MATERIAL FOR WELDED CAN EXCELLENT IN HIGH-SPEED SEAM WELDABILITY, RESISTANCE TO CORROSION AND HEAT AND COATING ADHESION

• Main Authors: KATAYAMA TOSHINORI, HIRANO SHIGERU, ICHIKAWA TAKASHI, OGA TOMOYA
• Format: Patent
• Language: English
• Published: 08.03.1994
• 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 produce a material for the welded can excellent in high-speed seam weldability, resistances to corrosion and heat and coating adhesion by successively forming an Ni-Fe alloy plating layer, an Sn plating layer and a chromate coating film on the surface of a steel sheet under specified conditions. CONSTITUTION:An Ni-Fe alloy plating layer (contg. about 10-80wt.% Fe) or an Ni-P alloy plating layer (contg. about 0.1-10wt.% P) is formed on the surface of a steel sheet at 150-2500mg/m per side. An Sn plating layer, in which the Sn plating grains having 0.2-12.0mum diameter are interspersed at 400-2800mg/m , is formed on the plating layer, and further, a chromate coating film is formed on the Sn plating layer at 1-50mg/m expressed in terms of chromium. When the coated material is baked at high temp. for a short time and then high-speed seam welded, a material for the welded can having a sufficiently wide appropriate welding range and excellent in coating adhesion and corrosion resistance after coating is obtained.