電流反転法によるアルミニウム陽極酸化皮膜の微細構造

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A study was conducted on the relationship between the anodizing conditions on aluminum as determined by pulse current with a negative component and the microstructure of the anodic oxide films. Anodic oxidation was carried out in solutions of 15 wt% H2SO4, 5 wt% H2C2O4 and 10 wt% CrO3, with the reversing cycle set at 13.3Hz.The cells and pores of the films obtained in the sulfuric acid using pulse current with a negative component were uniform size, and size was not significantly influenced by the anodizing conditions. In films formed using pulse current with a negative component in the oxalic acid solutions, cell and pore size was uniform. The pores divided into branches, and the degree of branching became greater as the duty factor decreased. The microstructure of the films prepared in the chromic acid solutions was similar to that of films prepared in the oxalic acid baths.
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