo-O
T1  - Elektrohemijsko dobijanje prahova legure Co-Ni-Mo-O
VL  - 49
IS  - 2
SP  - 25
EP  - 30
UR  - https://hdl.handle.net/21.15107/rcub_cer_428
ER  - 

@article{
author = "Stevanović, Jasmina and Jugović, Branimir and Popić, Jovan P. and Stajić-Trošić, Jasna and Talijan, Nadežda M.",
year = "2008",
abstract = "The electro deposition of the Co-Ni-Mo-O alloy powders from alkaline ammonium electrolytes and at constant current density was investigated. Metals of iron group, Co and Ni induce deposition of Mo, which alone can not be deposited from water electrolytes. Electrodeposited powders were investigated by SEM analysis where it is possible to determine the particle size, as well as the morphology of powders. The quantitative mass and chemical composition of Co-Ni-Mo-O alloy powders was determined by EDX analysis., Alkalni, amonijačni elektrolit je korišćen za dobijanje prahova Co-Ni-Mo-O legure. Prahovi su taloženi pri konstantnoj gustini struje, kao sporedna reakcija pri reakciji intenzivnog izdvajanja vodonika. Metali grupe gvožđa Co i Ni indukuju taloženje Mo, koji sam ne može da se taloži iz vodenih elektrolita. Dobijeni prahovi su ispitani EDX, X-ray i SEM analizom i na osnovu dobijenih rezultata može se zaključiti da se promenom odnosa koncentracija soli u elektrolitu za taloženje, kao i gustinom struje taloženja može uticati na hemijski sastav i veličinu čestica prahova Co-Ni-Mo-O legure. Rezultati rendgenske analize ukazuju na amorfnu strukturu dobijenih prahova.",
publisher = "Belgrade, Serbia : Engineering Society for Corrosion",
journal = "Zaštita materijala",
title = "Electrochemical deposition of powder alloy Co-Ni-Mo-O, Elektrohemijsko dobijanje prahova legure Co-Ni-Mo-O",
volume = "49",
number = "2",
pages = "25-30",
url = "https://hdl.handle.net/21.15107/rcub_cer_428"
}

Stevanović, J., Jugović, B., Popić, J. P., Stajić-Trošić, J.,& Talijan, N. M.. (2008). Electrochemical deposition of powder alloy Co-Ni-Mo-O. in Zaštita materijala
Belgrade, Serbia : Engineering Society for Corrosion., 49(2), 25-30.
https://hdl.handle.net/21.15107/rcub_cer_428

Stevanović J, Jugović B, Popić JP, Stajić-Trošić J, Talijan NM. Electrochemical deposition of powder alloy Co-Ni-Mo-O. in Zaštita materijala. 2008;49(2):25-30.
https://hdl.handle.net/21.15107/rcub_cer_428 .

Stevanović, Jasmina, Jugović, Branimir, Popić, Jovan P., Stajić-Trošić, Jasna, Talijan, Nadežda M., "Electrochemical deposition of powder alloy Co-Ni-Mo-O" in Zaštita materijala, 49, no. 2 (2008):25-30,
https://hdl.handle.net/21.15107/rcub_cer_428 .

TY  - JOUR
AU  - Jegdić, Bore
AU  - Dražić, Dragutin M.
AU  - Popić, Jovan P.
PY  - 2008
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/473
AB  - Open circuit potential measurements and cyclic voltammetry of chromium and 304 stainless steel in deaerated aqueous H2SO4 solution of pH 1, without and containing NaCl in the concentration range 1-4 M revealed that chromium exhibits two stable open circuit potentials both having the character of a Wagner-Traud corrosion potential. One, Ecorr.1, was established on the passive surface formed by previously exposing Cr to air or by potentiostatic passivation in a controlled manner, and the second one, Ecorr.2, at the bare Cr surface obtained by prolonged cathodic activation. There was a small difference in the Ecorr.1 values depending on the properties of the passive layer. Addition of NaCl accelerates to some extent, the hydrogen evolution reaction on the passive surface, while the same reaction on the bare surface was somewhat inhibited by NaCl. On the other hand, presence of NaCl accelerates the anodic reaction on the bare surface, and it activates the dissolution of the passive layer so that the passivation currents increase with addition of NaCl. This effect is so large that at concentrations of NaCl larger than 3 M, the destruction of the passive layer was so fast that in a matter of seconds the Cr is activated, and the only stable corrosion potential observed was Ecorr.2. No pitting of Cr in the presence of NaCl was observed up to the transpassive potentials. 304 stainless steel could not be activated in sulphuric acid solution, and its open circuit potential, unlike the corrosion potential of the 400 types of stainless steel, was established by the hydrogen evolution reaction on the passive steel surface. The small anodic peak often observed on 304 stainless steel if the metal had been cathodically pre-treated is a pseudo-peak due to the anodic oxidation of hydrogen absorbed inside the metal. This finding should be elaborated more in recommendations (e.g. ASTM standards) for the application of electrochemical corrosion rate measurement to 304 stainless steel corrosion. Addition of NaCl activates the anodic dissolution of steel with the current of the passivation peak being proportional to the NaCl concentration. Unlike chromium, austenitic 304 stainless steel achieves only one corrosion potential in sulphuric acid, both in the presence and absence of NaCl, with the value of ca. -0.200 to -0.350 V (SCE) in the absence and -0.450 V (SCE) in the presence of NaCl, when steel corrodes as the active metal.
T2  - Corrosion Science
T1  - Open circuit potentials of metallic chromium and austenitic 304 stainless steel in aqueous sulphuric acid solution and the influence of chloride ions on them
VL  - 50
IS  - 5
SP  - 1235
EP  - 1244
DO  - 10.1016/j.corsci.2008.01.012
ER  - 

@article{
author = "Jegdić, Bore and Dražić, Dragutin M. and Popić, Jovan P.",
year = "2008",
abstract = "Open circuit potential measurements and cyclic voltammetry of chromium and 304 stainless steel in deaerated aqueous H2SO4 solution of pH 1, without and containing NaCl in the concentration range 1-4 M revealed that chromium exhibits two stable open circuit potentials both having the character of a Wagner-Traud corrosion potential. One, Ecorr.1, was established on the passive surface formed by previously exposing Cr to air or by potentiostatic passivation in a controlled manner, and the second one, Ecorr.2, at the bare Cr surface obtained by prolonged cathodic activation. There was a small difference in the Ecorr.1 values depending on the properties of the passive layer. Addition of NaCl accelerates to some extent, the hydrogen evolution reaction on the passive surface, while the same reaction on the bare surface was somewhat inhibited by NaCl. On the other hand, presence of NaCl accelerates the anodic reaction on the bare surface, and it activates the dissolution of the passive layer so that the passivation currents increase with addition of NaCl. This effect is so large that at concentrations of NaCl larger than 3 M, the destruction of the passive layer was so fast that in a matter of seconds the Cr is activated, and the only stable corrosion potential observed was Ecorr.2. No pitting of Cr in the presence of NaCl was observed up to the transpassive potentials. 304 stainless steel could not be activated in sulphuric acid solution, and its open circuit potential, unlike the corrosion potential of the 400 types of stainless steel, was established by the hydrogen evolution reaction on the passive steel surface. The small anodic peak often observed on 304 stainless steel if the metal had been cathodically pre-treated is a pseudo-peak due to the anodic oxidation of hydrogen absorbed inside the metal. This finding should be elaborated more in recommendations (e.g. ASTM standards) for the application of electrochemical corrosion rate measurement to 304 stainless steel corrosion. Addition of NaCl activates the anodic dissolution of steel with the current of the passivation peak being proportional to the NaCl concentration. Unlike chromium, austenitic 304 stainless steel achieves only one corrosion potential in sulphuric acid, both in the presence and absence of NaCl, with the value of ca. -0.200 to -0.350 V (SCE) in the absence and -0.450 V (SCE) in the presence of NaCl, when steel corrodes as the active metal.",
journal = "Corrosion Science",
title = "Open circuit potentials of metallic chromium and austenitic 304 stainless steel in aqueous sulphuric acid solution and the influence of chloride ions on them",
volume = "50",
number = "5",
pages = "1235-1244",
doi = "10.1016/j.corsci.2008.01.012"
}

