Surface-treated steel sheet, metal container, and method for manufacturing surface-treated steel sheet
AssigneeToyo Kohan Co., Ltd.
InventorsNaomi TAGUCHI, Akihiro YOSHIDA, Kenji YANADA
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Abstract
A surface-treated steel sheet including a tin-plated steel sheet having a tin plating on a steel sheet; a tin oxide layer formed on the tin-plated steel sheet and containing tin oxide as a main component; a composite oxide layer formed on the tin oxide layer and containing phosphoric acid and aluminum as main components; and an aluminum-oxygen compound layer formed on the composite oxide layer and containing an aluminum-oxygen compound as a main component, wherein the tin oxide layer has a thickness of 8 to 20 nm.
Claims8
A surface-treated steel sheet comprising:
- a tin-plated steel sheet having a tin plating on a steel sheet;
- a tin oxide layer formed on the tin-plated steel sheet and containing tin oxide as a main component;
- a composite oxide layer formed on the tin oxide layer and containing phosphoric acid and aluminum as main components;
- and
- an aluminum-oxygen compound layer formed on the composite oxide layer and containing an aluminum-oxygen compound as a main component,
- wherein the tin oxide layer has a thickness of 8 to 20 nm.
A method for manufacturing a surface-treated steel sheet comprising:
- a first step of providing a tin-plated steel sheet having a tin plating on a steel sheet;
- a second step of subjecting the tin-plated steel sheet to an electrolytic treatment in an electrolytic treatment solution containing phosphate ions with 0.1 C/dm2 or more and 1.0 C/dm2 or less of electricity;
- and
- a third step of subjecting the tin-plated steel sheet subjected to the electrolytic treatment in the second step to a cathode electrolytic treatment in an electrolytic treatment solution containing aluminum ions.
Dependencies are inferred from the claim text.