ポテンショスタットによるAl-Mg合金の耐食性の研究

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タイトル別名
  • Study on the Corrosion Resistivity of Al-Mg Alloys by a Potentiostat
  • ポテンショスタット ニ ヨル Al-Mg ゴウキン ノ タイショクセイ ノ ケンキュウ

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抄録

The electrochemical behavior of Al-Mg alloys were studied by means of a potentiostat. Since oxide films can be easily formed on Al-Mg alloys, both components of which are active, the reproducibility of results obtained by the potentiostatic was not so good. From the polarization curves in acid, neutral, and alkaline solutions, however, the effects of magnesium content could be seen. Results of these measurements were in good agreement with that obtained by corrosion tests. Anodic polarization of Al-1%Mg alloy in hydrochrolic acid or chloride solutions showed sometimes abnormal behavior. The surface of these alloys were examined by electron diffraction. According to the electron diffraction patterns, formation of MgAl2O4 films could be observed on the surface of Al-1%Mg alloy. This film may be more stable to chloride ions than the surface films of pure aluminium and high magnesium content alloys. The effect of aging on Al-Mg alloys was recently studied by Jacquet and his coworker only in the anodic region. In the present research, this effect on Al-5%Mg alloy was measured both in the anodic and the cathodic regions. In the anodic region, the degree of etching was dependent on aging time, and cathodic polarization was also dependent on aging time; namely, the longer the aging time, the alloys were more corrosive. From these results, it was concluded that the potentiostatic measurements could be applied to the study of aging of light alloys.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 26 (5), 297-302, 1962

    公益社団法人 日本金属学会

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