Surface-treated steel sheet
US11084252B2 · kind B2 · utility
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3References
12Claims
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Key dates
| Filing date | Mar 1, 2018 |
| Grant date | Aug 10, 2021 |
| Priority date | — |
| Expiry date | Aug 10, 2038 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12937
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A surface-treated steel sheet according to an aspect of the present invention includes: a steel sheet as a base metal and a coating layer, in which the coating layer includes a Ni—Co alloy coating layer, a Ni—Fe alloy layer, and a Ni layer, in the coating layer, a total adhesion amount of Co is 0.2 g/m2 to 2.3 g/m2, and a total adhesion amount of Ni is 8.9 g/m2 or more, the Ni layer has a thickness of 0.3 μm to 3.0 μm, an atomic concentration of Co on a surface of the Ni—Co alloy coating layer is 20 at % to 70 at %, and a Co concentration gradient y in the coating layer in a depth direction is 50 mass %/μm to 400 mass %/μm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.