Jegdić, B., Dražić, D. M.,& Popić, J. P.. (2008). Open circuit potentials of metallic chromium and austenitic 304 stainless steel in aqueous sulphuric acid solution and the influence of chloride ions on them. in Corrosion Science, 50(5), 1235-1244.
https://doi.org/10.1016/j.corsci.2008.01.012

Jegdić B, Dražić DM, Popić JP. Open circuit potentials of metallic chromium and austenitic 304 stainless steel in aqueous sulphuric acid solution and the influence of chloride ions on them. in Corrosion Science. 2008;50(5):1235-1244.
doi:10.1016/j.corsci.2008.01.012 .

Jegdić, Bore, Dražić, Dragutin M., Popić, Jovan P., "Open circuit potentials of metallic chromium and austenitic 304 stainless steel in aqueous sulphuric acid solution and the influence of chloride ions on them" in Corrosion Science, 50, no. 5 (2008):1235-1244,
https://doi.org/10.1016/j.corsci.2008.01.012 . .

TY  - JOUR
AU  - Popić, Jovan P.
AU  - Jegdić, Bore
PY  - 2008
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/427
AB  - In this work we studied the electrochemical behavior of chromium white cast irons in deaerated aqueous sulphuric acid solutions of the pH 1-3. The measurements of concentrations of dissolved iron and chromium in the solution, as well as the volume of hydrogen evolved were carried out. By comparing the results, it was found that besides the electrochemical corrosion, another, chemical, process occurs at the same time. This process takes place at the surface of the metal, in the contact with the water molecules or hydrogen ions, and produces hydrogen evolution. These results show, that the usual electrochemical determination of the metal corrosion rate must be very critically applied.
AB  - U ovom radu proučavano je elektrohemijsko ponašanje visokohromnog belog gvožđa u dearisanim rastvorima sumporne kiseline u oblasti pH 1-3. Provedena su merenja koncentracije rastvorenog gvožđa i hroma u rastvoru, kao i zapremine izdvojenog vodonika. Poređenjem rezultata konstatovano je da pored elektohemijske korozije jednovremeno teče i drugi hemijski proces koji se odigrava na površini metala u kontaktu sa molekulima vode ili vodoničnim jonima uz izdvajanje vodonika. Ovi rezultati ukazuju da se uobičajene metode elektrohemijskog određivanja brzine korozije metala moraju primenjivati vrlo kritički, uz prethodno dokazivanje da su ovakvi hemijski procesi u odnosu na elektohemijske na ispitivanom metalu relativno zanemarljivi.
PB  - Belgrade, Serbia : Engineering Society for Corrosion
T2  - Zaštita materijala
T1  - Corrosion of chromium white cast iron in acidic medium
T1  - Korozija visokohromnog belog gvožđa u kiseloj sredini
VL  - 49
IS  - 2
SP  - 15
EP  - 23
UR  - https://hdl.handle.net/21.15107/rcub_cer_427
ER  - 

@article{
author = "Popić, Jovan P. and Jegdić, Bore",
year = "2008",
abstract = "In this work we studied the electrochemical behavior of chromium white cast irons in deaerated aqueous sulphuric acid solutions of the pH 1-3. The measurements of concentrations of dissolved iron and chromium in the solution, as well as the volume of hydrogen evolved were carried out. By comparing the results, it was found that besides the electrochemical corrosion, another, chemical, process occurs at the same time. This process takes place at the surface of the metal, in the contact with the water molecules or hydrogen ions, and produces hydrogen evolution. These results show, that the usual electrochemical determination of the metal corrosion rate must be very critically applied., U ovom radu proučavano je elektrohemijsko ponašanje visokohromnog belog gvožđa u dearisanim rastvorima sumporne kiseline u oblasti pH 1-3. Provedena su merenja koncentracije rastvorenog gvožđa i hroma u rastvoru, kao i zapremine izdvojenog vodonika. Poređenjem rezultata konstatovano je da pored elektohemijske korozije jednovremeno teče i drugi hemijski proces koji se odigrava na površini metala u kontaktu sa molekulima vode ili vodoničnim jonima uz izdvajanje vodonika. Ovi rezultati ukazuju da se uobičajene metode elektrohemijskog određivanja brzine korozije metala moraju primenjivati vrlo kritički, uz prethodno dokazivanje da su ovakvi hemijski procesi u odnosu na elektohemijske na ispitivanom metalu relativno zanemarljivi.",
publisher = "Belgrade, Serbia : Engineering Society for Corrosion",
journal = "Zaštita materijala",
title = "Corrosion of chromium white cast iron in acidic medium, Korozija visokohromnog belog gvožđa u kiseloj sredini",
volume = "49",
number = "2",
pages = "15-23",
url = "https://hdl.handle.net/21.15107/rcub_cer_427"
}

Popić, J. P.,& Jegdić, B.. (2008). Corrosion of chromium white cast iron in acidic medium. in Zaštita materijala
Belgrade, Serbia : Engineering Society for Corrosion., 49(2), 15-23.
https://hdl.handle.net/21.15107/rcub_cer_427

Popić JP, Jegdić B. Corrosion of chromium white cast iron in acidic medium. in Zaštita materijala. 2008;49(2):15-23.
https://hdl.handle.net/21.15107/rcub_cer_427 .

Popić, Jovan P., Jegdić, Bore, "Corrosion of chromium white cast iron in acidic medium" in Zaštita materijala, 49, no. 2 (2008):15-23,
https://hdl.handle.net/21.15107/rcub_cer_427 .

