Effect of continuous rotation evolutional control on the pitting corrosion resistance of anodized aluminum-magnesium alloy

Hiroaki Nakano, In Joon Son, Hideki Ohara, Satoshi Oue, Katsuaki Nakamura, Hisaaki Fukushima

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    2 Citations (Scopus)

    Abstract

    The effect of continuous rotation evolutional control (CREO) on the pitting corrosion resistance of anodized Al-Mg alloy was investigated by electrochemical techniques in a solution containing 0.2 mol/L of AlCl 3 and by surface analysis. The potentials for pitting corrosion of Al-Mg alloy was evidently shifted to the less noble direction by CREO and the time required before initiating pitting corrosion was shorter with CREO, indicating that the corrosion resistance was worse with CREO than without. The precipitates of Fe-Al intermetallic compounds remained in anodic oxide films of Al-Mg alloy. Cracks occurred in the anodic oxide films through the precipitates during initial pitting corrosion. The pitting corrosion was accelerated by cracks. The internal stress present in the anodic oxide films was higher in the alloys with CREO than without. It is assumed that the pitting corrosion is promoted by these cracks as a result of the higher internal stress resulting from the CREO.

    Original languageEnglish
    Pages (from-to)394-400
    Number of pages7
    JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
    Volume73
    Issue number5
    DOIs
    Publication statusPublished - May 2009

    All Science Journal Classification (ASJC) codes

    • Condensed Matter Physics
    • Mechanics of Materials
    • Metals and Alloys
    • Materials Chemistry

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