A surface-treated metal plate, and a method for manufacturing a surface-treated metal plate

摘要

One aspect of the present invention is provided with a zinc-based plated steel sheet and a surface-treated film laminated on at least one surface of the galvanized steel sheet, wherein the surface-treated film includes a polyolefin-based resin that does not contain ammonia and an average It is composed of a surface treatment composition containing colloidal silica having a particle diameter of 4 to 6 nm, wherein the content of the colloidal silica is 10 parts by mass or more and less than 30 parts by mass with respect to 100 parts by mass of the surface treatment composition, the surface treatment The coating amount is 0.4 to 1.2 g/m ² , and the amount of sodium ions eluted from the surface-treated film when immersed in deionized water at 70 to 80° C. for 10 minutes is 4 mg/m ² or less.