Galvanic Corrosion of Anodized Aluminum-Influence of Anodic Oxide Film Structure and Concentration of Cl--

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Other Title
  • 陽極酸化したアルミニウムの異種金属接触腐食―酸化物皮膜構造と塩化物イオン濃度の影響―
  • ヨウキョク サンカシタ アルミニウム ノ イシュ キンゾク セッショク フショク サンカブツ ヒマク コウゾウ ト エンカブツ イオン ノウド ノ エイキョウ
  • —Influence of Anodic Oxide Film Structure and Concentration of Cl<sup>–</sup>—
  • ―酸化物皮膜構造と塩化物イオン濃度の影響―

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Description

The effect of anodic oxide film structure, barrier type and porous type on galvanic corrosion resistance of aluminum in 0.5 kmol/m3 H3BO3 / 0.05 kmol/m3 Na2B4O7 with NaCl was examined by electrochemical random signal (electrochemical noise) analysis technique. When pitting corrosion occurs, rest potential suddenly decreases and current increases rapidly, and rest potential and current change with fluctuation during galvanic corrosion. The galvanic current change correlates closely with corrosion potential change. As the thickness of both types of anodic oxide films and decreasing of chloride ion concentration, the incubation time of pitting corrosion became longer, and incubation time of pitting corrosion of specimen formed porous type anodic oxide film is longer than that of specimen formed barrier type anodic oxide film. The inverse of incubation time increase with chloride ion concentration to the power of n, [Cl–]n. The value of n is between 1.2 and 2.5 in both oxide films.

Journal

  • Corrosion Engineering

    Corrosion Engineering 57 (4), 194-200, 2008

    Japan Society of Corrosion Engineering

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