Tin-plated steel sheet

A tin-plated steel sheet comprising:

• a steel sheet;
• a plating layer containing tin on at least one surface of the steel sheet;
• and
• a chemical conversion coating consisting of P, O, H and tin on the plating layer in a coated amount of 1.0 to 50 mg/m2 in terms of P and having an atomic ratio Sn/P obtained from intensity of a P2p peak and that of a Sn3d peak of the chemical conversion coating in the range of 1.0 to 1.3,
• wherein 1) the intensities are measured at a surface of the chemical conversion coating with an x-ray photoelectron spectroscopic method, 2) an atomic ratio 0/P obtained from the intensity of the P2p peak and that of an O1s peak is in the range of 4.0 to 9.0, and optionally 3) a ratio IOHH/IPO between reflection-absorbance intensity of a PO bond (IPO) and reflection-absorbance intensity of an OH bond (IOH) of an infrared absorption spectrum of the chemical conversion coating is in the range of 0.18 to 0.30.

A tin-plated steel sheet comprising:

• a plating layer containing tin on at least one surface of a steel sheet;
• and
• a chemical conversion coating consisting of P, O, H and tin on the plating layer, wherein a coated amount of the chemical conversion coating per surface is 1.0 to 50 mg/m2 in terms of P, an atomic ratio Sn/P obtained from the intensity of a P2p peak and that of a Sn3d peak of the chemical conversion coating is in the range of 1.0 to 1.3, the intensities being measured at the surface thereof using an x-ray photoelectron spectroscopic method, and
• an atomic ratio 0/P obtained from the intensity of the P2p peak and that of an O1s peak is in the range of 4.0 to 9.0.