| 摘要 |
<p>A TINNED STEEL SHEET INCLUDES AN SN-CONTAINING PLATING LAYER WHICH IS DISPOSED ON AT LEAST ONE SURFACE OF A STEEL SHEET AND IN WHICH THE MASS PER UNIT AREA OF SN IS 0.05 TO 20 G/M2; A FIRST CHEMICAL CONVERSION COATING WHICH IS DISPOSED ON THE SN-CONTAINING PLATING LAYER, WHICH CONTAINS P AND SN, AND IN WHICH THE MASS PER UNIT AREA OF P IS 0.3 TO 10 MG/M2; A SECOND CHEMICAL CONVERSION COATING WHICH IS DISPOSED ON THE FIRST CHEMICAL CONVERSION COATING, WHICH CONTAINS P AND AL, AND IN WHICH THE MASS PER UNIT AREA OF P IS 1.2 TO 10 MG/M2 AND THE MASS PER UNIT AREA OF AL IS 0.24 TO 8.7 MG/M2; AND A SILANE COUPLING AGENT-TREATING LAYER WHICH IS DISPOSED ON THE SECOND CHEMICAL CONVERSION COATING AND IN WHICH THE MASS PER UNIT AREA OF SI IS 0.10 TO 100 MG/M2. THE STEEL SHEET CAN SUPPRESS THE DETERIORATION OF APPEARANCE AND THE REDUCTION OF PAINT ADHESION DUE TO THE SURFACE OXIDATION OF A TIN PLATING LAYER WITHOUT USING CR AND WHICH CAN BE SUBJECTED TO CHEMICAL CONVERSION AT LOW COST.</p> |
