TY  - JOUR
AU  - Babić-Samardžija, Ksenija
AU  - Hackerman, Norman
AU  - Sovilj, Sofija P.
AU  - Jovanović, Vladislava M.
PY  - 2008
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/483
AB  - The inhibiting effect of cobalt(III) complexes with macrocyclic ligand cyclam (1,4,8,11-tetraazacyclotetradecane) and β-diketonato ligands have been investigated on iron corrosion in 0.1 M HClO 4 by potentiodynamic, linear polarization resistance (LPR), and electrochemical impedance spectroscopy (EIS) measurements. Analysis of the polarization curves and impedance spectra, by adding complex compounds to the acid solution and comparing with inhibitor-free solution, show corrosion current decrease and charge transfer resistance increase, respectively. Impedance data are fitted with equivalent circuit models. The stability of the adsorbed film was followed by LPR. Scanning electron microscopy (SEM) was used to screen physical changes of the reacted surfaces both treated and untreated. The differences in inhibitor efficiencies depend on the substituent group of the coordinated β-diketone ligand. Structural and electronic properties of this group of compounds in relation to inhibitor efficiency were analyzed by using the molecular modeling structures and correlated with previously reported spectroscopy data.
T2  - Journal of Solid State Electrochemistry
T1  - The inhibiting effect of cobalt(III)-cyclam complexes with substituted β-diketones on iron corrosion in perchlorate solution
VL  - 12
IS  - 2
SP  - 155
EP  - 163
DO  - 10.1007/s10008-007-0375-4
ER  - 

@article{
author = "Babić-Samardžija, Ksenija and Hackerman, Norman and Sovilj, Sofija P. and Jovanović, Vladislava M.",
year = "2008",
abstract = "The inhibiting effect of cobalt(III) complexes with macrocyclic ligand cyclam (1,4,8,11-tetraazacyclotetradecane) and β-diketonato ligands have been investigated on iron corrosion in 0.1 M HClO 4 by potentiodynamic, linear polarization resistance (LPR), and electrochemical impedance spectroscopy (EIS) measurements. Analysis of the polarization curves and impedance spectra, by adding complex compounds to the acid solution and comparing with inhibitor-free solution, show corrosion current decrease and charge transfer resistance increase, respectively. Impedance data are fitted with equivalent circuit models. The stability of the adsorbed film was followed by LPR. Scanning electron microscopy (SEM) was used to screen physical changes of the reacted surfaces both treated and untreated. The differences in inhibitor efficiencies depend on the substituent group of the coordinated β-diketone ligand. Structural and electronic properties of this group of compounds in relation to inhibitor efficiency were analyzed by using the molecular modeling structures and correlated with previously reported spectroscopy data.",
journal = "Journal of Solid State Electrochemistry",
title = "The inhibiting effect of cobalt(III)-cyclam complexes with substituted β-diketones on iron corrosion in perchlorate solution",
volume = "12",
number = "2",
pages = "155-163",
doi = "10.1007/s10008-007-0375-4"
}

Babić-Samardžija, K., Hackerman, N., Sovilj, S. P.,& Jovanović, V. M.. (2008). The inhibiting effect of cobalt(III)-cyclam complexes with substituted β-diketones on iron corrosion in perchlorate solution. in Journal of Solid State Electrochemistry, 12(2), 155-163.
https://doi.org/10.1007/s10008-007-0375-4

Babić-Samardžija K, Hackerman N, Sovilj SP, Jovanović VM. The inhibiting effect of cobalt(III)-cyclam complexes with substituted β-diketones on iron corrosion in perchlorate solution. in Journal of Solid State Electrochemistry. 2008;12(2):155-163.
doi:10.1007/s10008-007-0375-4 .

Babić-Samardžija, Ksenija, Hackerman, Norman, Sovilj, Sofija P., Jovanović, Vladislava M., "The inhibiting effect of cobalt(III)-cyclam complexes with substituted β-diketones on iron corrosion in perchlorate solution" in Journal of Solid State Electrochemistry, 12, no. 2 (2008):155-163,
https://doi.org/10.1007/s10008-007-0375-4 . .

