Surface Treated Steel Sheet

Abstract: Provided is a surface-treated steel sheet comprising a Zn-Al-Mg plated steel sheet having a plating amount of 20-60 g/m2 per one surface and a coating film disposed on at least one main surface of the Zn-Al-Mg plated steel sheet, wherein the coating film comprises a binder resin, doped zinc oxide particles, and a rust preventive, the coating film has an average film thickness of 0.5-3 µm, the doped zinc oxide particles have an average particle diameter of 0.1-2 µm, the content of the doped zinc oxide particles is 20-40 mass% with respect to the coating film, and the content of inorganic substances other than any Zn-containing compounds in the coating film is 0-1 mass% with respect to the coating film.

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