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The role of chromate conversion coating in the filiform corrosion of coated aluminum alloys
RISE - Research Institutes of Sweden, Materials and Production, KIMAB. (Institut de la Corrosion)
CNRS, France.
RISE - Research Institutes of Sweden, Materials and Production, KIMAB. (Institut de la Corrosion)
RISE - Research Institutes of Sweden, Materials and Production, KIMAB.
2003 (English)In: Journal of the Electrochemical Society, ISSN 0013-4651, E-ISSN 1945-7111, Vol. 150, no 12, p. B561-B566Article in journal (Refereed) Published
Abstract [en]

The mechanisms of inhibition of chromate conversion coating on the filiform corrosion of coated aluminum alloy AA6016 was investigated using X-ray absorption near-edge structure (XANES) spectroscopy and Raman microspectroscopy. The results showed that Cr(VI) was preferably leached out at the opening of the filament, whereas Cr(VI) was reduced to Cr(III) at all other locations. The leached out Cr(VI) accumulated mainly in the pitting area, located in the scratch just outside the filament. The chromate released from the CCC was partly reduced to Cr(III) in the pit. The formation of an Al/Cr mixed oxide was observed in the pitting area. The repassivation of pits in the scratch by the chromate leaching from the CCC close to the scratch explains the low propagation of filiform corrosion observed for the chromated surfaces.

Place, publisher, year, edition, pages
2003. Vol. 150, no 12, p. B561-B566
Keywords [en]
Absorption spectroscopy, Chromate coatings, Corrosion, Leaching, Pitting, Raman spectroscopy, X ray photoelectron spectroscopy, X ray spectroscopy, Chromate conversion coatings, Filiform corrosion, X ray absorption near edge structure, Aluminum alloys
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:ri:diva-40451DOI: 10.1149/1.1621413Scopus ID: 2-s2.0-0347682198OAI: oai:DiVA.org:ri-40451DiVA, id: diva2:1359773
Available from: 2019-10-10 Created: 2019-10-10 Last updated: 2019-10-14Bibliographically approved

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