TY  - JOUR
AU  - Jegdić, Bore
AU  - Dražić, Dragutin M.
AU  - Popić, Jovan P.
AU  - Radmilović, Velimir R.
PY  - 2007
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/311
AB  - Chromium dissolution in aqueous sulfuric acid solution of pH 1 was studied electrochemically on chromium electrodes with different crystallographic structures. A slow potentiodynamic method was used for the electrochemical measurements in deaerated solutions (purged with nitrogen),while the Cr(III) ions in the solution after the corrosion were determined by atomic absorption spectrometry. Three electrode materials with a very dominant crystallite orientation resembling single crystal structures (i.e., 111 and 110) confirmed by the electron backscattering diffraction (EBSD), were used in the experiments. The (111) structures were somewhat more active electrochemically (both anodic and cathodic) than the (110) structure. However, Cr electrochemically deposited in standard plating bath, assumed from literature data to has also the (111) structure, was more than 4 times active for anodic dissolution and, by the same number, less active for cathodic hydrogen evolution. The concentrations of Cr(III) ions determined in the solution after definite times of corrosion of all the materials showed almost two times larger dissolution rates than observed electrochemically by three different electrochemical methods (Wagner-Traud, Stern-Geary, electrochemical impedance spectroscopy). This is explained by the simultaneous occurrence of potential independent chemical dissolution of Cr, by a direct reaction of metallic Cr with H2O molecules, proposed a long time ago by Kolotyrkin and coworkers. .
AB  - Proučavano je elektrohemijsko rastvaranje hroma u vodenim rastvorima sumporne kiseline (pH 1) sa elektrodama od hroma različite kristalografske strukture. Primenjena je spora potenciodinamička metoda u deaeriranim rastvorima (uz provođenje azota) na 25°C, a joni Cr(III) u rastvoru posle određenog vremena korozije određivani su atomskom apsorpcionom spektroskopijom. U eksperimentima su upotrebljena tri elektrodna materijala sa dominantnim kristalnim strukturama koje podsećaju na mono kristalne (tj. 111 i 110), a što je potvrđeno EBSD metodom. Nađeno je da je struktura (111) elektrohemijski aktivnija (i anodno i katodno) od strukture (110). Međutim, elektrolitički istaložen Cr iz standardnog kupatila za hromiranje, a koji na osnovu literaturnih podataka ima strukturu (111) bio je oko 4 puta aktivniji u anodnoj reakciji i isto toliko manje aktivan za katodnu reakciju izdvajanja vodonika. Analitički određivane koncentracije Cr(III) jona u rastvoru posle određenog vremena spontane korozije pokazivale su dva puta veće koncentracije nego što bi se očekivalo na osnovu brzine elektrohemijske korozije, određivanih metodama Wagner-Traud, Stern-Geary i elektrohemijskom impedansnom spektroskopijom. Ovo je objašnjeno jednovremenim odigravanjem i elektrohemijske reakcije i hemijske reakcije direktnog reagovanja metalnog Cr sa molekulima vode, po mehanizmu predloženom od Kolotirkina i saradnika. .
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Structural effects of metallic chromium on its electrochemical behavior
T1  - Uticaj strukture metalnog hroma na njegovo elektrohemijsko ponašanje
VL  - 72
IS  - 6
SP  - 563
EP  - 578
DO  - 10.2298/JSC0706563J
ER  - 

@article{
author = "Jegdić, Bore and Dražić, Dragutin M. and Popić, Jovan P. and Radmilović, Velimir R.",
year = "2007",
abstract = "Chromium dissolution in aqueous sulfuric acid solution of pH 1 was studied electrochemically on chromium electrodes with different crystallographic structures. A slow potentiodynamic method was used for the electrochemical measurements in deaerated solutions (purged with nitrogen),while the Cr(III) ions in the solution after the corrosion were determined by atomic absorption spectrometry. Three electrode materials with a very dominant crystallite orientation resembling single crystal structures (i.e., 111 and 110) confirmed by the electron backscattering diffraction (EBSD), were used in the experiments. The (111) structures were somewhat more active electrochemically (both anodic and cathodic) than the (110) structure. However, Cr electrochemically deposited in standard plating bath, assumed from literature data to has also the (111) structure, was more than 4 times active for anodic dissolution and, by the same number, less active for cathodic hydrogen evolution. The concentrations of Cr(III) ions determined in the solution after definite times of corrosion of all the materials showed almost two times larger dissolution rates than observed electrochemically by three different electrochemical methods (Wagner-Traud, Stern-Geary, electrochemical impedance spectroscopy). This is explained by the simultaneous occurrence of potential independent chemical dissolution of Cr, by a direct reaction of metallic Cr with H2O molecules, proposed a long time ago by Kolotyrkin and coworkers. ., Proučavano je elektrohemijsko rastvaranje hroma u vodenim rastvorima sumporne kiseline (pH 1) sa elektrodama od hroma različite kristalografske strukture. Primenjena je spora potenciodinamička metoda u deaeriranim rastvorima (uz provođenje azota) na 25°C, a joni Cr(III) u rastvoru posle određenog vremena korozije određivani su atomskom apsorpcionom spektroskopijom. U eksperimentima su upotrebljena tri elektrodna materijala sa dominantnim kristalnim strukturama koje podsećaju na mono kristalne (tj. 111 i 110), a što je potvrđeno EBSD metodom. Nađeno je da je struktura (111) elektrohemijski aktivnija (i anodno i katodno) od strukture (110). Međutim, elektrolitički istaložen Cr iz standardnog kupatila za hromiranje, a koji na osnovu literaturnih podataka ima strukturu (111) bio je oko 4 puta aktivniji u anodnoj reakciji i isto toliko manje aktivan za katodnu reakciju izdvajanja vodonika. Analitički određivane koncentracije Cr(III) jona u rastvoru posle određenog vremena spontane korozije pokazivale su dva puta veće koncentracije nego što bi se očekivalo na osnovu brzine elektrohemijske korozije, određivanih metodama Wagner-Traud, Stern-Geary i elektrohemijskom impedansnom spektroskopijom. Ovo je objašnjeno jednovremenim odigravanjem i elektrohemijske reakcije i hemijske reakcije direktnog reagovanja metalnog Cr sa molekulima vode, po mehanizmu predloženom od Kolotirkina i saradnika. .",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Structural effects of metallic chromium on its electrochemical behavior, Uticaj strukture metalnog hroma na njegovo elektrohemijsko ponašanje",
volume = "72",
number = "6",
pages = "563-578",
doi = "10.2298/JSC0706563J"
}

Jegdić, B., Dražić, D. M., Popić, J. P.,& Radmilović, V. R.. (2007). Structural effects of metallic chromium on its electrochemical behavior. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 72(6), 563-578.
https://doi.org/10.2298/JSC0706563J

Jegdić B, Dražić DM, Popić JP, Radmilović VR. Structural effects of metallic chromium on its electrochemical behavior. in Journal of the Serbian Chemical Society. 2007;72(6):563-578.
doi:10.2298/JSC0706563J .

Jegdić, Bore, Dražić, Dragutin M., Popić, Jovan P., Radmilović, Velimir R., "Structural effects of metallic chromium on its electrochemical behavior" in Journal of the Serbian Chemical Society, 72, no. 6 (2007):563-578,
https://doi.org/10.2298/JSC0706563J . .

