| 摘要 |
PURPOSE:To form a colored film with superior corrosion resistance and wear resistance by subjecting Al having a formed anodic oxide film to anodic oxidation, AC electrolysis and anodizing and by carrying out electrolytic coloring in an aqueous soln. contg. a metallic salt. CONSTITUTION:Al or an Al alloy having an anodic oxide film formed in an aqueous soln. of sulfuric acid is anodized in an aqueous soln. forming a barrier film so as to homogenize a formed barrier layer, and the anodic oxide film is made microporous by AC electrolysis in an aqueous soln. contg. one or more among sulfuric acid, nitric acid, oxalic acid, sulfamic acid and ammonium hydrogensulfate. Anodizing is further carried out to improve the throwing power A desired colored film is then formed by electrolytic coloring in a bath contg. a metallic salt such as a salt of Ni, Co, Sn or Cu in accordance with the color tone to be provided.
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