SURFACE-TREATMENT SOLUTION FOR ZINC OR ZINC ALLOY COATED STEEL SHEET, ZINC OR ZINC ALLOY COATED STEEL SHEET WITH SURFACE-TREATMENT FILM AND METHOD OF PRODUCING SAME

摘要

Provided is a surface-treatment solution for obtaining a zinc or zinc alloy coated steel sheet with a surface-treatment film: that does not contain any chromium compounds in the surface-treatment film, and, needless to say, has excellent corrosion resistance in flat portions, blackening resistance and water staining resistance; and has excellent resistance to darkening, resistance to flake-like peeling, and resistance to corrosion even after being subjected to severe ironing such as continuous high speed press forming. This surface-treatment solution for a zinc or zinc alloy coated steel sheet: is characterized by containing a zirconium carbonate compound (A), a phosphate compound (B), hydroxy carboxylic acid (C), tetra-alkoxysilane (D), a silane coupling agent (E) having an epoxy group, a vanadate compound (F), and a nickel compound (G); and is further characterized in that the contents of (A) to (G) are adjusted so as to satisfy specific conditions.