TY  - JOUR
AU  - Jegdić, Bore
AU  - Dražić, Dragutin M.
AU  - Popić, Jovan P.
PY  - 2006
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/257
AB  - The potentiodynamic study of the electrochemical behavior of austenitic 304 stainless steel in deaerated aqueous sulfuric acid of pH 1 revealed that the steel achieved a stable corrosion potential of ca. - 0.350 V (SCE) independent of whether the electrode had previously been cathodically "activated" or anodically passivated. It was also shown that the experimentally observed anodic peak was not the usually obtained anodic passivation peak, as is the case with a number of metal, but an artifact due to the anodic oxidation of hydrogen absorbed during the previously employed cathodic polarization and hydrogen evolution, intended to activate the initially passive surface, or even hydrogen absorbed on the open circuit potential. It was shown that this potential establishes and electrochemical corrosion potential of the Wagner-Traud type due to the evolution of cathodic hydrogen on a passivated steel surface and anodic metal dissolution through the passive layer. It was impossible to activate 304 stainless steel in sulfuric acid of pH 1 by cathodic polarization, and the usually observed anodic peak obtained under these conditions should not be considered as an active metal dissolution process and a passivation anodic peak, but rather as an artifact due to the electrochemical oxidation of the in the steel absorbed hydrogen.
AB  - Potenciodinamička ispitivanja elektrohemijskog ponašanja nerđajućeg čelika 304 u deaeriranoj sumpornoj kiselini sa pH 1 pokazala su da se na čeliku uspostavlja stabilan korozioni potencijal od - 0,350 V(ZKE) nezavisno od toga da li je elektroda prethodno katodno tretirana radi "aktivacije", ili je površina bila pasivirana. Pokazano je, takođe, da eksperimentalno dobijeni anodni maksimum na potenciodinamičkoj krivi pozitivnije od korozionog potencijala nije anodni pasivacioni maksimum koji se obično dobija pri anodnoj polarizaciji većeg broja metala u sličnim uslovima, već eksperimentalni artefakt koji nastaje zbog anodne oksidacije vodonika apsorbovanog unutar čelika tokom katodnog "aktiviranja" ili čak i pri dužem držanju na korozionom potencijalu. Pokazano je da je spontano formirani potencijal otvorenog kola zapravo korozioni potencijal koji nastaje kao mešoviti potencijal Vagner-Traudovog tipa suprotnim delovawem katodne reakcije izdvajanja vodonika na pasivnom sloju i anodnog rastvaranja čelika kroz pasivni sloj. Nije bilo mogućno katodnom "aktivacijom" i dugotrajnijom katodnom polarizacijom do značajno negativnih potencijala i vrlo velikih katodnih struja da se pasivni sloj ukloni i postigne aktivno elektrohemijsko rastvaranje metala bez prisustva pasivnog sloja, tj. slobodna metalna površina. Stoga, često eksperimentalno konstatovan anodni maksimum na ovakvim čelicima ne treba da se interpretira kao anodno rastvaranje sa pasivacionim maksimumom, već kao posledica anodne oksidacije apsorbovanog vodonika u pasivnom čeliku, a koji se pod ovim uslovima ne može elektrohemijski aktivirati, odn. depasivirati.
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Corrosion potential of 304 stainless steel in sulfuric acid
T1  - Korozioni potencijal nerđajućeg čelika 304 u sumpornoj kiselini
VL  - 71
IS  - 5
SP  - 543
EP  - 551
DO  - 10.2298/JSC0605543J
ER  - 

@article{
author = "Jegdić, Bore and Dražić, Dragutin M. and Popić, Jovan P.",
year = "2006",
abstract = "The potentiodynamic study of the electrochemical behavior of austenitic 304 stainless steel in deaerated aqueous sulfuric acid of pH 1 revealed that the steel achieved a stable corrosion potential of ca. - 0.350 V (SCE) independent of whether the electrode had previously been cathodically "activated" or anodically passivated. It was also shown that the experimentally observed anodic peak was not the usually obtained anodic passivation peak, as is the case with a number of metal, but an artifact due to the anodic oxidation of hydrogen absorbed during the previously employed cathodic polarization and hydrogen evolution, intended to activate the initially passive surface, or even hydrogen absorbed on the open circuit potential. It was shown that this potential establishes and electrochemical corrosion potential of the Wagner-Traud type due to the evolution of cathodic hydrogen on a passivated steel surface and anodic metal dissolution through the passive layer. It was impossible to activate 304 stainless steel in sulfuric acid of pH 1 by cathodic polarization, and the usually observed anodic peak obtained under these conditions should not be considered as an active metal dissolution process and a passivation anodic peak, but rather as an artifact due to the electrochemical oxidation of the in the steel absorbed hydrogen., Potenciodinamička ispitivanja elektrohemijskog ponašanja nerđajućeg čelika 304 u deaeriranoj sumpornoj kiselini sa pH 1 pokazala su da se na čeliku uspostavlja stabilan korozioni potencijal od - 0,350 V(ZKE) nezavisno od toga da li je elektroda prethodno katodno tretirana radi "aktivacije", ili je površina bila pasivirana. Pokazano je, takođe, da eksperimentalno dobijeni anodni maksimum na potenciodinamičkoj krivi pozitivnije od korozionog potencijala nije anodni pasivacioni maksimum koji se obično dobija pri anodnoj polarizaciji većeg broja metala u sličnim uslovima, već eksperimentalni artefakt koji nastaje zbog anodne oksidacije vodonika apsorbovanog unutar čelika tokom katodnog "aktiviranja" ili čak i pri dužem držanju na korozionom potencijalu. Pokazano je da je spontano formirani potencijal otvorenog kola zapravo korozioni potencijal koji nastaje kao mešoviti potencijal Vagner-Traudovog tipa suprotnim delovawem katodne reakcije izdvajanja vodonika na pasivnom sloju i anodnog rastvaranja čelika kroz pasivni sloj. Nije bilo mogućno katodnom "aktivacijom" i dugotrajnijom katodnom polarizacijom do značajno negativnih potencijala i vrlo velikih katodnih struja da se pasivni sloj ukloni i postigne aktivno elektrohemijsko rastvaranje metala bez prisustva pasivnog sloja, tj. slobodna metalna površina. Stoga, često eksperimentalno konstatovan anodni maksimum na ovakvim čelicima ne treba da se interpretira kao anodno rastvaranje sa pasivacionim maksimumom, već kao posledica anodne oksidacije apsorbovanog vodonika u pasivnom čeliku, a koji se pod ovim uslovima ne može elektrohemijski aktivirati, odn. depasivirati.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Corrosion potential of 304 stainless steel in sulfuric acid, Korozioni potencijal nerđajućeg čelika 304 u sumpornoj kiselini",
volume = "71",
number = "5",
pages = "543-551",
doi = "10.2298/JSC0605543J"
}

Jegdić, B., Dražić, D. M.,& Popić, J. P.. (2006). Corrosion potential of 304 stainless steel in sulfuric acid. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 71(5), 543-551.
https://doi.org/10.2298/JSC0605543J

Jegdić B, Dražić DM, Popić JP. Corrosion potential of 304 stainless steel in sulfuric acid. in Journal of the Serbian Chemical Society. 2006;71(5):543-551.
doi:10.2298/JSC0605543J .

Jegdić, Bore, Dražić, Dragutin M., Popić, Jovan P., "Corrosion potential of 304 stainless steel in sulfuric acid" in Journal of the Serbian Chemical Society, 71, no. 5 (2006):543-551,
https://doi.org/10.2298/JSC0605543J . .

