| 摘要 |
PROBLEM TO BE SOLVED: To obtain an aluminum alloy anodic oxidation treated sheet which has a gray color tone even in the case of a thin anodic oxidation film, and in which surface luster is suppressed, and which can be suitably subjected to forming such as bending after anodic oxidation treatment. SOLUTION: In the aluminum alloy anodic oxidation treated sheet having a gray color, 10<SP>6</SP>pieces/mm<SP>2</SP>or more of Al-Mn based intermetallic compound grains with the diameter of the equivalent circle of 0.03 to 1.0μm are dispersed into a base material containing 0.9 to 2.0% Mn or further containing 0.05 to 6.0% Mg. The area ratio thereof is≥1.8%, and is also larger than the area ratio of Al-Mn based intermetallic compound grains with a size exceeding the diameter of the equivalent circle of >1.0μm. An anodic oxidation film with a thickness of 0.7 to 7.0μm is formed on the surface thereof, and its luster is suppressed so as to satisfy a 60°specular reflectivity of≤52%. The base material can comprise specified amounts of Ti, Cr, Zr, and V as well. COPYRIGHT: (C)2004,JPO
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