TY  - JOUR
AU  - Jovanović, Vladislava M.
AU  - Hackerman, Norman
PY  - 1998
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3670
AB  - Electrochemical passivation of iron was studied in NO3-, SO42-, and ClO4- solutions of different pH values. Passivation potential of iron in NO3- and ClO4- was similar for any pH examined, while in SO42- it was more anodic. Passive current was lowest in NO3- (10 ± 2 μA/cm2), in SO42- was in the range of 40-60 μA/cm2 while in ClO4- passive current of 30-50 μA/cm2 was reached only at 600-800 mV. After passivation, the properties of passivated iron are similar in NO3- and SO42- but differ in ClO4-. In the latter, the passive region is shorter by 200-300 mV. The transpassive potential in ClO4- is 1.2 V vs SCE and independent of pH, but shifts anodically with decrease in ClO4- concentration. The transpassive potential in NO3- and SO42- is higher, O2 evolution starts, and the potential shifts cathodically with increase of pH. At the transpassive potential in ClO4-, a black substance forms which dissipates in acidic solutions and is stable in strong alkaline solutions. Microphotographs of anodically polarized iron in these solutions show no pits, only uniform corrosion over the whole electrode surface. We assume that the rapid increase of anodic current at transpassive potential in ClO4- is due to oxidation of iron and iron oxides from the passive film to hexavalent iron.
PB  - American Chemical Society (ACS)
T2  - Journal of Physical Chemistry B
T2  - Journal of Physical Chemistry BJ Phys Chem B
T1  - Electrochemical passivation of iron in NO3-, SO42-, and ClO4- solutions
VL  - 102
IS  - 49
SP  - 9855
EP  - 9860
DO  - 10.1021/jp982602z
ER  - 

@article{
author = "Jovanović, Vladislava M. and Hackerman, Norman",
year = "1998",
abstract = "Electrochemical passivation of iron was studied in NO3-, SO42-, and ClO4- solutions of different pH values. Passivation potential of iron in NO3- and ClO4- was similar for any pH examined, while in SO42- it was more anodic. Passive current was lowest in NO3- (10 ± 2 μA/cm2), in SO42- was in the range of 40-60 μA/cm2 while in ClO4- passive current of 30-50 μA/cm2 was reached only at 600-800 mV. After passivation, the properties of passivated iron are similar in NO3- and SO42- but differ in ClO4-. In the latter, the passive region is shorter by 200-300 mV. The transpassive potential in ClO4- is 1.2 V vs SCE and independent of pH, but shifts anodically with decrease in ClO4- concentration. The transpassive potential in NO3- and SO42- is higher, O2 evolution starts, and the potential shifts cathodically with increase of pH. At the transpassive potential in ClO4-, a black substance forms which dissipates in acidic solutions and is stable in strong alkaline solutions. Microphotographs of anodically polarized iron in these solutions show no pits, only uniform corrosion over the whole electrode surface. We assume that the rapid increase of anodic current at transpassive potential in ClO4- is due to oxidation of iron and iron oxides from the passive film to hexavalent iron.",
publisher = "American Chemical Society (ACS)",
journal = "Journal of Physical Chemistry B, Journal of Physical Chemistry BJ Phys Chem B",
title = "Electrochemical passivation of iron in NO3-, SO42-, and ClO4- solutions",
volume = "102",
number = "49",
pages = "9855-9860",
doi = "10.1021/jp982602z"
}

Jovanović, V. M.,& Hackerman, N.. (1998). Electrochemical passivation of iron in NO3-, SO42-, and ClO4- solutions. in Journal of Physical Chemistry B
American Chemical Society (ACS)., 102(49), 9855-9860.
https://doi.org/10.1021/jp982602z

Jovanović VM, Hackerman N. Electrochemical passivation of iron in NO3-, SO42-, and ClO4- solutions. in Journal of Physical Chemistry B. 1998;102(49):9855-9860.
doi:10.1021/jp982602z .

Jovanović, Vladislava M., Hackerman, Norman, "Electrochemical passivation of iron in NO3-, SO42-, and ClO4- solutions" in Journal of Physical Chemistry B, 102, no. 49 (1998):9855-9860,
https://doi.org/10.1021/jp982602z . .