Hot-dip Zn plated steel sheet excellent in luster-retaining property and method of producing the same

摘要

Degradation of the surface luster of a hot-dip Zn-Al-Mg plated steel sheet is inhibited by controlling the contact temperature between the plating layer and a water stream in a water cooling step after plating layer solidification, thereby suitably controlling the strip temperature during contact with the water stream, and further by incorporating a small amount of a suitable readily oxidizing element in the plating bath to stabilize the oxidation state of the plating surface layer Al and Mg.