| 摘要 |
PROBLEM TO BE SOLVED: To provide a hot dip Zn-Sn plated steel sheet having excellent corrosion resistance and applicable to an automobile body and a building material such as a roof material and a wall material. SOLUTION: In this hot dip Zn-Sn plated steel sheet excellent in corrosion resistance, the surface of the steel sheet has a hot dip Zn-Sn plated layer, the composition of the plated layer contains 1 to <50%, preferably, 1 to <40% Sn in addition to Zn. Further, the hot dip Zn-Sn plated steel sheet excellent in corrosion resistance contains 1 to 25% Cr in the steel. Moreover, the average value of the coating weight is 25 to 100 g/m2 per side, and the standard deviation is <=4 g/m2. Further, the composition of the plated layer contains one or more kinds of elements selected from 0.2 to 8% Mg and 0.02 to 5% Al in addition to Zn and Sn and moreover contains one or more kinds of elements selected from 0.1 to 5% Ca and 0.1 to 5% Li. Further, the boundary between the plated layer and the steel sheet is provided with a preplated layer containing Ni, Co, Fe, Cr, Sn, Zn and Cu, or the outermost surface of the plated layer is provided with a posttreated film.
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