METHOD FOR MANUFACTURING GALVANIZED STRIP EXCELLENT IN CORROSION RESISTANCE, FILM ADHESION PROPERTY, PAINT PRIMER PROPERTY AND LOW TEMPERATURE DRYING PROPERTY TO OBTAIN SUPERIOR SURFACE OF THE STRIP

摘要

PURPOSE: To provide a method for manufacturing galvanized strip, wherein a composition that is environmentally friendly and not harmful to the human body is prepared to prevent various phenomena generated in a conventional chrome solution so that the galvanized strip having high quality is manufactured by maintaining excellent corrosion resistance and film adhesion property on the surface of the galvanized strip. CONSTITUTION: The method comprises the process of drying the galvanized strip treated with the composition after treating a galvanized strip with a surface treatment composition for galvanized strip, wherein the surface treatment composition for galvanized strip comprises, on the solid weight basis of the composition, 30 to 80 wt.% of mixed resin in which water soluble organic resin and inorganic resin are mixed in a solid ratio of 70:30 to 30:70, 10 to 40 wt.% of phosphate based corrosion resistant anticorrosive of metal oxides, and 1 to 20 wt.% of organic resin complex compound, wherein the water soluble organic resin is selected from water soluble or water-dispersible acryl polymer resin or epoxy resin having one or more of hydroxyl group, carboxyl group and a mixture thereof, the inorganic resin is selected from one or more of alumina sol, silica sol, titania sol and zirconia sol, the phosphate based corrosion resistant anticorrosive of metal oxides is selected from one or more selected from a phosphate solution of aluminum, manganese, zinc, molybdenum and fluorine, a phosphoric acid solution of hexaammonium heptamolybdate tetrahydrate, and a phosphate solution of soda, and the organic resin complex compound is selected from one or more selected from silane based coupling agent, titanium based coupling agent and zirconium based coupling agent.