Patent ID: 8852753
Filing Date: 2014-10-07
Classification: C23C,Y10T

Abstract:
1. A galvanized steel sheet comprising: a steel sheet; and a galvanizing layer in an amount of not less than 20 g/m wherein the galvanizing layer includes an amorphous coating layer having an inorganic oxoacid salt and metallic oxide on a surface layer of the galvanizing layer; the inorganic oxoacid salt includes oxygen acid salts containing P; the metallic oxide includes: the galvanizing layer includes a ζ phase and a δ the galvanizing layer includes, by mass, 8 to 13% of Fe; Zn in the metallic oxide exists up to an outermost surface layer of the amorphous layer; 50% or more of Zn by atomic percent existing in the outermost layer of the amorphous coating layer is present as a chemical compound of phosphorus-containing oxoacid and zinc; and an X-ray diffraction intensity ratio I, which is obtained by dividing an X-ray diffraction intensity of the ζ phase at d=0.126 nm, after removing background intensity, by an X-ray diffraction intensity of the δ 1 phase at d=0.127 nm, after removing background intensity, is 0.06 to 0.35.