Al-Si鋳造合金の硫酸溶液中におけるアノード酸化挙動

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Al-Si casting alloys with Si contents (Csi) of 0-17wt% and ADC12 die casting alloy were anodized in 10% H2SO4 at 20°C under a constant current density (ia) to examine the anodizing characteristics and film properties of these alloys. The anode potential (Ea) and dissolution current of Al3+ (ia) during anodizing, the average film thickness (δ) and the diffuse reflectance of films were examined as functions of the abrasion thickness (X) of specimens, anodizing time (ta) and ia.The steady value of Ea, Ea*, for the casting alloys was found to increase with Csi at X=100μm, and showed a maximum at Csi=10wt% and X=1100μm. The value of Ea* for ADC12 increased steeply with ia, and was much larger than that for the casting alloys. Dissolution current efficiency, id/ia, decreased with ia, and Csi, independent of X, for both casting alloy and ADC12 specimens.Oxide films formed after anodizing for 40min showed thickness differences on both types of specimen, and the dispersion in the film thickness increased with Csi and ia. The value of δ for the casting alloys decreased appreciably with increasing Csi, independent of X, at current densities of less than 100A/m2, but increased with increasing X at 200A/m2. The value of δ for ADC12 was considerably smaller than that for the casting alloys, suggesting higher rates of side reaction such as oxygen evolution.The diffuse reflectance spectra showed that the reflectance of films decreased with increasing Csi, and with decreasing X.
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Al-Si鋳造合金の硫酸溶液中におけるアノード酸化挙動

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