CN-122029313-A - Ni-plated surface-treated steel sheet and battery container

Abstract

Provided is a Ni-plated surface-treated steel sheet comprising a steel sheet and a Fe-Ni-Cu-Cr layer formed on at least one surface of the steel sheet, wherein when Cu strength is continuously measured from the surface side of the Fe-Ni-Cu-Cr layer toward the depth direction by high-frequency glow discharge emission spectroscopy (GDS), the ratio IR Cu‑0.1d of Cu strength In Cu‑0.1d at a position 0.1 [ mu ] m from the surface side to Cu strength In Cu‑steel of the steel sheet is 0.5 or more and less than 3.0.

Inventors

• Xiaofan Junji
• Ji Gangxing
• Uehara kayo
• Song Zhongdafu

Assignees

• 东洋钢钣株式会社

Dates

Publication Date

20260512

Application Date

20241021

Priority Date

20231020

Claims (10)

1. 1. A Ni-plated surface-treated steel sheet comprising a steel sheet formed of carbon steel and a Fe-Ni-Cu-Cr layer formed on at least one surface of the steel sheet, When Cu strength is continuously measured from the surface side of the Fe-Ni-Cu-Cr layer toward the depth direction by high-frequency glow discharge emission spectroscopy (GDS), the ratio IR Cu-0.1d of Cu strength In Cu-0.1d at a position 0.1 μm deep from the surface side to Cu strength In Cu-steel of the steel sheet is 0.5 or more and less than 3.0.
2. 2. The Ni-plated surface-treated steel sheet according to claim 1, wherein a ratio IR Cu-0.5d of Cu strength In Cu-0.5d at a position 0.5 μm deep from a surface side to Cu strength In Cu-steel of the steel sheet is 0.5 or more and less than 3.0 when Cu strength is continuously measured from the surface side of the Fe-Ni-Cu-Cr layer toward a depth direction by high-frequency glow discharge emission spectroscopy (GDS).
3. 3. The Ni-plated surface-treated steel sheet according to claim 1 or 2, wherein a ratio IR Cr-0.5d of Cr strength In Cr-0.5d at a position 0.5 μm deep from a surface side to Cr strength In Cr-steel of the steel sheet is 0.2 or more and less than 2.0 when Cr strength is continuously measured from the surface side of the Fe-Ni-Cu-Cr layer toward a depth direction by high frequency glow discharge emission spectroscopy (GDS).
4. 4. The Ni-plated surface-treated steel sheet according to any one of claims 1 to 3, wherein a ratio IR Cr-0.1d of Cr strength In Cr-0.1d at a position 0.1 μm deep from a surface side of the Fe-Ni-Cu-Cr layer to Cr strength In Cr-steel of the steel sheet is 0.2 or more and less than 2.0 when Cr strength is continuously measured from the surface side toward a depth direction by high-frequency glow discharge emission spectroscopy (GDS).
5. 5. The Ni-plated surface-treated steel sheet according to any one of claims 1 to 4, wherein a ratio IR Cu-0.3d~0.7d of Cu strength In Cu-0.3d~0.7d at a depth of 0.3 to 0.7 μm from a surface side to Cu strength In Cu-steel of the steel sheet is 0.5 or more and 3.0 or less when Cu strength is continuously measured from the surface side of the Fe-Ni-Cu-Cr layer toward a depth direction by high-frequency glow discharge emission spectroscopy (GDS).
6. 6. The Ni-plated surface-treated steel sheet according to any one of claims 1 to 5, wherein the Fe-Ni-Cu-Cr layer has an enriched region of Cu.
7. 7. The Ni-plated surface-treated steel sheet according to any one of claims 1 to 6, wherein when Cu strength is continuously measured from the surface side of the Fe-Ni-Cu-Cr layer toward the depth direction by high-frequency glow discharge emission spectroscopy (GDS), a ratio IR Cu-MAX of a maximum Cu strength In MAX to a Cu strength In Cu-steel of the steel sheet In a depth up to the steel sheet exceeds 0.8 and is 3.0 or less.
8. 8. The Ni-plated surface-treated steel sheet according to any one of claims 1 to 7, wherein the steel sheet is a low carbon steel or an extremely low carbon steel.
9. 9. The Ni-plated surface-treated steel sheet according to any one of claims 1 to 8, wherein, The steel plate is made of low-carbon steel, The Cu content of the steel plate is 0.01-1.0 wt%, The Cr content of the steel plate is 0.01-1.0 wt%.
10. 10. A battery container obtained by using the Ni-plated surface-treated steel sheet according to any one of claims 1 to 9.

