VAPOR DEPOSITED ZINC-MAGNESIUM ALLOY PLATED STEEL SHEET HAVING EXCELLENT ADHESION PROPERTY AND ITS MANUFACTURE

摘要

PURPOSE: To manufacture a vapor deposited Zn-Mg alloy plated steel sheet having an excellent adhesion property by forming a Zn-Fe alloy layer having a specific Fe concn. at the boundary between substrate steel and a Zn-Mg alloy plating layer. ;CONSTITUTION: Zn is deposited by evaporation at deposition of 0.03g/m² on the continuously traveling steel sheet and further, vapor deposition of Mg and vapor deposition of Zn are independently and successively executed. This steel sheet is then subjected to a heat treatment i a temp. range of 270 to 370°C and the Zn-Fe alloy layer (its thickness is preferably about 0.01 to 0.5μm) having ≥6wt.% Fe concn is formed at the boundary between the substrate steel and the Zn-Mg alloy layer. As a result, the vapor deposited Zn-Mg alloy plated steel sheet having the improved adhesion property and workability is obtd.;COPYRIGHT: (C)1996,JPO