| 摘要 |
PURPOSE:To opaquely color an Al base alloy according to the purpose for which it is used, by forming an anodic oxide film on the surface of the Al base alloy contg a specified amount of Cu, roughening the surface of the film under specified conditions and dyeing the film. CONSTITUTION:An Al base alloy material contg. 0.05-4.0% Cu is anodically oxidized in an electrolytic bath contg. oxalic acid to form an anodic oxide film on the surface. The bath voltage is then suddenly dropped to 5-35V and constant-voltage electrolysis is carried out in the same electrolytic bath to uniformly roughen the surface of the anodic oxide film by recovery phenomenon. After the surface of the film is made opaque by the roughening, the film is dyed to opaquely color the Al base alloy material.
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