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LIQUIDE DE TRAITEMENT DE SURFACE POUR TÔLE EN ACIER GALVANISÉ, PROCÉDÉ DE PRODUCTION D'UNE TÔLE EN ACIER GALVANISÉ POURVUE D'UN FILM DE TRAITEMENT DE SURFACE, ET TÔLE EN ACIER GALVANISÉ AINSI OBTENUE
LIQUIDE DE TRAITEMENT DE SURFACE POUR TÔLE EN ACIER GALVANISÉ, PROCÉDÉ DE PRODUCTION D'UNE TÔLE EN ACIER GALVANISÉ POURVUE D'UN FILM DE TRAITEMENT DE SURFACE, ET TÔLE EN ACIER GALVANISÉ AINSI OBTENUE
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摘要
Disclosed is a surface-treatment solution for producing a zinc or zinc alloy coated steel sheet with a surface-coating layer that does not contain a chromium compound in the surface-coating layer and that is excellent in all of heat discoloration resistance, heat cracking resistance, planar part anti-corrosion property, corrosion resistance after alkali degreasing, blackening resistance, stack blackening resistance, anti-water stain property, solvent resistance, perspiration resistance, coating adhesion property, and storage stability. The disclosed surface-treatment solution contains a glycidyl group-containing silane coupling agent (A), a tetraalkoxysilane (B), a zirconium carbonate compound (C), and an anionic polyurethane resin (D) having a glass transition temperature (Tg) of 80 °C to 130 °C, a vanadium compound (E), a molybdic acid compound (F), and water, the surface-treatment solution having a pH of 8.0 to 10.0, and the amount of each component satisfying a predetermined relationship.
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