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Some observations for effects of copper on zinc phosphate conversion coatings on aluminum surfaces

TitleSome observations for effects of copper on zinc phosphate conversion coatings on aluminum surfaces
Publication TypeJournal Article
Year of Publication2002
AuthorsSun, X, Susac, D, Li, R, Wong, KC, Foster, T, Mitchell, KAR
JournalSurface & Coatings Technology
Volume155
Pagination46-50
Date PublishedJun
Type of ArticleArticle
ISBN Number0257-8972
KeywordsALLOY, aluminum, corrosion, photoetectron spectroscopy, scanning electron microscopy, zinc phosphating
Abstract

X-Ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and electrochemical measurements have been used to characterize zinc phosphate (ZPO) conversion coatings, formed on high-purity aluminum surfaces, after dipping in coating baths containing different concentrations of Cu2+ up to 50 ppm. Significant variations in the morphology, adhesion and corrosion protection afforded by the ZPO coatings are especially observed as the Cu2+ in the bath varies from 0 to 10 ppm. Comparisons are made with the effects of surface Cu segregation on ZPO coatings formed in a previous study made on Al-2024-T3 alloy. (C) 2002 Elsevier Science B.V. All rights reserved.

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