バリヤー型電解液と皮膜成長型電解液によるアルミニウムの二段電解

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書誌事項

タイトル別名
  • Sulfuric Acid or Oxalic Acid Reanodizing of Aluminum Having Barrier Layer As Formed in Ammonium Borate Solution
  • バリヤーカタ デンカイエキ ト ヒマク セイチョウガタ デンカイエキ ニヨル

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抄録

Al (99.85%) and Al-Cu (Cu: 3.5-4.5%) alloy anodized at various voltages in a 5% ammonium borate solution, were reanodized in 1M sulfuric acid and 1/2M oxalic acid solutions, respectively. For the secondary anodizing, V-T curves and surface states were observed. Irregular black spots formed on the anodized surface of Al and Al-Cu alloy specimens in sulfuric acid. In oxalic acid anodizing, films were brown at initial voltage (100V or lower), violet at 150V, blue at 200V, but brown for Al-Cu alloy. The film formation on Al took place initially at the corners of each specimen and eventually over the entire surface. The peak voltage of the V-T curves for the secondary electrolysis in oxalic acid was higher than the initial voltage in the ammonium borate solution. The peak voltage is an indication of breakdown of the barrier layer. In anodizing of Al-Cu alloy in oxalic acid, the final voltage in the V-T curves was constricted, owing to the dissolution of copper, to the low voltage as in the case of anodizing the alloy in the ammonium borate solution.

収録刊行物

  • 金属表面技術

    金属表面技術 27 (10), 526-530, 1976

    一般社団法人 表面技術協会

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