Anodic oxidation of Al-Ag alloys

M. A. Paez, A. Sandoval, Y. Sepulveda, A. Monsalve, P. Skeldon, G. E. Thompson, X. Zhou

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The anodic oxidation of solution-treated and quenched Al-Ag alloys containing 0.3, 0.6, 0.9 and 1.2 at.%Ag, is examined in ammonium pentaborate electrolyte, which leads to growth of barrier-type anodic films. Enrichments of silver, ~3.1 × 1015 Ag atoms cm-2, are developed in the alloys immediately beneath the amorphous alumina films, with the level of enrichment not depending significantly upon the composition of the bulk alloy. The enrichment is relatively low due to clustering of silver atoms in the bulk alloy, which reduces the concentration of silver that is available to enrich from solid solution. Silver species are incorporated into the anodic film, where they migrate outward faster than Al3+ ions. © 2002 Elsevier Science Ltd. All rights reserved.
    Original languageEnglish
    Pages (from-to)2857-2863
    Number of pages6
    JournalCorrosion Science
    Volume44
    Issue number12
    DOIs
    Publication statusPublished - Dec 2002

    Keywords

    • Aluminium
    • Anodic films
    • Anodizing
    • Silver

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