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|1. (WO2018025651) SURFACE-TREATED METAL PLATE AND METHOD FOR PRODUCING SURFACE-TREATED METAL PLATE|
|Applicants:||KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.)
|Title:||SURFACE-TREATED METAL PLATE AND METHOD FOR PRODUCING SURFACE-TREATED METAL PLATE|
One aspect of the present invention is a surface-treated metal plate which comprises a galvanized steel sheet and a surface treatment coating film that is laminated on at least one surface of the galvanized steel sheet, and wherein: the surface treatment coating film is configured from a surface treatment composition that contains colloidal silica having an average particle diameter of 4-6 nm and a polyolefin resin containing no ammonia; the content of the colloidal silica is 10 parts by mass or more but less than 30 parts by mass relative to 100 parts by mass of the surface treatment composition; the coating amount of the surface treatment coating film is 0.4-1.2 g/m2; and the amount of sodium ions released from the surface treatment coating film when immersed in a deionization water at 70-80°C for 10 minutes is 4 mg/m2 or less.