COLORATION METHOD FOR ALUMINUM AND ALUMINUM ALLOY

摘要

PROBLEM TO BE SOLVED: To provide a coloration method for aluminum and aluminum alloy which is capable of coloring the surface of the aluminum and aluminum alloy material to blue having the feel of a material and gray having the feel of a material. SOLUTION: This coloration method for the aluminum and aluminum alloy consists in subjecting the aluminum and aluminum alloy material to anodic oxidation treatment and subjecting the material to intermediate electrolytic treatment to electrolytically treat the material in a bath mainly composed of an organic acid or inorganic acid these salts, then to electrolytic coloring treatment in a bath containing a metallic salt, followed by electrodeposition coating by a coating material containing white pigments of 0.6 to 2.4 wt.% by the weight of the resin solid component and 0.04 to 0.24 wt.% black pigment.