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Behaviour of zinc in electropolished and etched Al–Zn alloys and effect on corrosion potential

Arenas, M.A., Iglesias-Rubianes, L., Liu, Y., Skeldon, P., Thompson, G.E., Habazaki, H., Shimizu, K., Bailey, Paul and Noakes, T.C.Q. (2005) Behaviour of zinc in electropolished and etched Al–Zn alloys and effect on corrosion potential. Corrosion Science, 47 (9). pp. 2321-2331. ISSN 0010-938X

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Abstract

The enrichments of zinc developed in binary, solid solution Al–0.3at.%Zn, Al–0.4at.%Zn and Al–1at.%Zn alloys by electropolishing and alkaline etching are examined using Rutherford backscattering spectroscopy and medium energy ion scattering with additional interest in how such enrichments affect the corrosion potentials of the alloys. During alkaline etching in 0.1 M sodium hydroxide solution, significant enrichments of zinc arise in the alloy, similar to that achieved by an anodizing treatment. However, enrichment is unusually low following electropolishing in perchloric acid solution. Contrary to the effect of enriched copper in Al–Cu alloys, zinc enrichment has minor influence on the corrosion potentials of etched alloys in ammonium pentaborate solution, which remain roughly within ±100 mV of those of non-enriched alloys.

Item Type: Article
Subjects: Q Science > Q Science (General)
Q Science > QC Physics
Schools: School of Applied Sciences
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Depositing User: Sharon Beastall
Date Deposited: 12 Sep 2012 09:29
Last Modified: 12 Sep 2012 09:29
URI: http://eprints.hud.ac.uk/id/eprint/14839

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