Effect of equal-channel angular pressing on pitting corrosion of pure aluminum

Injoon Son, Hiroaki Nakano, Satoshi Oue, Shigeo Kobayashi, Hisaaki Fukushima, Zenji Horita

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    10 Citations (Scopus)

    Abstract

    The effect of equal-channel angular pressing (ECAP) on the pitting corrosion of pure Al was investigated using electrochemical techniques in solutions containing 0.1 m mol·dm-3 of Na2SO 4 and 8.46 mol·dm-3 of NaCl (300 ppm Cl -) and followed by surface analysis. The potential for pitting corrosion of pure Al was clearly shifted in the noble direction by the ECAP process indicating that this process improves resistance to pitting corrosion. The time dependence of corrosion potential and the anodic potential at 1 A·m-2 revealed that the rate of formation of Al oxide films increased due to a decrease in the grain size of the Al after ECAP. Since there exists a negligible amount of impurity precipitates in pure Al, the improvement in pitting corrosion resistance of pure Al by ECAP appears to be attributable to an increase in the rate of formation of Al oxide films.

    Original languageEnglish
    Article number450854
    JournalInternational Journal of Corrosion
    Volume2012
    DOIs
    Publication statusPublished - 2012

    All Science Journal Classification (ASJC) codes

    • Materials Science(all)
    • Process Chemistry and Technology

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