| 摘要 |
PROBLEM TO BE SOLVED: To provide an aluminum alloy sheet excellent in surface quality after anodic oxidation treatment, in which a fir tree structure is not generated in the sheet surface after anodic oxidation treatment.SOLUTION: Provided is an aluminum alloy sheet having a composition comprising, by mass, 0.2 to 0.7% Fe, and the balance Al with inevitable impurities, and in which an anodic oxidation treatment film is formed, in which the Fe element in a solid solution state is taken into the film, and the concentration difference in the solid-soluted Fe element in the sheet width direction is 0.02 wt.% or lower. The aluminum alloy sheet may further comprise one or two kinds selected from Mg: 1.2% or lower and Si: 0.3% or lower. |
