Study on the Corrosion Resistivity of Al-Mg Alloys by means of a Potentiostat

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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 potentiostat was not so good. From the polarization curves in acidic, neutral and alkaline aqueous solutions, however, the effects of the magnesium content could be seen. The results of the potentiostatic measurements were in good agreement with those obtained by ordinary corrosion tests. Anodic polarization of an Al-1% Mg alloy in aqueous solutions of hydrochloric acid or sodium chloride sometimes showed abnormal behavior. The surface of these alloys were examined by the electron diffraction method. According to the electron diffraction patterns, formation of MgAl_2O_4 films could be observed only on the surface of an Al-1% Mg alloy. This film would be more stable to chlorine 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 co-worker 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 oh aging time ; namely, the longer the aging time, the more sensitive the alloys were to corrosion. From these results, it was concluded that the potentiostatic measurements could be applied to the study of aging of light alloys.
東北大学の論文

Study on the Corrosion Resistivity of Al-Mg Alloys by means of a Potentiostat

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