Incorporation of Cr in the passive film on Fe from chromate solutions

The uptake of Cr species from chromate solutions by Fe has been studied using X-ray absorption near edge structure (XANES). The objective of the investigation was to compare XANES with radioactive tracer techniques used by Brasher et al. Cr(III) was detected on the passive iron surface. The amount o...

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Published inElectrochimica acta Vol. 47; no. 19; pp. 3127 - 3130
Main Authors Isaacs, H.S, Virtanen 1, S, Ryan, M.P, Schmuki 1, P, Oblonsky, L.J
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 27.07.2002
Subjects
Chromate adsorption
Chromate inhibitor
Chromium species
Iron passivity
X-ray absorption spectroscopy
Chromate adsorption
Chromate inhibitor
X-ray absorption spectroscopy
Iron passivity
Chromium species
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Summary:The uptake of Cr species from chromate solutions by Fe has been studied using X-ray absorption near edge structure (XANES). The objective of the investigation was to compare XANES with radioactive tracer techniques used by Brasher et al. Cr(III) was detected on the passive iron surface. The amount of Cr(III) was increased by cathodic polarization and decreased by anodic polarization. This demonstrated that the uptake of Cr(III) was the result of cathodic processes and was not a direct result of the growth of the passive oxide film. Cr(VI) was only found after Fe was exposed to a saturated dichromate solutions for extended periods indicating that Cr(VI) was not strongly absorbed on the passive film.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0013-4686
1873-3859
DOI:10.1016/S0013-4686(02)00231-1