Chloride ion penetration of passive films on iron

Two possibilities of the action of chloride ions on passive film surfaces exist: the chloride ions locally remove some metal cations from defects on the surface, which initiates local pitting, or chloride ions penetrate through the passive film without forming visible pits. SIMS data on tested elect...

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Bibliographic Details
Published inJournal of the Electrochemical Society Vol. 130; no. 8; pp. 1792 - 1794
Main Authors MURPHY, O. J, BOCKRIS, J. O. M, POU, T. E, TONGSON, L. L, MONKOWSKI, M. D
Format Journal Article
LanguageEnglish
Published Pennington, NJ Electrochemical Society 01.08.1983
Subjects
Applied sciences
Corrosion
Corrosion environments
Cross-disciplinary physics: materials science; rheology
Exact sciences and technology
Materials science
Metals, semimetals and alloys
Metals. Metallurgy
Physics
Specific materials
Theoretical study
Adsorption
Corrosion
Experimental study
Passivity
Chlorides
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Summary:Two possibilities of the action of chloride ions on passive film surfaces exist: the chloride ions locally remove some metal cations from defects on the surface, which initiates local pitting, or chloride ions penetrate through the passive film without forming visible pits. SIMS data on tested electrode showed that for increasing exposure times, up to breakdown time (160 s) increasing amounts of chloride ions penetrate the passive films. For exposure times longer than breakdown, a decrease in the chloride content is apparent. Chloride ions penetrate passive films right up to the metal/film interface. Chloride itself coordinates with Fe exp 3+ ions, thus removing what is, in this model, the essential species (Fe exp 3+ -OH) in the passive layer. The anhydrous polycrystalline model of the passive film seems less consistent with the data than the hydrated amorphous model. 17 ref.--MAY
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0013-4651
1945-7111
DOI:10.1149/1.2120098