TY  - JOUR
AU  - Jegdić, Bore
AU  - Dražić, Dragutin M.
AU  - Popić, Jovan P.
PY  - 2006
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/274
AB  - Open circuit potential measurements and cyclic voltammetry of chromium in deaerated aqueous H2SO4 solution of pH 1 without and containing NaCl in the concentration range 0.5 - 4 M revealed that chromium exhibits two stable open circuit potentials having the character of a Wagner-Traud corrosion potential. One, E corr.1, was established on the passive surface formed by exposing Cr previously to air or passivated potentiostacially in a controlled manner, and the second one, E corr,2, at the bare Cr surface obtained by prolonged cathodic activation. There is a small difference in the E corr,1 values as a function of the passive layer properties. Addition of NaCl accelerates the hydrogen evolution reaction on the passive surface to some extent, while the same reaction on the bare surface was not affected by NaCl. On the other hand, presence of NaCl accelerates the anodic reaction on the bare surface, and it activates the dissolution of the passive layer so that the passive currents increase with addition of NaCl. This effect is so large that at concentration of NaCl larger than 3 M, the destruction of the passive layer was so fast that in a matter of seconds the Cr was activated, and the only one stable corrosion potential observed was E corr.2. No pitting of Cr in the presence of NaCl was observed up to the transpassive potentials.
AB  - Merenja potencijala otvorenog kola, kao i merenja primenom ciklične voltametrije u deaerisanim vodenim rastvorima H 2SO4, pH1, bez i sa dodatkom NaCl u koncentracionom opsegu 0,5-4M, otkrila su da hrom pokazuje dva stabilna potencijala otvorenog kola koji imaju osobine Wagner-Traud-ovog korozionog potencijala. Jedan korozioni potencijal, E corr.1 , se uspostavljao na pasiviranoj površini, koja se formira prethodnim izlaganjem Cr vazduhu, ili poteciostatskim pasiviranjem na kontrolisan način, a drugi, E corr.2 , se obrazovao na goloj površini Cr koja je formirana katodnom aktivacijom u dovoljno dugom periodu vremena. Postoji izvesna mala razlika u vrednostima E corr.1 kao funkcija osobina pasivnog sloja. Dodatak NaCl u određenoj meri ubrzava reakciju izdvajanja vodonika na pasiviranoj površini, dok NaCl nema uticaja na istu reakciju na goloj površini Cr. Sa druge strane prisustvo NaCl ubrzava anodnu reakciju na goloj površini hroma i aktivira rastvaranje pasivnog sloja, tako da se struja pasivacije povećava sa dodatkom NaCl. Uticaj NaCl je toliko veliki, da pri koncentracijama većim od 3M, razaranje pasivnog sloja postaje brzo, da se Cr za vreme od nekoliko sekundi aktivira i tada se uočava samo jedan stabilni korozioni potencijal E corr.2 . Nije uočena pojava pitinga u prisustvu NaCl, sve do potencijala u transpasivnoj oblasti.
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Influence of chloride ions on the open circuit potentials of chromium in deaerated sulfuric acid solutions
T1  - Uticaj hloridnih jona na potencijal otvorenog kola hroma u deaerisanim rastvorima sumporne kiseline
VL  - 71
IS  - 11
SP  - 1187
EP  - 1194
DO  - 10.2298/JSC0611187J
ER  - 

@article{
author = "Jegdić, Bore and Dražić, Dragutin M. and Popić, Jovan P.",
year = "2006",
abstract = "Open circuit potential measurements and cyclic voltammetry of chromium in deaerated aqueous H2SO4 solution of pH 1 without and containing NaCl in the concentration range 0.5 - 4 M revealed that chromium exhibits two stable open circuit potentials having the character of a Wagner-Traud corrosion potential. One, E corr.1, was established on the passive surface formed by exposing Cr previously to air or passivated potentiostacially in a controlled manner, and the second one, E corr,2, at the bare Cr surface obtained by prolonged cathodic activation. There is a small difference in the E corr,1 values as a function of the passive layer properties. Addition of NaCl accelerates the hydrogen evolution reaction on the passive surface to some extent, while the same reaction on the bare surface was not affected by NaCl. On the other hand, presence of NaCl accelerates the anodic reaction on the bare surface, and it activates the dissolution of the passive layer so that the passive currents increase with addition of NaCl. This effect is so large that at concentration of NaCl larger than 3 M, the destruction of the passive layer was so fast that in a matter of seconds the Cr was activated, and the only one stable corrosion potential observed was E corr.2. No pitting of Cr in the presence of NaCl was observed up to the transpassive potentials., Merenja potencijala otvorenog kola, kao i merenja primenom ciklične voltametrije u deaerisanim vodenim rastvorima H 2SO4, pH1, bez i sa dodatkom NaCl u koncentracionom opsegu 0,5-4M, otkrila su da hrom pokazuje dva stabilna potencijala otvorenog kola koji imaju osobine Wagner-Traud-ovog korozionog potencijala. Jedan korozioni potencijal, E corr.1 , se uspostavljao na pasiviranoj površini, koja se formira prethodnim izlaganjem Cr vazduhu, ili poteciostatskim pasiviranjem na kontrolisan način, a drugi, E corr.2 , se obrazovao na goloj površini Cr koja je formirana katodnom aktivacijom u dovoljno dugom periodu vremena. Postoji izvesna mala razlika u vrednostima E corr.1 kao funkcija osobina pasivnog sloja. Dodatak NaCl u određenoj meri ubrzava reakciju izdvajanja vodonika na pasiviranoj površini, dok NaCl nema uticaja na istu reakciju na goloj površini Cr. Sa druge strane prisustvo NaCl ubrzava anodnu reakciju na goloj površini hroma i aktivira rastvaranje pasivnog sloja, tako da se struja pasivacije povećava sa dodatkom NaCl. Uticaj NaCl je toliko veliki, da pri koncentracijama većim od 3M, razaranje pasivnog sloja postaje brzo, da se Cr za vreme od nekoliko sekundi aktivira i tada se uočava samo jedan stabilni korozioni potencijal E corr.2 . Nije uočena pojava pitinga u prisustvu NaCl, sve do potencijala u transpasivnoj oblasti.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Influence of chloride ions on the open circuit potentials of chromium in deaerated sulfuric acid solutions, Uticaj hloridnih jona na potencijal otvorenog kola hroma u deaerisanim rastvorima sumporne kiseline",
volume = "71",
number = "11",
pages = "1187-1194",
doi = "10.2298/JSC0611187J"
}

Jegdić, B., Dražić, D. M.,& Popić, J. P.. (2006). Influence of chloride ions on the open circuit potentials of chromium in deaerated sulfuric acid solutions. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 71(11), 1187-1194.
https://doi.org/10.2298/JSC0611187J

Jegdić B, Dražić DM, Popić JP. Influence of chloride ions on the open circuit potentials of chromium in deaerated sulfuric acid solutions. in Journal of the Serbian Chemical Society. 2006;71(11):1187-1194.
doi:10.2298/JSC0611187J .

Jegdić, Bore, Dražić, Dragutin M., Popić, Jovan P., "Influence of chloride ions on the open circuit potentials of chromium in deaerated sulfuric acid solutions" in Journal of the Serbian Chemical Society, 71, no. 11 (2006):1187-1194,
https://doi.org/10.2298/JSC0611187J . .

