SURFACE-TREATED, ZINC-PLATED STEEL SHEET HAVING EXCELLENT RESISTANCE TO TAPE PEELING, METHOD FOR PRODUCING SAME, AND SURFACE TREATMENT AGENT

摘要

A surface-treated, zinc-plated steel sheet is disclosed in which at least a surface modification layer and a coating film are formed on a zinc-plating layer of a zinc-plated steel sheet. The surface modification layer contains, in terms of Si, 1-30 mg/m2 of SiO2, 0.5- 15 mg/m2 of P and 0.4-10 mg/m2 of Al. The surface- treated, zinc-plated steel sheet is a non-chromate treated steel sheet, and particularly exhibits excellent resistance to tape peeling even after alkaline degreasing. A method for producing such a surface-treated, zinc- plated steel sheet and a surface treatment agent are also disclosed.