SURFACE-TREATMENT LIQUID FOR GALVANIZED SHEET STEEL, GALVANIZED SHEET STEEL, AND MANUFACTURING METHOD THEREFOR

摘要

The disclosed galvanized sheet steel not only excels in appearance and corrosion resistance after press forming, but also retains oil well in high-temperature and high-temperature/high-humidity environments. Said galvanized sheet steel has a film on the surface thereof, with between 10 and 200 mg/m² of attached zirconium. Said film is obtained by applying a surface-treatment liquid and then drying said surface-treatment liquid by heating. Said surface-treatment liquid contains the following in a specific ratio: a water-soluble zirconium compound (A); water-dispersible microparticulate silica (B); a silane coupling agent (C); a vanadic acid compound (D); a phosphoric acid compound (E); a nickel compound (F); an acrylic resin emulsion (G); and an organopolysiloxane compound (H).