Birch, Stewart, Kolasch & Birch, LLP.
Surface-treated steel sheet
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.
NIPPON STEEL CORPORATION
H B C C C Y C H Y C C C C C C B H C C C H
H01M B32B C25D C22C C22C Y10T C22C H01M Y02E C22C C25D C22C C22C C25D C22C B32B H01M C22C C25D C25D H01M
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Kiyokazu Takehiro Mamoru
Ishizuka Takahashi Saito