SURFACE TREATMENT COMPOSITION FOR TERNARY HOT DIP GALVANIZED STEEL SHEET, SURFACE-TREATED TERNARY HOT DIP GALVANIZED STEEL SHEET USING SAME AND PREPARATION METHOD THEREOF

摘要

An object of the present invention is to provide a surface treatment composition capable of imparting excellent corrosion resistance, blackening resistance, alkali resistance and intrinsic surface color characteristics to a ternary hot-dip zinc alloy plated steel sheet. The present invention is based on 100% by weight of the solid content of the composition, 70 to 90% by weight of a resin mixture comprising a high molecular weight polysilicon-modified polyurethane main resin, a low molecular weight polysilicon-modified polyurethane auxiliary resin, and an acrylic-urethane auxiliary resin; 5 to 25% by weight of a melamine-based curing agent; 0.5 to 10% by weight of inorganic additives; 0.5 to 10% by weight of a silane coupling agent; Adhesion enhancer 0.1 to 2% by weight; 0.1 to 2% by weight of a coloring pigment; And it provides a surface treatment composition comprising 0.1 to 1% by weight of a pigment stabilizer.