Surface Treated Steel Sheet

Abstract: This surface-treated steel sheet comprises: a base-material steel sheet; a plating layer formed on a surface of the base-material steel sheet; and a coating film formed on a surface of the plating layer. The plating layer has a Zn concentration between 40 mass% and 100 mass% inclusive, and has an Mg concentration between 0 mass% and less than 4.0 mass%. Between the interface and the center in the thickness direction between the interface and the surface, a maximum concentration of Ti in mass%, a maximum concentration of Zr in mass%, and a maximum concentration of V in mass% satisfy a predetermined relationship. In addition, an average concentration of C in mass% at the central part of the coating film, a maximum concentration of Mg in mass% in the boundary region of the coating film, an average concentration of Mg in mass% at the central part of the coating film, a maximum concentration of F in mass% in the boundary region of the coating film, an average concentration of F in mass% at the central part of the coating film, and an average concentration of Si in mass% at the central part of the coating film satisfy a predetermined relationship.

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