| 摘要 |
PURPOSE:To improve corrosion resistance, adhesion, and workability of the titled plated steel sheet obtained, by incorporating >=one kind among Mg, Na, Ca, and Ba to a Zn-Al alloy plating film containing specific amounts of Al and by limiting the particle size of an alpha phase dispersed in a beta phase of the above film. CONSTITUTION:The titled steel sheet is a hot-dipped steel sheet plates with a Zn-Al alloy plating film containing 2-10wt% Al, which contains >=one kind among Mg, Na, Ca, and Ba in the above film and in which the particle size of the granular alpha phase dispersed in the beta phase of the film is limited to the following range: 1/20-1/4 of the plating film thickness. In this case, it is preferable to contain only Mg among Mg, Na, Ca and Ba in the range of >=5%-<1.0%, and furthermore, it is more preferable to contain >=one kind among Na, Ca, Ba in the range of 0.1<Na+(Ca/3)+Ba<0.2.
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