Description

Ni-plated surface-treated steel sheet and battery container Technical Field The present invention relates to a Ni-plated surface-treated steel sheet and a battery container. Background Conventionally, ni-plated steel sheets containing Ni have been widely used as a material for battery containers. Patent document 1 discloses a Ni-plated steel sheet for a battery container, which has an fe—ni diffusion layer formed by forming a nickel plating layer on the steel sheet and then performing a heat diffusion treatment, and which controls the ratio of Ni to Fe in the outermost layer so as to prevent occurrence of pitting and weeping. Prior art literature Patent literature Patent document 1 Japanese patent application laid-open No. 2014-47359 Disclosure of Invention Problems to be solved by the invention However, with the increase in capacity of the battery, in the battery container using the Ni-plated steel sheet disclosed in patent document 1, there is a problem that when overdischarge occurs due to an abnormality of the battery management system, the potential of the fe—ni diffusion layer approaches the positive electrode potential, and iron may be eluted from the fe—ni diffusion layer into the electrolyte solution, resulting in corrosion of the inner wall of the battery container. In the future, with the increase in capacity of batteries, it is expected that the positive electrode potential will further increase, and Ni-plated steel sheets having further excellent electrolyte resistance at the time of overdischarge are demanded. The purpose of the present invention is to provide a Ni-plated surface-treated steel sheet that has excellent electrolyte resistance during overdischarge. Solution for solving the problem The present inventors have conducted intensive studies to achieve the above object and as a result, have found that the above object can be achieved by forming an fe—ni—cu—cr layer on a Ni-plated surface-treated steel sheet, and have completed the present invention. [1] According to aspect 1 of the present invention, there is provided a Ni-plated surface-treated steel sheet comprising: when Cu strength is measured continuously from the surface side of the Fe-Ni-Cu-Cr layer toward the depth direction by high-frequency glow discharge emission spectroscopy (GDS), a ratio IR Cu-0.1d of Cu strength In Cu-0.1d at a position 0.1 μm deep from the surface side to Cu strength In Cu-steel of the steel sheet is 0.5 or more and less than 3.0. [2] According to claim 2 of the present invention, there is provided the Ni-plated surface-treated steel sheet of claim 1, wherein a ratio IR Cu-0.5d of Cu strength In Cu-0.5d at a position 0.5 μm from a surface side to Cu strength In Cu-steel of the steel sheet is 0.5 or more and less than 3.0 when Cu strength is continuously measured from the surface side of the Fe-Ni-Cu-Cr layer toward a depth direction by high-frequency glow discharge emission spectroscopy (GDS). [3] According to claim 3 of the present invention, there is provided the Ni-plated surface-treated steel sheet of claim 1 or 2, wherein a ratio IR Cr-0.5d of Cr strength In Cr-0.5d at a position 0.5 μm deep from a surface side of the Fe-Ni-Cu-Cr layer to Cr strength In Cr-steel of the steel sheet is 0.2 or more and less than 2.0 when Cr strength is continuously measured from the surface side toward a depth direction by high-frequency glow discharge emission spectroscopy (GDS). [4] According to claim 4 of the present invention, there is provided the Ni-plated surface-treated steel sheet according to any one of claims 1 to 3, wherein when Cr strength is continuously measured from the surface side of the Fe-Ni-Cu-Cr layer toward the depth direction by high-frequency glow discharge emission spectroscopy (GDS), a ratio IR Cr-0.1d of Cr strength In Cr-0.1d at a position 0.1 μm from the surface side to Cr strength In Cr-steel of the steel sheet is 0.2 or more and less than 2.0. [5] According to claim 5 of the present invention, there is provided the Ni-plated surface-treated steel sheet according to any one of claims 1 to 4, wherein a ratio IR Cu-0.3d~0.7d of Cu strength In Cu-0.3d~0.7d at a depth of 0.3 to 0.7 μm from a surface side to Cu strength In Cu-steel of the steel sheet is 0.5 or more and 3.0 or less when Cu strength is continuously measured from the surface side of the Fe-Ni-Cu-Cr layer toward a depth direction by high-frequency glow discharge emission spectroscopy (GDS). [6] According to claim 6 of the present invention, there is provided the Ni-plated surface-treated steel sheet according to any one of claims 1 to 5, wherein the fe—ni—cu—cr layer has a Cu enriched region. [7] According to claim 7 of the present invention, there is provided the Ni-plated surface-treated steel sheet according to any one of claims 1 to 6, wherein when Cu strength is continuously measured from the surface side of the Fe-Ni-Cu-Cr layer toward the depth direction by high-frequency glow discharge emission spectroscopy (GDS), a ratio