TY  - JOUR
AU  - Dražić, Dragutin M.
AU  - Jegdić, Bore
AU  - Popić, Jovan P.
PY  - 2005
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/198
AB  - It was shown that metallic chromium in aqueous solution of sulfuric acid dissolves in accord with the electrochemical mechanism proposed by Wagner and Traud, but also by a direct chemical reaction of metal with water molecules from the electrolyte, as proposed by Kolotyrkin and coworkers. The experiments in this study were carried out with three different chromium samples: large grain size cast chromium obtained from Merck Co., Germany fine grain metallic chromium rods, obtained from Goodfellows, Pa, USA, and a 121 џт thick electroplated layer of chromium on steel. It was shown that the rates of electrochemical and chemical corrosion are close to each other and similar on all three materials, while on the electroplated chromium surfaces anodic dissolution was ca. 5 times faster than on other chromium surfaces while catholic hydrogen evolution was ca. 5 times slower than on other chromium surfaces. These differences are obviously the consequences of the differences in the structure of electroplated chromium as contrasted to the other chromium samples. This conclusion is supported by the results obtained with the samples with two large crystal grains of different structure and orientation.
AB  - Pokazano je da se u vodenim rastvorima sumporne kiseline metalni hrom rastvara elektrohemijskim mehanizmom u skladu sa modelom Vaguera i Trauda ali da se hrom paralelno rastvara i hemijskim mehanizmom po modelu Kolotirkina i saradnika direktnim reagovanjem metala sa molekulima vode iz rastvora. Kao materijal za ispitivanje služio je krupnozrni liveni hrom sitnozrni kovani i valjani hrom i elektrolitički istaložena hromna prevlaka. Pokazano je da su brzine elektrohemijske i hemijske korozije međusobno slične kod sva tri materijala, dok je elektrohemijska prevlaka imala oko 5 puta bržu anodnu reakciju i skoro 5 puta sporiju katodnu reakciju izdvajanja vodonika. Ove razlike posledica su svakako razlika u strukturi i kristalografskoj orijentaciji hromne prevlake prema rastvoru, što se u izvesnoj meri uočava i na primeru krupnozrne livene strukture, gde dva različita velika zrna imaju određene razlike u brzinama ovih elektrohemijskih reakcija, iako u znatno manjoj meri.
PB  - Belgrade, Serbia : Engineering Society for Corrosion
T2  - Zaštita materijala
T1  - Influence of the structure of metallic chromium on its electrochemical and chemical corrosion
T1  - Uticaj strukture metalnog hroma na njegovu elektrohemijsku i hemijsku koroziju
VL  - 46
IS  - 2
SP  - 29
EP  - 34
UR  - https://hdl.handle.net/21.15107/rcub_cer_198
ER  - 

@article{
author = "Dražić, Dragutin M. and Jegdić, Bore and Popić, Jovan P.",
year = "2005",
abstract = "It was shown that metallic chromium in aqueous solution of sulfuric acid dissolves in accord with the electrochemical mechanism proposed by Wagner and Traud, but also by a direct chemical reaction of metal with water molecules from the electrolyte, as proposed by Kolotyrkin and coworkers. The experiments in this study were carried out with three different chromium samples: large grain size cast chromium obtained from Merck Co., Germany fine grain metallic chromium rods, obtained from Goodfellows, Pa, USA, and a 121 џт thick electroplated layer of chromium on steel. It was shown that the rates of electrochemical and chemical corrosion are close to each other and similar on all three materials, while on the electroplated chromium surfaces anodic dissolution was ca. 5 times faster than on other chromium surfaces while catholic hydrogen evolution was ca. 5 times slower than on other chromium surfaces. These differences are obviously the consequences of the differences in the structure of electroplated chromium as contrasted to the other chromium samples. This conclusion is supported by the results obtained with the samples with two large crystal grains of different structure and orientation., Pokazano je da se u vodenim rastvorima sumporne kiseline metalni hrom rastvara elektrohemijskim mehanizmom u skladu sa modelom Vaguera i Trauda ali da se hrom paralelno rastvara i hemijskim mehanizmom po modelu Kolotirkina i saradnika direktnim reagovanjem metala sa molekulima vode iz rastvora. Kao materijal za ispitivanje služio je krupnozrni liveni hrom sitnozrni kovani i valjani hrom i elektrolitički istaložena hromna prevlaka. Pokazano je da su brzine elektrohemijske i hemijske korozije međusobno slične kod sva tri materijala, dok je elektrohemijska prevlaka imala oko 5 puta bržu anodnu reakciju i skoro 5 puta sporiju katodnu reakciju izdvajanja vodonika. Ove razlike posledica su svakako razlika u strukturi i kristalografskoj orijentaciji hromne prevlake prema rastvoru, što se u izvesnoj meri uočava i na primeru krupnozrne livene strukture, gde dva različita velika zrna imaju određene razlike u brzinama ovih elektrohemijskih reakcija, iako u znatno manjoj meri.",
publisher = "Belgrade, Serbia : Engineering Society for Corrosion",
journal = "Zaštita materijala",
title = "Influence of the structure of metallic chromium on its electrochemical and chemical corrosion, Uticaj strukture metalnog hroma na njegovu elektrohemijsku i hemijsku koroziju",
volume = "46",
number = "2",
pages = "29-34",
url = "https://hdl.handle.net/21.15107/rcub_cer_198"
}

Dražić, D. M., Jegdić, B.,& Popić, J. P.. (2005). Influence of the structure of metallic chromium on its electrochemical and chemical corrosion. in Zaštita materijala
Belgrade, Serbia : Engineering Society for Corrosion., 46(2), 29-34.
https://hdl.handle.net/21.15107/rcub_cer_198

Dražić DM, Jegdić B, Popić JP. Influence of the structure of metallic chromium on its electrochemical and chemical corrosion. in Zaštita materijala. 2005;46(2):29-34.
https://hdl.handle.net/21.15107/rcub_cer_198 .

Dražić, Dragutin M., Jegdić, Bore, Popić, Jovan P., "Influence of the structure of metallic chromium on its electrochemical and chemical corrosion" in Zaštita materijala, 46, no. 2 (2005):29-34,
https://hdl.handle.net/21.15107/rcub_cer_198 .

TY  - JOUR
AU  - Dražić, Dragutin M.
AU  - Popić, Jovan P.
AU  - Jegdić, Bore
AU  - Vasiljević-Radović, Dana
PY  - 2004
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/144
AB  - Chromium dissolution in aqueous sulfuric acid solutions in the pH range 0.5 –3 was studied electrochemically by the potentiostatic or very slow potentiodynamic method, and by the analyses of the Cr ion concentrations in the electrolyte formed during the experiments. It was shown that the electrochemical anodic dissolution follows a common Tafel line with a slope of ca. 120 mVdec-1, independent of the solution pH and the hydrodynamics while the passivation potentials and passivation currents were independent on hydrodynamics but strongly dependent on the pH. In parallel with the electrochemical dissolution, a considerable "anomalous" or chemical Cr dissolution process occurs, as evidenced by the spectrophotometric analyses of the electrolytes for Cr ions after prolonged potentiostating of the electrodes at different potentials, as well as by measuring the electrode weight losses. All these results indicate the existence of a potential independent reaction of Cr dissolution occurring in parallel to the anodic dissolution process. Mechanisms for both the electrochemical and the chemical process are proposed. The consequences of these phenomena on the behavior of some practical systems where chromium or a chromium alloy (e.g., stainless steels) are used are discussed.
AB  - Proučavano je anodno rastvaranje hroma u vodenim rastvorima sumporne kiseline u oblasti pH 0,5 – 3 potenciostatskom i vrlo sporom potenciodinamičkom metodom, kao i analitičkim praćenjem promene koncentracije Cr jona tokom eksperimenata. Pokazano je da elektrohemijsko anodno rastvaranje prati uobičajeno Tafelovo ponašanje sa nagibom Tafelove prave od oko 120 mV dec-1 kao i da je nezavisno od pH i hidrodinamike. Međutim, potencijali pasivacije i struje pasivacije takođe su nezavisni od hidrodinamike, ali vrlo zavisne od pH. Jednovremeno sa elektrohemijskim rastvaranjem odigrava se i značajno "anomalno" ili hemijsko rastvaranje hroma. Ovo je potvrđeno i spektrofotometrijskim analizama rastvora tokom dužeg potenciostatskog održavanja katodnih i anodnih polarizacija, kao i merenjem gubitka mase elektrode. Svi ovi rezultati ukazuju na odigravanje nezavisne reakcije rastvaranja hroma koja nije zavisna od potencijala, kao što je slučaj sa elektrohemijskom reakcijom. Predloženi su mehanizmi odigravanja oba navedena procesa. Razmotrene su i posledice postojanja oba navedenafenomena na ponašanje nekih praktičnih sistema u kojima se koristi hrom ili legure hroma (npr. nerđajući čelik).
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Electrochemistry of active chromium, part IV: Dissolution of chromium in deaerated sulfuric acid
T1  - Elektrohemija aktivnog hroma, deo IV - rastvaranje hroma u deaeriranom vodenom rastvoru sumporne kiseline
VL  - 69
IS  - 12
SP  - 1099
EP  - 1110
DO  - 10.2298/JSC0412099D
ER  - 

