Formation of nanocrystalline surface layers by annealing and their role in filiform corrosion of aluminum sheet

Annealing of specific rolled aluminum alloys at temperatures above 300 deg C causes a significant increase in the filiform corrosion susceptibility of the painted substrate. As demonstrated for a selected substrate (AA8006), the increased susceptibility is related to the formation of a thin, (electr...

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Bibliographic Details
Published in:Journal of the Electrochemical Society 1997-07, Vol.144 (7), p.L196-L197
Main Authors: LETH-OLSEN, H, NORDLIEN, J. H, NISANCIOGLU, K
Format: Article
Language:English
Subjects:
Applied sciences
Corrosion
Corrosion prevention
Exact sciences and technology
Metals. Metallurgy
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Summary:Annealing of specific rolled aluminum alloys at temperatures above 300 deg C causes a significant increase in the filiform corrosion susceptibility of the painted substrate. As demonstrated for a selected substrate (AA8006), the increased susceptibility is related to the formation of a thin, (electro)chemically active nanocrystalline layer at the surface as a result of the annealing treatment. The corrosion resistance is significantly improved by removing the layer by etching during surface treatment. Possible causes of layer formation and its activity are discussed.
ISSN:0013-4651
1945-7111
DOI:10.1149/1.1837797