US 12,270,109 B2
Surface-treated steel sheet and method for manufacturing the same
Yuji Nakano, Kudamatsu (JP); Daisuke Matsushige, Kudamatsu (JP); and Koh Yoshioka, Kudamatsu (JP)
Assigned to TOYO KOHAN CO., LTD., Tokyo (JP)
Appl. No. 16/759,204
Filed by TOYO KOHAN CO., LTD., Tokyo (JP)
PCT Filed Oct. 26, 2018, PCT No. PCT/JP2018/039995
§ 371(c)(1), (2) Date Apr. 24, 2020,
PCT Pub. No. WO2019/083044, PCT Pub. Date May 2, 2019.
Claims priority of application No. 2017-208584 (JP), filed on Oct. 27, 2017.
Prior Publication US 2020/0321566 A1, Oct. 8, 2020
Int. Cl. C25D 5/12 (2006.01); B32B 15/01 (2006.01); C23C 28/02 (2006.01); C25D 5/00 (2006.01); C25D 5/50 (2006.01); H01M 50/119 (2021.01); H01M 50/124 (2021.01); H01M 50/128 (2021.01); H01M 50/174 (2021.01)
CPC C23C 28/02 (2013.01) [B32B 15/011 (2013.01); C23C 28/021 (2013.01); C25D 5/12 (2013.01); C25D 5/50 (2013.01); C25D 5/605 (2020.08); H01M 50/119 (2021.01); H01M 50/1243 (2021.01); H01M 50/128 (2021.01); H01M 50/182 (2021.01)] 7 Claims
OG exemplary drawing
 
1. A surface-treated steel sheet, comprising:
a steel sheet; and
a nickel-cobalt-iron diffusion layer formed as an outermost surface layer on the steel sheet,
wherein when a content of Ni, a content of Co and a content of Fe of the nickel-cobalt-iron diffusion layer are determined based on a Ni intensity, a Co intensity and a Fe intensity each sequentially measured in the depth direction from the surface side of the nickel-cobalt-iron diffusion layer by a radio frequency glow discharge optical emission spectrometry, a content of Co at a specific depth position D, InCo_D, is 8.59% by mass or higher and 65% by mass or lower, a content of Fe at the specific depth position D, InFe_D, is 18% by mass or higher and 70% by mass or lower, a content of Ni at the specific depth position D, InNi_D is 5% by mass or higher and 34.55% by mass or lower, the specific depth position D being a position where the Ni intensity is 0.5% of the maximum value of the Ni intensity, and
wherein the total content of nickel and cobalt in the nickel-cobalt-iron diffusion layer is 9.0 g/m2 or lower.