Patent ID: 11859289
Assignee: NIPPON STEEL CORPORATION
Field: Surface technology, coating (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 0:
1. A Sn-based plated steel sheet comprising:
a steel sheet;
a Sn-based plating layer located on at least one surface of the steel sheet; and
a coating layer located on the Sn-based plating layer, wherein:
the Sn-based plating layer contains 0.10 g/m2 or more and 15.00 g/m2 or less of Sn per side in terms of metal Sn;
the coating layer contains a zirconium oxide and a manganese oxide;
a content of the zirconium oxide in the coating layer is 0.20 mg/m2 or more and 50.00 mg/m2 or less per side in terms of metal Zr;
a content of the manganese oxide in terms of metal Mn in the coating layer is 0.01 times or more and 0.50 times or less on a mass basis relative to the content of the zirconium oxide in terms of metal Zr; and
a depth position A where an element concentration of Mn existing as the manganese oxide is maximum is located on a side closer to a surface of the coating layer than a depth position B where an element concentration of Zr existing as the zirconium oxide is maximum, and a distance in a depth direction between the depth position A and the depth position B is 2 nm or more in an element analysis in the depth direction by X-ray photoelectron spectroscopy.