Surface Treated Steel Sheet

Abstract: Provided is a surface-treated steel sheet with which it is possible to obtain exceptional corrosion resistance, adhesion with respect to an adhesive, and blackening resistance, and furthermore to obtain exceptional condensation discoloration resistance. In a surface-treated steel sheet according to the present embodiment, a plating layer contains, in terms of mass%, more than 5.0% and less than 25.0% of Al, and more than 3.0% and less than 12.5% of Mg, the balance being 65.0% or more of Zn and impurities. A chemical conversion coating formed on the plating layer contains Zr, V, P, and Co, and an acrylic resin. The mass [V]mg/m2 of V and the mass [P]mg/m2 of P in the chemical conversion coating satisfy relationship (1), and the mass [V]mg/m2 of V and the Mg content [Mg]b mass% of the plating layer satisfy relationship (2). [Relationship (1)] 0.60=[V]/[P]=2.80; [Relationship (2)] 0<[V]/[Mg]b=20.00

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