| 摘要 |
PURPOSE:To prevent unfavorable elution of tin to the uppermost layer of welded and coated can, by successively executing (partially-Ni-substituted) tin-iron alloy plating, tin plating, chromium-base protective layer treatment and a specific epoxy-phenol-base coating on the can. CONSTITUTION:A steel sheet 1 subjected to coating surface treatment consists of both a surface-treated steel sheet 13 which is constituted of a steel substrate 10, a plated tin layer 11 provided on the steel substrate and a protective chromium layer 12 provided on the plated tin layer and an epoxy-phenol-base film 14 provided on the surface thereof. For reducing amount of tin tin-iron alloy layer or tin-iron alloy layer 15 partially substituted with nickel is preferably utilized in between the steel substrate 10 and the plated tin layer 11. As the epoxy-phenol-base paint, paint having a range within 400-5,000 epoxy equivalent is preferably used. Thereby generation of stain-like corrosion especially in a neck in processing part can be effectively prevented.
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