BLANK FOR WELDED CAN HAVING EXCELLENT HIGH SPEED SEAM-WELDABILITY, CORROSION RESISTANCE, HEAT RESISTANCE AND COATING ADHESION

• Main Authors: KATAYAMA TOSHINORI, HIRANO SHIGERU, ICHIKAWA TAKASHI, OGA TOMOYA
• Format: Patent
• Language: English
• Published: 26.04.1994
• Edition: 5
• Subjects: APPARATUS THEREFOR; CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; ELECTROFORMING; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; METALLURGY; PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION

PURPOSE:To develop a blank for welded can having excellent high speed seam- weldability, corrosion resistance, heat resistance and coating adhesion by forming Ni plating layer on the surface of a steel sheet and further, forming an Sn plating layer with SN grains spotted and chromate film on this surface. CONSTITUTION:After activating and cleaning the surface of the cold-rolled and annealed steel sheet by pre-treatment of alkali electrolytic degreasing, electrolytic pickling, etc., the electric plating of Ni is executed at 2-150mg/m of the steel sheet. Further, on this surface, the Sn plating in which the Sn grain having 0.2-12.0mum grain diameter is spotted is applied at the ratio of 10-2800mg/m and finally, on this surface, the chromate film having 1-50mg/m expressed in terms of Cr is formed. The steel sheet having excellent high speed sea-weldability, corrosion resistance and coating adhesion as the blank for welded can and which can be baked at a high temp. in a short time and having <=0.20mm thickness is obtd.