Patent ID: 6749952
Filing Date: 2004-06-15
Classification: C23C,C25D,Y10T

Abstract:
A tin-plated steel sheet comprising:a base steel sheet; a tin plating layer coating approximately more than 97.0% of the base steel sheet; an alloy layer comprises at least one layer selected from the group consisting of a Feâ€”Sn alloy layer, a Feâ€”Ni alloy layer, a Snâ€”Ni alloy layer, and a Feâ€”Snâ€”Ni alloy layer disposed on the base steel sheet and at least beneath the tin plating layer; and a chemical conversion coating having approximately 0.5 to 100 mg/m2 phosphorus and approximately 0.1 to 250 mg/m2 silicon, wherein the silicon is derived from a silane coupling agent, but exclusive of chromium, formed on the tin plating layer and an unplated region corresponding to less than 3.0%, wherein the alloy layer comprises a composite alloy layer comprising a Feâ€”Ni alloy layer having a mass ratio Ni/(Fe+Ni) in the range of approximately 0.02 to 0.50 and a Feâ€”Snâ€”Ni alloy layer disposed on the Feâ€”Ni alloy layer.