Molten Zn-Al-based alloy-plated steel sheet having excellent corrosion resistance and workability, and method for producing same

摘要

A molten Zn-Al-based alloy plating layer is formed on the surface of a steel sheet by dipping a steel sheet in a molten Zn-Al-based alloy plating bath, which contains, in terms of mass %, 3 to 6% of Al, 0.2 to 1.0% of Mg and 0.01 to 0.10% of Ni and in which the content of Fe is adjusted to 0.10% or less, and then withdrawing and cooling the steel sheet. Here, by adjusting so that the bath temperature of the plating bath is 420 to 520°C and the temperature of the steel sheet dipped into the plating bath is 420 to 600°C and not lower than the bath temperature of the plating bath, a molten Zn-Al-based alloy-plated steel sheet is formed which has excellent workability and corrosion resistance, which has an Fe content in the plating layer of 2.0 g/m