Tinned steel sheet and method for producing the same

摘要

A tinned steel sheet includes an Sn-containing plating layer disposed on at least one surface of a steel sheet and in which mass per unit area of Sn is 0.05 to 20 g/m2; a first chemical conversion coating disposed on the Sn-containing plating layer and contains P and Sn, and in which mass per unit area of P is 0.3 to 10 mg/m2; a second chemical conversion coating disposed on the first chemical conversion coating and contains P and Al, and in which mass per unit area of P is 1.2 to 10 mg/m2 and mass per unit area of Al is 0.24 to 8.7 mg/m2; and a silane coupling agent-treating layer formed with the silane coupling agent disposed on the second chemical conversion coating and has a mass per unit area of Si of 0.10 to 100 mg/m2.

主权项

1. A tinned steel sheet comprising:
an Sn-containing plating layer that is substantially free of a tin oxide layer disposed on at least one surface of a steel sheet and in which the mass per unit area of Sn is 0.05 to 20 g/m2; a first chemical conversion coating disposed directly on the Sn-containing plating layer, which contains P and Sn, and in which the mass per unit area of P is 0.3 to 10 mg/m2; a second chemical conversion coating disposed on the first chemical conversion coating and contains P and Al, and in which mass per unit area of P is 1.2 to 10 mg/m2 and the mass per unit area of Al is 0.24 to 8.7 mg/m2; and a silane coupling agent-treating layer formed with the silane coupling agent disposed on the second chemical conversion coating and has a mass per unit area of Si of 0.10 to 100 mg/m2.