Galvanized steel sheet

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:
• (I) a ratio (aZr/b) of the mass (aZr) of the water-soluble zirconium compound (a) in terms of Zr to the mass of the tetraalkoxysilane (b) is 1.0 to 6.0,
• (II) a ratio (b/cS) of the mass of the tetraalkoxysilane (b) to the mass of a solid (cS) of the epoxy group-containing compound (c) is 0.1 to 1.6,
• (III) a ratio (b/cS) of the mass of the tetraalkoxysilane (b) to the mass of a solid (dS) of the chelating agent (d) is 0.3 to 2.0,
• (IV) a ratio (eV/dS) of the mass (eV) of the vanadate compound (e) in terms of V to the mass of a solid (dS) of the chelating agent (d) is 0.03 to 1.0, and
• (V) a ratio (fM/dS) of the total metal mass (fM) of the metal compound (f) to the mass of a solid (dS) of the chelating agent (d) is 0.05 to 0.8.