COMPOSITION FOR SPRAY COATING SURFACE TREATMENT, METHOD FOR PRODUCING SURFACE-TREATED HOT-DIP GALVANIZED STEEL SHEET, AND THE SURFACE-TREATED HOT-DIP GALVANIZED STEEL SHEET

摘要

PROBLEM TO BE SOLVED: To provide an environmentally compatible composition for surface treatment, which does not contain hexavalent chromium at all and can exhibit sufficient corrosion resistance and coating film appearance (finishing state) in the case when it is applied to the surface of a hot-dip galvanized steel sheet by a spray coating method to form a surface treatment coating film on the surface.

SOLUTION: The composition for spray coating surface treatment includes: a specific titanium-containing aqueous liquid (A); a nickel compound (B); a fluorine-containing compound (C); an organic phosphoric acid compound (D); a vanadic acid compound (E); and a zirconium carbonate compound (F), by a prescribed amount each, has a pH within the range of 7-10, and contains no resin component. The composition is used for forming a surface treatment coating film by being applied to at least one surface of a hot-dip galvanized steel sheet by a spray coating method.

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