強歪加工を施したAl‐Cu合金の陽極酸化膜の耐孔食性

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タイトル別名
  • Pitting Corrosion Resistance of Anodized Aluminum-Copper Alloy Processed by Severe Plastic Deformation
  • 強ひずみ加工を施したAI-Cu合金の陽極酸化膜の耐孔食性
  • キョウヒズミ カコウ オ ホドコシタ AI Cu ゴウキン ノ ヨウキョク サンカマク ノ タイコウショクセイ

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抄録

  The effect of equal-channel angular pressing (ECAP) on the pitting corrosion resistance of anodized Al-Cu alloy was investigated by electrochemical techniques in a solution containing 0.2 mol/L of AlCl3 and also by surface analysis. The time required before initiating pitting corrosion of anodized Al-Cu alloy was longer with ECAP than without, indicating improvement in the pitting corrosion resistance by application of ECAP. Second phase precipitates were present in Al-Cu alloy matrix and the size of these precipitates was greatly decreased by application of ECAP. The precipitates composed of Si and Al-Cu-Si-Fe-Mn were not oxidized during anodization, and the anodic oxide film were absent at the boundary between the normal oxide films and these impurity precipitates. The pitting corrosion of anodized Al-Cu alloy occurred preferentially around these precipitates, the improvement of pitting corrosion resistance of anodized Al-Cu alloy by ECAP appears to be attributable to a decrease in the size of precipitates, which act as origins of pitting corrosion.<br>

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 72 (5), 353-359, 2008

    公益社団法人 日本金属学会

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