SURFACE TREATMENT METHOD FOR ALUMINUM MATERIAL AND SURFACE TREATED ALUMINUM MATERIAL

摘要

PROBLEM TO BE SOLVED: To provide a surface treatment method for an aluminum material by which 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 a hydrated oxide film is formed on the surface of the aluminum material, and a second stage where anode electrolysis is performed in an aqueous solution containing a monobasic acid and/or a salt thereof.