| abstract |
PROBLEM TO BE SOLVED: To provide a surface treatment method for an aluminum material which is excellent in uniformity and reproducibility in surface gloss and color tone, and can give controlled surface gloss and color tone over a wide range. A method for treating a surface of an aluminum material made of aluminum or an aluminum alloy, wherein a first step of forming a hydrated oxide film on the surface of the aluminum material, A surface treatment method for an aluminum material, comprising a second step of performing anodic electrolysis in an aqueous solution containing a monobasic acid and / or a salt thereof, and a third step of performing a hydrochloric acid immersion treatment of immersion in a hydrochloric acid aqueous solution. |