| 简介 |
PROBLEM TO BE SOLVED : To provide a magnesium-alloy sheet excellent in surface property.
SOLUTION : The magnesium-alloy sheet having excellent surface treatability is obtained by suitably subjecting a magnesium-alloy molten metal having a composition comprising, by mass, 1-11% Al, 0.1-2.0% Zn, 0.15-0.5% Mn and further, as necessary, further comprising 0.05-2% one or more kinds selected from Ca, Sr, RE, and the balance Mg with inevitable impurities in which the contents of Fe, Ni, Co and Cu are regulated to <50 ppm and the content of Cl is regulated to <20 ppm, to continuous casting, and rolling into a belt-like magnesium alloy sheet metal which is used as a substrate, and making the substrate thin by plastic working such as rolling. Further, Al-Mn compound present on the surface layer part in the sheet thickness satisfies the atomic ratio Mn/Al <1.0 and the maximum size is <10 μm, and suitably, further, the occupied area of the Al-Mn compound on the surface in the sheet thickness, is <5.0%.
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