@article{
author = "Dražić, Dragutin M. and Popić, Jovan P. and Jegdić, Bore and Vasiljević-Radović, Dana",
year = "2004",
abstract = "Chromium dissolution in aqueous sulfuric acid solutions in the pH range 0.5 –3 was studied electrochemically by the potentiostatic or very slow potentiodynamic method, and by the analyses of the Cr ion concentrations in the electrolyte formed during the experiments. It was shown that the electrochemical anodic dissolution follows a common Tafel line with a slope of ca. 120 mVdec-1, independent of the solution pH and the hydrodynamics while the passivation potentials and passivation currents were independent on hydrodynamics but strongly dependent on the pH. In parallel with the electrochemical dissolution, a considerable "anomalous" or chemical Cr dissolution process occurs, as evidenced by the spectrophotometric analyses of the electrolytes for Cr ions after prolonged potentiostating of the electrodes at different potentials, as well as by measuring the electrode weight losses. All these results indicate the existence of a potential independent reaction of Cr dissolution occurring in parallel to the anodic dissolution process. Mechanisms for both the electrochemical and the chemical process are proposed. The consequences of these phenomena on the behavior of some practical systems where chromium or a chromium alloy (e.g., stainless steels) are used are discussed., Proučavano je anodno rastvaranje hroma u vodenim rastvorima sumporne kiseline u oblasti pH 0,5 – 3 potenciostatskom i vrlo sporom potenciodinamičkom metodom, kao i analitičkim praćenjem promene koncentracije Cr jona tokom eksperimenata. Pokazano je da elektrohemijsko anodno rastvaranje prati uobičajeno Tafelovo ponašanje sa nagibom Tafelove prave od oko 120 mV dec-1 kao i da je nezavisno od pH i hidrodinamike. Međutim, potencijali pasivacije i struje pasivacije takođe su nezavisni od hidrodinamike, ali vrlo zavisne od pH. Jednovremeno sa elektrohemijskim rastvaranjem odigrava se i značajno "anomalno" ili hemijsko rastvaranje hroma. Ovo je potvrđeno i spektrofotometrijskim analizama rastvora tokom dužeg potenciostatskog održavanja katodnih i anodnih polarizacija, kao i merenjem gubitka mase elektrode. Svi ovi rezultati ukazuju na odigravanje nezavisne reakcije rastvaranja hroma koja nije zavisna od potencijala, kao što je slučaj sa elektrohemijskom reakcijom. Predloženi su mehanizmi odigravanja oba navedena procesa. Razmotrene su i posledice postojanja oba navedenafenomena na ponašanje nekih praktičnih sistema u kojima se koristi hrom ili legure hroma (npr. nerđajući čelik).",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Electrochemistry of active chromium, part IV: Dissolution of chromium in deaerated sulfuric acid, Elektrohemija aktivnog hroma, deo IV - rastvaranje hroma u deaeriranom vodenom rastvoru sumporne kiseline",
volume = "69",
number = "12",
pages = "1099-1110",
doi = "10.2298/JSC0412099D"
}

Dražić, D. M., Popić, J. P., Jegdić, B.,& Vasiljević-Radović, D.. (2004). Electrochemistry of active chromium, part IV: Dissolution of chromium in deaerated sulfuric acid. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 69(12), 1099-1110.
https://doi.org/10.2298/JSC0412099D

Dražić DM, Popić JP, Jegdić B, Vasiljević-Radović D. Electrochemistry of active chromium, part IV: Dissolution of chromium in deaerated sulfuric acid. in Journal of the Serbian Chemical Society. 2004;69(12):1099-1110.
doi:10.2298/JSC0412099D .

Dražić, Dragutin M., Popić, Jovan P., Jegdić, Bore, Vasiljević-Radović, Dana, "Electrochemistry of active chromium, part IV: Dissolution of chromium in deaerated sulfuric acid" in Journal of the Serbian Chemical Society, 69, no. 12 (2004):1099-1110,
https://doi.org/10.2298/JSC0412099D . .

TY  - JOUR
AU  - Dražić, Dragutin M.
AU  - Popić, Jovan P.
AU  - Rakočević, Zlatko Lj.
PY  - 1999
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4397
AB  - By combining the techniques of electrochemical slow potentiodynamic, AC impedance and atomic force microscopy (AFM), it was shown that the differences in the anodic dissolution rates of Al in 0.5 NaCl solutions as measured experimentally in the potential region between the corrosion and pitting potential, are mainly due to differences in surface roughness of the electrodes used. It was shown that mechanical grinding and polishing of the electrode surface with emery paper (400 grit) and alumina polishing powder ((Latin small letter o with stroke) 0.25 μm) can produce surfaces differing by a factor of 6 in the roughness factor Ra. By using AFM estimates of the roughness factors a true electrode capacitance of 4.63 μC cm-2 and thickness dox ≈ 2.0 nm for the barrier layer of the surface film was estamited. The outer part of the film is porous, partly as amorphous A1(OH)3, or crystalline bayerite (Al2O3-3H2O).
AB  - Pokazano je, kombinovanim korišćenjem tehnika spore potenciodinamike, AC impedance i atomske mikroskopije (AFM), da su razlike u brzinama anodnog rastvarača Al u 0,5 M NaCl u oblasti između korozionog i piting potencijala, a koje se zapažaju u eksperimentima, prvenstveno posledica razlike u površinskoj hrapavosti različito pripremljenih elektroda. Pokazano je da se mehaničkim brušenjem (finoća 400) i poliranjem Al2O3 pastom (0,25 mm) dobija razlika faktora hrapavosti za oko 6 puta. Uz pomoć AFM tehnike za određivanje faktora hrapavosti procenjena je prava kapacitivnost elektroda od 4,63 mF cm–2 i debljina barijernog sloja oksida od dox ≈ 2,0 nm. Spoljašnji porozni sloj je delimično amorfan Al(OH)3 ili kristalinični bajerit (Al2O3.3H2O).
PB  - Belgrade : Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Real surface area of the aluminium electrode in sodium chloride solution
T1  - Stvarna površina eletrode od aluminijuma u rastvoru natrijum-hlorida
VL  - 64
IS  - 11
SP  - 685
EP  - 685
DO  - 10.2298/jsc9911685d
ER  - 

