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 in 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 heat treatment is performed in an oxygen atmosphere to form a thermal oxide film on the surface of the aluminum material, a second stage where anode electrolysis is performed in an aqueous solution containing a monobasicacied and/or a salt tehreof, and a third stage where hydrochloric acid dipping treamtnet of dipping the aluminum material into a hydrochloric acid aqueous solution is performed.