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Corrosion Protection of at Alloys by Solution Cast Ta2O5

Published online by Cambridge University Press:  22 February 2011

Yeong C. Lin  and
Stephen T. Wellinghoff
Yeong C. Lin
Affiliation:
Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455
Stephen T. Wellinghoff
Affiliation:
Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455
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Abstract

A newly developed amorphous, corrosion resistant Ta2O5 coating in saturated H2/H2O/Cl2 environment was studied by scanning and transmission electron microscopy and surface spectroscopy. Although Ta2O5 films formed on polished Al single crystal surfaces by sputter deposition of Ta and subsequent anodization effectively prevent the Al from corrosion by water saturated with chlorine, Al alloy surfaces are not protected, since the anodic film formed over grain boundaries, processing lines, and emergent Precipitates is poorly adherent, thus providing loci for corrosion. This problem was eliminated by casting a 400Å layer of tantalum oxyhydroxide polymer from ethanol solution onto the Al alloy substrate and curing to a Ta2O5 layer that effectively resisted attack by wet chlorine.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 40: Symposium J – Electronic Packaging Materials Science I , 1984 , 97
Copyright
Copyright © Materials Research Society 1985

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