| 摘要 |
PROBLEM TO BE SOLVED: To provide a surface treatment method for an aluminum material by which rolling impressions, extrusion impressions, or the like, on formation of a stock are eliminated, and further, surface luster and color tones which are enough in uniformity and reproducibility, and controlled over wide ranges can be imparted thereto. SOLUTION: The surface treatment method for the aluminum material consisting of aluminum or an aluminum alloy includes a first stage where anodic oxidation is performed in an aqueous solution containing a polyactic acid and/or a salt tehreof, and an anodic oxide film is formed on the surface of the aluminum material, a second stage where anode electrolysis is performed in an aqueous solution containing a monobacic acid and/or a salt tehreof, and a third stage where hydrochloric acid dipping treatment of dipping the aluminum material into a hydrochloric acid aqueous solution is performed.
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