A steel plate plated with Pb Sn alloy for fuel tanks of automobile and process of production of the steel plate plated with Pb Sn alloy.

摘要

ABSTRACT OF THE DISCLOSUREA steel sheet plated with Pb-Sn alloy, suitablefor use as the material of automobile fuel tanks forcontaining fuel having alcoholic content. The steelsheet has an NiSn alloy layer or a composite layer includ-ing a backing Ni layer and the NiSn alloy layer; the NiSnalloy layer or the composite layer being formed on thesteel surface to have a thickness of 0.035 to 1 µ; and aplating layer of a Pb-Sn system alloy formed on the soleNiSn layer or the NiSn layer of the composite layer.The steel sheet plated with Pb-Sn alloy can be producedby plating the steel sheet with Ni backing, forming aPb-Sn system alloy layer by a hot dip coating, andrapidly cooling the steel sheet. Alternatively, thesteel sheet plated with Ni is subjected to successiveelectroplating with Sn and then with Pb, and is thentreated at a specific temperature for melting anddiffusing Sn into Ni to form the NiSn layer.