連続ねじり加工を行ったAl-Mg合金の耐孔食性 Pitting Corrosion Resistance of Aluminum-Magnesium Alloy Processed with Continuous Rotation Evolutional Control

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The pitting corrosion resistance of an Al-Mg alloy produced by continuous rotation evolutional control (CREO) was investigated by means of polarization curves in solutions containing 0.1mol/L Na<sub>2</sub>SO<sub>4</sub> and 300ppm Cl<sup>−</sup>, and by surface analysis. The pitting potential of Al-Mg alloy was evidently shifted to the noble direction by CREO, and the time required for initiating pitting corrosion of the Al-Mg alloy while kept at a constant potential of −0.1V was longer with CREO than without, indicating improvement in the pitting corrosion resistance by application of CREO. Al-Mg alloy contained such precipitates as Al-Fe intermetallic compounds and trace quantities of Si, around which pitting corrosion occurred. CREO pulverized these precipitates. The time-dependence of corrosion potential and the polarization resistance determined by the AC impedance technique suggest that the resistance of Al oxide films was increased with CREO. Therefore, it was concluded that the improvement of pitting corrosion resistance of Al-Mg alloy with CREO was caused by both decreasing the size of the precipitates which acted as cathodes during corrosion and increasing the film resistance of Al oxide.

収録刊行物

  • 表面技術 = The Journal of the Surface Finishing Society of Japan

    表面技術 = The Journal of the Surface Finishing Society of Japan 59(6), 395-400, 2008-06-01

    一般社団法人 表面技術協会

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各種コード

  • NII論文ID(NAID)
    10021170177
  • NII書誌ID(NCID)
    AN1005202X
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    09151869
  • NDL 記事登録ID
    9531229
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z17-291
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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