Initial Events during the Passivation of Rapidly Dissolving Aluminum Surfaces

dc.contributor.author Tak, Yongsug
dc.contributor.author Hebert, Kurt
dc.contributor.author Hebert, Kurt R
dc.contributor.department Chemical and Biological Engineering
dc.date 2018-02-13T21:07:59.000
dc.date.accessioned 2020-06-30T01:10:40Z
dc.date.available 2020-06-30T01:10:40Z
dc.date.copyright Sat Jan 01 00:00:00 UTC 1994
dc.date.embargo 2014-02-10
dc.date.issued 1994
dc.description.abstract <p>The early stages of oxide film passivation of corroding surfaces in aluminum etch tunnels and pits were investigated. Passivation was initiated by step reductions in applied current. A mathematical model for passivation was used to predict experimentally measured potential transients during the first millisecond after the current step. The experimental transients had a characteristic potential undershoot at about 70 μs after the current step; according to the model, the undershoot was directly related to the partial coverage of the corroding surface with an oxide layer. The time and extent of the undershoot were in quantitative agreement with the theoretical predictions, suggesting that the fractional actively dissolving area in the pit at these times is a linear function of potential and adjusts rapidly to changes of the potential. This reconfiguration of the active area occurs at times when the extent of passive film formation is still small. A chemical mechanism for passivation which is consistent with the model is one in which the fractional active area is controlled by the coverage of specifically adsorbed chloride ions. Agreement between experimental and predicted potential transients was also observed at room temperature, where no tunnels are found, but only corrosion pits with irregular shapes.</p>
dc.description.comments <p>This article is from <em>Journal of the Electrochemical Society</em> 141 (1994): 1453–1459, doi:<a href="http://dx.doi.org/10.1149/1.2054945" target="_blank">10.1149/1.2054945</a>. Posted with permission.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/cbe_pubs/61/
dc.identifier.articleid 1068
dc.identifier.contextkey 5096542
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath cbe_pubs/61
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/13561
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/cbe_pubs/61/1994_TakY_InitialEventsDuring.pdf|||Sat Jan 15 01:15:46 UTC 2022
dc.source.uri 10.1149/1.2054945
dc.subject.disciplines Chemical Engineering
dc.subject.keywords aluminum
dc.subject.keywords passivation
dc.subject.keywords oxidation
dc.subject.keywords dissolving
dc.subject.keywords electrochemistry
dc.subject.keywords electric potential
dc.subject.keywords transient response
dc.title Initial Events during the Passivation of Rapidly Dissolving Aluminum Surfaces
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication 1c209ea4-85ad-49b9-aebd-14873e016053
relation.isOrgUnitOfPublication 86545861-382c-4c15-8c52-eb8e9afe6b75
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