| 摘要 |
THERE IS PROVIDED A CHROME-FREE RESIN COMPOSITION FOR SURFACE-TREATING A STEEL SHEET HAVING EXCELLENT CORROSION RESISTANCE, ALKALINE RESISTANCE, PROCESSIBILITIES AND CONDUCTIVITY, CHEMICAL RESISTANCE, A METHOD FOR MANUFACTURING A STEEL SHEEL USING THE SAME, AND A SURFACE-TREATED STEEL SHEET MANUFACTURED ACCORDING TO THE METHOD. THE SURFACE-TREATED STEEL SHEET IS PREPARED BY COATING A STEEL SHEET WITH A RESIN COMPOSITION INCLUDING A MIXTURE OF SOFT URETHANE RESIN AND HARD URETHANE RESIN; A TI OR ZR-BASED ORGANIC OXIDE; AT LEAST ONE COMPOUND SELECTED FROM THE GROUP CONSISTING OF MONOALUMINUM PHOSPHATE, ALUMINUM DIHYDROGEN PHOSPHATE, MONOZINC PHOSPHATE AND HYDRATED MANGANESE PHOSPHATE; AND A SOLVENT, WHEREIN, AFTER THE DRYING OF THE STEEL SHEET, AN AMOUNT OF THE RESIN COMPOSITION ATTACHED TO THE STEEL SHEET IS IN A RANGE OF 300 TO 1,800 MG/M2, WHEREIN THE URETHANE RESIN MIXTURE IS PRESENT IN A CONTENT OF 10 TO 90% BY WEIGHT, THE TI OR ZR-BASED ORGANIC OXIDE IS PRESENT IN A CONTENT OF 1 TO 20% BY WEIGHT, AND THE AT LEAST ONE COMPOUND SELECTED FROM THE GROUP CONSISTING OF MONOALUMINUM PHOSPHATE, ALUMINUM DIHYDROGEN PHOSPHATE, MONOZINC PHOSPHATE AND HYDRATED MANGANESE PHOSPHATE IS PRESENT IN A CONTENT OF 0.1 TO 10.0% BY WEIGHT, BASED ON THE TOTAL SOLID CONTENT OF THE RESIN COMPOSITION, AND THE SOFT URETHANE RESIN IS PRESENT IN A CONTENT OF 5 TO 95% BY WEIGHT, AND THE HARD URETHANE RESIN IS PRESENT IN A CONTENT OF 5 TO 95% BY WEIGHT, BASED ON THE TOTAL AMOUNT OF THE URETHANE RESIN MIXTURE.
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