Patent ID: 9051654
Filing Date: 2015-06-09
Classification: C09D,C23C,Y10T

Abstract:
1. A galvanized steel sheet, comprising: a surface film on a surface of a galvanized layer on one or both sides of the steel sheet, the surface film having a two-layer structure including a first layer film and a second layer film, wherein the first layer film is formed by applying a surface treatment solution (A) having a pH of 8 to 10 onto the surface of the galvanized layer and drying the surface treatment solution (A) by heating, the surface treatment solution (A) containing a water-soluble zirconium compound (a), a tetraalkoxysilane (b), an epoxy group-containing compound (c), a chelating agent (d), a vanadate compound (e), and a metal compound (f) containing at least one selected from the group consisting of Ti, Al, and Zn so that conditions (I) to (V) below are satisfied, wherein the second layer film is formed by applying a surface treatment solution (B) containing an organic resin (h) onto a surface of the first layer film and drying the surface treatment solution (B) by heating, and wherein a total combined thickness of the first layer film and the second layer film on the surface of the galvanized layer is 0.1 to 3 μm on any side: