| 摘要 |
PROBLEM TO BE SOLVED: To provide a Zn-Mg-based plated steel sheet which has excellent corrosion resistance and workability, and to provide a method for producing the same. SOLUTION: The surface of the Zn-Mg-based plated steel sheet is provided with a plating layer comprising 0.1 to 2.0% Al and 3.0 to 10.0% Mg, and the balance Zn with inevitable impurities, wherein the area ratio of Zn-Mg-based intermetallic compound phases other than intermetallic compounds in an eutectic structure exposed to the surface of the plating to the whole of the surface of the plating is 5 to 80%. Further, the hot dip Zn-Mg based plated steel sheet is obtained by performing plating treatment in a plating bath comprising, by mass, 0.1 to 2.0% Al, 3.0 to 10.0% Mg, and the balance Zn with inevitable impurities in such a manner that the temperature in the plating bath is made higher by 10 to 80°C than the liquidus temperature of the alloy having the composition in the plating bath, and then performing cooling from the liquidus temperature of the alloy having the composition in the plating bath to a prescribed temperature at a cooling rate of 1 to 100°C/s. COPYRIGHT: (C)2011,JPO&INPIT |
