| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an aluminum alloy plate which is suppressed in occurrence of streak patterns about the center of the plate thickness during anodization and its production method.SOLUTION: An aluminum alloy plate comprises 2.2-5.5 mass% Mg and 0.08-0.35 mass% Cr and remaining Al and unavoidable impurities, with the content of Ti restricted to 300 mass ppm or lower, that of V to 200 mass ppm or lower, that of B to 50 mass ppm or lower, that of Zr to 50 mass ppm or lower and that of Mo to 50 mass ppm or lower. For each of Ti, V, B, Zr and Mo, with the concentration in the plate-thickness front layer part taken as Cs mass ppm and the concentration in the plate-thickness central part taken as Cc mass ppm, Cs and Cc meet the condition (1) 1≤Cc/Cs≤3. A production method of the aluminum alloy plate is also provided.</p> |
