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dc.creatorJovanović, Vladislava M.
dc.creatorHackerman, Norman
dc.date.accessioned2020-09-16T09:03:44Z
dc.date.available2020-09-16T09:03:44Z
dc.date.issued1998
dc.identifier.issn1520-6106
dc.identifier.uri2-s2.0-0012536136&doi=10.1021%2fjp982602z&partnerID=40&md5=ae6f88941b7fd45cb7dffafc4442b197
dc.identifier.urihttp://cer.ihtm.bg.ac.rs/handle/123456789/3670
dc.description.abstractElectrochemical 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.en
dc.languageEnglish
dc.publisherAmerican Chemical Society (ACS)
dc.relationThe Robert A. Welch Foundation of Houston, Texas
dc.rightsrestrictedAccess
dc.sourceJournal of Physical Chemistry B
dc.sourceJournal of Physical Chemistry BJ Phys Chem B
dc.subjectElectrochemical passivation
dc.subjectCorrosion potentials
dc.subjectAnodic polarization
dc.subjectThe oxygen evolution
dc.titleElectrochemical passivation of iron in NO3-, SO42-, and ClO4- solutionsen
dc.typearticleen
dc.rights.licenseARR
dcterms.abstractЈовановић, Владислава М.; Хацкерман, Норман; Елецтроцхемицал пассиватион оф ирон ин НО3-, СО42-, анд ЦлО4- солутионс;
dc.citation.volume102
dc.citation.issue49
dc.citation.spage9855
dc.citation.epage9860
dc.identifier.doi10.1021/jp982602z
dc.identifier.scopus2-s2.0-0012536136
dc.identifier.wos000077464500014
dc.type.versionpublishedVersion


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