Features in aluminium alloy grains and their effects on anodizing and corrosion

U. Donatus, G. E. Thompson, D. Elabar, T. Hashimoto, S. Morsch

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Distinct chemically and mechanically induced features, evident in the grains of the AA5083-O aluminium alloy, and their effects on anodizing and corrosion have been studied. The grain distinct features are orientation dependent and are ridge-like. These features were found after anodizing in Barker's reagent and after micro-trimming with a diamond knife (during the ultramicrotomy process). The grain features were also found to have a relationship with the anodic films formed on the alloy. Distinct striations (associated with the formation of the ridge-like features found after anodizing) were observed on the surface of the alloy after the removal of the anodic layer (using a solution containing 20g Cr2O3+30ml HPO3 in 1l of deionised water at 60°C). Further etched regions, after the removal of the anodic layer, revealed subsurface micro-layers which appear to have significant influence on the corrosion, anodizing and mechanical (at micro-scale) behaviour of the alloy.

    Original languageEnglish
    Pages (from-to)91-98
    Number of pages8
    JournalSurface and Coatings Technology
    Volume277
    DOIs
    Publication statusPublished - 15 Sept 2015

    Keywords

    • Aluminium alloy
    • Anodizing
    • Corrosion
    • Grain features

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