| 摘要 |
PROBLEM TO BE SOLVED: To provide an aluminum alloy capable of forming a satin surface of a light gray color by alkali etching treatment and anodic oxidation treatment by the conventional methods. SOLUTION: An aluminum alloy having an alloy composition for extrusion molding in which Mg, Si, Fe, or the like are added and incorporated and moreover containing Sn of 0.3 to 0.8 wt.% is prepared, and the extruded shape material thereof is subjected to aging treatment, is thereafter subjected to the conventional alkali etching treatment to form a fine and uniform satin surface and is subjected to anodic oxidation treatment to enable the developing of a light gray color by the diffused reflection and refraction of light.
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