Electrochemical passivation of iron in NO3-, SO42-, and ClO4- solutions
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1998
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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 ano...dically 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.
Ključne reči:
Electrochemical passivation / Corrosion potentials / Anodic polarization / The oxygen evolutionIzvor:
Journal of Physical Chemistry B, 1998, 102, 49, 9855-9860Izdavač:
- American Chemical Society (ACS)
Finansiranje / projekti:
- The Robert A. Welch Foundation of Houston, Texas
DOI: 10.1021/jp982602z
ISSN: 1520-6106
WoS: 000077464500014
Scopus: 2-s2.0-0012536136
Institucija/grupa
IHTMTY - 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 . .