| 摘要 |
PROBLEM TO BE SOLVED: To provide an insulating substrate in which a uniform anodic oxidation coating is formed at the surface of the plating layer of an Al-alloy-plated steel sheet, and to provide its manufacturing method. SOLUTION: In the insulating substrate, an Al-Zn alloy, having a composition consisting of, by mass, 40-60% Al, <=2% Si with inevitable impurities, and the balance Zn, is used as an Al alloy for the plated steel sheet. This insulating substrate can be manufactured by immersing the Al-Zn alloy plated steel sheet as above in an aqueous solution of pH 5.0-10.0 containing alkali salt of weak acid to undergo continuous anodic oxidation.
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