@article{
author = "Dražić, Dragutin M. and Popić, Jovan P. and Rakočević, Zlatko Lj.",
year = "1999",
abstract = "By combining the techniques of electrochemical slow potentiodynamic, AC impedance and atomic force microscopy (AFM), it was shown that the differences in the anodic dissolution rates of Al in 0.5 NaCl solutions as measured experimentally in the potential region between the corrosion and pitting potential, are mainly due to differences in surface roughness of the electrodes used. It was shown that mechanical grinding and polishing of the electrode surface with emery paper (400 grit) and alumina polishing powder ((Latin small letter o with stroke) 0.25 μm) can produce surfaces differing by a factor of 6 in the roughness factor Ra. By using AFM estimates of the roughness factors a true electrode capacitance of 4.63 μC cm-2 and thickness dox ≈ 2.0 nm for the barrier layer of the surface film was estamited. The outer part of the film is porous, partly as amorphous A1(OH)3, or crystalline bayerite (Al2O3-3H2O)., Pokazano je, kombinovanim korišćenjem tehnika spore potenciodinamike, AC impedance i atomske mikroskopije (AFM), da su razlike u brzinama anodnog rastvarača Al u 0,5 M NaCl u oblasti između korozionog i piting potencijala, a koje se zapažaju u eksperimentima, prvenstveno posledica razlike u površinskoj hrapavosti različito pripremljenih elektroda. Pokazano je da se mehaničkim brušenjem (finoća 400) i poliranjem Al2O3 pastom (0,25 mm) dobija razlika faktora hrapavosti za oko 6 puta. Uz pomoć AFM tehnike za određivanje faktora hrapavosti procenjena je prava kapacitivnost elektroda od 4,63 mF cm–2 i debljina barijernog sloja oksida od dox ≈ 2,0 nm. Spoljašnji porozni sloj je delimično amorfan Al(OH)3 ili kristalinični bajerit (Al2O3.3H2O).",
publisher = "Belgrade : Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Real surface area of the aluminium electrode in sodium chloride solution, Stvarna površina eletrode od aluminijuma u rastvoru natrijum-hlorida",
volume = "64",
number = "11",
pages = "685-685",
doi = "10.2298/jsc9911685d"
}

Dražić, D. M., Popić, J. P.,& Rakočević, Z. Lj.. (1999). Real surface area of the aluminium electrode in sodium chloride solution. in Journal of the Serbian Chemical Society
Belgrade : Serbian Chemical Society., 64(11), 685-685.
https://doi.org/10.2298/jsc9911685d

Dražić DM, Popić JP, Rakočević ZL. Real surface area of the aluminium electrode in sodium chloride solution. in Journal of the Serbian Chemical Society. 1999;64(11):685-685.
doi:10.2298/jsc9911685d .

Dražić, Dragutin M., Popić, Jovan P., Rakočević, Zlatko Lj., "Real surface area of the aluminium electrode in sodium chloride solution" in Journal of the Serbian Chemical Society, 64, no. 11 (1999):685-685,
https://doi.org/10.2298/jsc9911685d . .

TY  - JOUR
AU  - Dražić, Dragutin M.
AU  - Popić, Jovan
PY  - 1999
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4082
AB  - The rotating disc-ring technique with a Pt ring was used to quantitatively detect hydrogen evolved on an Al-disc electrode during spontaneous corrosion at open-circuit potential or during anodic polarization of an Al disc to study the unusual increase of H2 evolution with increase in anodic current (the so called negative difference effect). Experiments were made with high purity Al (99.999%), technical grade Al (99.5%) (Al–T) and Al–In alloy (0.074% In) in deaerated 0.5m aqueous NaCl solution (pH∼6.5) and NaCl solutions acidified with HCl to pH values of 3.0, 2.0 and 1.0. It was shown, in neutral solutions, that the corrosion rates of all three materials are controlled by the rate of water molecule dissociation or in more acid solutions, by the combined water molecule dissociation rate and H+ ion discharge rate. The corrosion rates of all three materials in the range of 3–10μAcm2, was the lowest for 99.999% Al. The impurities in Al–T and Al–In increase the hydrogen evolution rate at cathodic polarizations in a similar manner, but very differently affect the negative difference effect. High purity Al and Al–T have a similar negative difference effect (8–15%), while the presence of In decreases it to only about 1%. No pitting and no negative difference effect were observed at potentials more negative than Epit. Therefore, the negative difference effect is connected with the anodic pitting dissolution mechanism. Several aspects of this problem are discussed in more detail.
PB  - Springer
T2  - Journal of Applied Electrochemistry
T1  - Corrosion rates and negative difference effects for Al and some Al alloys
VL  - 29
SP  - 43
EP  - 50
DO  - 10.1023/A:1003447018115
ER  - 

@article{
author = "Dražić, Dragutin M. and Popić, Jovan",
year = "1999",
abstract = "The rotating disc-ring technique with a Pt ring was used to quantitatively detect hydrogen evolved on an Al-disc electrode during spontaneous corrosion at open-circuit potential or during anodic polarization of an Al disc to study the unusual increase of H2 evolution with increase in anodic current (the so called negative difference effect). Experiments were made with high purity Al (99.999%), technical grade Al (99.5%) (Al–T) and Al–In alloy (0.074% In) in deaerated 0.5m aqueous NaCl solution (pH∼6.5) and NaCl solutions acidified with HCl to pH values of 3.0, 2.0 and 1.0. It was shown, in neutral solutions, that the corrosion rates of all three materials are controlled by the rate of water molecule dissociation or in more acid solutions, by the combined water molecule dissociation rate and H+ ion discharge rate. The corrosion rates of all three materials in the range of 3–10μAcm2, was the lowest for 99.999% Al. The impurities in Al–T and Al–In increase the hydrogen evolution rate at cathodic polarizations in a similar manner, but very differently affect the negative difference effect. High purity Al and Al–T have a similar negative difference effect (8–15%), while the presence of In decreases it to only about 1%. No pitting and no negative difference effect were observed at potentials more negative than Epit. Therefore, the negative difference effect is connected with the anodic pitting dissolution mechanism. Several aspects of this problem are discussed in more detail.",
publisher = "Springer",
journal = "Journal of Applied Electrochemistry",
title = "Corrosion rates and negative difference effects for Al and some Al alloys",
volume = "29",
pages = "43-50",
doi = "10.1023/A:1003447018115"
}

Dražić, D. M.,& Popić, J.. (1999). Corrosion rates and negative difference effects for Al and some Al alloys. in Journal of Applied Electrochemistry
Springer., 29, 43-50.
https://doi.org/10.1023/A:1003447018115

Dražić DM, Popić J. Corrosion rates and negative difference effects for Al and some Al alloys. in Journal of Applied Electrochemistry. 1999;29:43-50.
doi:10.1023/A:1003447018115 .

Dražić, Dragutin M., Popić, Jovan, "Corrosion rates and negative difference effects for Al and some Al alloys" in Journal of Applied Electrochemistry, 29 (1999):43-50,
https://doi.org/10.1023/A:1003447018115 . .