Effects of Electrolyte Anions on The Formation of Barrier Type Oxide Films on Aluminum

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  • アルミニウムのバリヤー型アノード酸化皮膜の生成挙動に対する電解質アニオンの影響
  • アルミニウム ノ バリヤーカタ アノード サンカ ヒマク ノ セイセイ キョド

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Abstract

Aluminum was anodically oxidized to form barrier type oxide films at 5.0mA/m2 and 20°C in adipate, borate, citrate, oxalate, phosphate, and tartrate solutions of pH=7 at different concentrations between 10-3 and 1.0M. From measurements of the rate of increase in anode potential, dEa/dta, and dissolution rate of Al3+ ions, dWd/dta, the oxide formation current, If, oxide dissolution current, id, and electronic current, ie, were determined as a function of electrolyte concentration. It was found that with increasing concentration, if reaches a maximum between 10-2 and 10-1M after which it decreases considerably, and id reaches a minimum in the same concentration range. The oxide formation current, if, in the 10-1M solutions decreases in the following order: Adipate>Phosphate>Citrate>Tartrate>Oxalate>Borate. The electronic current, ie, is appreciable at 10-3M, while it is negligibly small at concentrations higher than 10-2M. The role of the electrolyte anions on the formation of barrier type oxide films is discussed in terms of the pH-buffering ability and complexing ability of the electrolyte anions.

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