Surface-treated steel sheet

Abstract

A surface-treated steel sheet according to one embodiment of the present invention includes a base steel sheet and a plating layer containing Ni and W which is provided on the surface of the base steel sheet, and in a region from the outmost surface of the plating layer to a depth of 150 nm, a proportion (unit atomic %) of the average W concentration with respect to a total of the average Ni concentration, the average W concentration, and the average Fe concentration is 2.0 to 20.0 atomic %, and in a region of the plating layer from a depth of 150 nm to a depth of 300 nm, the proportion (unit atomic %) of the average W concentration with respect to the total of the average Ni concentration, the average W concentration, and the average Fe concentration is 0.7 times or less the proportion in the region from the outmost surface of the plating layer to a depth of 150 nm.

Dependencies are inferred from the claim text.