| 摘要 |
PURPOSE: To provide a galvanized steel sheet having an excellent plating adhesion property and a process for producing this galvanized steel sheet having the excellent plating adhesion property with a molten zinc bath of the same Al concn. as the Al concn. of galvannealing. CONSTITUTION: This galvanized steel sheet has an Fe-Al-Zn alloy layer contg. >=0.01 to >=0.1wt.% P at >=0.01 to <=2g/m<2> at the boundary between the plating layer and the steel sheet. The steel sheet surfaces are cleaned prior to annealing and thereafter, the steel sheet surfaces are coated with an inorg. phosphoric acid compd. at a thickness of >=0.001 to <=1g/m<2> terms of coating weight of P in this process for producing the galvanized steel sheet. The steel sheet surfaces are coated with the mixture of metals consisting of one or >=2 kinds of Mn, Mg, Zn, Fe and Al as the inorg. metallic compd.
|
