Ni-plated steel sheet and method for manufacturing Ni-plated steel sheet

Patent metadata

Field	Value
Publication number	US-11618965-B2
Application number	US-201917296395-A
Country	US
Kind code	B2
Filing date	Dec 20, 2019
Priority date	Dec 27, 2018
Publication date	Apr 4, 2023
Grant date	Apr 4, 2023

Abstract

A Ni-plated steel sheet according to an aspect of the present invention includes: a base steel sheet; an Fe—Ni diffusion alloy region disposed on the base steel sheet; and a Ni plating region disposed on the Fe—Ni diffusion alloy region, in which an average equivalent circle diameter of crystal grains made of Ni (fcc) in the Ni plating region measured in a cross section perpendicular to a rolled surface of the base steel sheet is 0.2 to 4.0 μm.

First claim

The invention claimed is:

1. A Ni-plated steel sheet, comprising:
a base steel sheet;
an Fe—Ni diffusion alloy region disposed on the base steel sheet; and
a Ni plating region disposed on the Fe—Ni diffusion alloy region,
wherein an average equivalent circle diameter of crystal grains made of face-centered cubic (fcc) Ni in the Ni plating region measured in a cross section perpendicular to a rolled surface of the base steel sheet is 0.2 to 4.0 μm.

2. The Ni-plated steel sheet according to claim 1 ,
wherein a value obtained by dividing the average equivalent circle diameter of the crystal grains made of the Ni (fcc) in the Ni plating region by a thickness of the Ni plating region is 0.50 to 2.00.

3. The Ni-plated steel sheet according to claim 1 ,
wherein a total amount of Ni contained in the Fe—Ni diffusion alloy region and the Ni plating region, per unit area, is 1.5 to 65 g/m 2 .

4. A method for manufacturing the Ni-plated steel sheet according to claim 1 , the method comprising:
electrolytic Ni plating on a base steel sheet to obtain a Ni-plated steel sheet material; and
annealing the Ni-plated steel sheet material,
wherein the electrolytic Ni plating includes three or more on-times and off-times between the on-times,
an average current density per one surface of the base steel sheet in each of the on-times is set to 200 A/m 2 to 3,500 A/m 2 ,
an amount of charge per one surface of the base steel sheet in each of the on-times is set to 800 C/m 2 to 40,000 C/m 2 ,
in each of the on-times, a current density is set to be inconstant, and a maximum current density per one surface of the base steel sheet is set to be higher than the average current density per one surface of the base steel sheet by 7% or more and is set to 4,000 A/m 2 or less,
a soaking temperature in the annealing is set to 650° C. or higher and 850° C. or lower, and
a soaking time in the annealing is set to 10 seconds or longer and 109 seconds or shorter.

5. The method for manufacturing the Ni-plated steel sheet according to claim 4 ,
wherein a length of each of the off-times is 0.1 seconds or longer.

6. The Ni-plated steel sheet according to claim 2 ,
wherein a total amount of Ni contained in the Fe-Ni diffusion alloy region and the Ni plating region, per unit area, is 1.5 to 65 g/m 2 .

7. A method for manufacturing the Ni-plated steel sheet according to claim 2 , the method comprising:
electrolytic Ni plating on a base steel sheet to obtain a Ni-plated steel sheet material; and
annealing the Ni-plated steel sheet material,
wherein the electrolytic Ni plating includes three or more on-times and off-times between the on-times,
an average current density per one surface of the base steel sheet in each of the on-times is set to 200 A/m 2 to 3,500 A/m 2 ,
an amount of charge per one surface of the base steel sheet in each of the on-times is set to 800 C/m 2 to 40,000 C/m 2 ,
in each of the on-times, a current density is set to be inconstant, and a maximum current density per one surface of the base steel sheet is set to be higher than the average current density per one surface of the base steel sheet by 7% or more and is set to 4,000 A/m 2 or less,
a soaking temperature in the annealing is set to 650° C. or higher and 850° C. or lower, and
a soaking time in the annealing is set to 10 seconds or longer and 109 seconds or shorter.

8. A method for manufacturing the Ni-plated steel sheet according to claim 3 , the method comprising:
electrolytic Ni plating on a base steel sheet to obtain a Ni-plated steel sheet material; and
annealing the Ni-plated steel sheet material,
wherein the electrolytic Ni plating includes three or more on-times and off-times between the on-times,
an average current density per one surface of the base steel sheet in each of the on-times is set to 200 A/m 2 to 3,500 A/m 2 ,
an amount of charge per one surface of the base steel sheet in each of the on-times is set to 800 C/m 2 to 40,000 C/m 2 ,
in each of the on-times, a current density is set to be inconstant, and a maximum current density per one surface of the base steel sheet is set to be higher than the average current density per one surface of the base steel sheet by 7% or more and is set to 4,000 A/m 2 or less,
a soaking temperature in the annealing is set to 650° C. or higher and 850° C. or lower, and
a soaking time in the annealing is set to 10 seconds or longer and 109 seconds or shorter.

9. A method for manufacturing the Ni-plated steel sheet according to claim 6 , the method comprising:
electrolytic Ni plating on a base steel sheet to obtain a Ni-plated steel sheet material; and
annealing the Ni-plated steel sheet material,
wherein the electrolytic Ni plating includes three or more on-times and off-times between the on-times,
an average current density per one surface of the base steel sheet in each of the on-times is set to 200 A/m 2 to 3,500 A/m 2 , an amount of charge per one surface of the base steel sheet in each of the on-times is set to 800 C/m 2 to 40,000 C/m 2 ,
in each of the on-times, a current density is set to be inconstant, and a maximum current density per one surface of the base steel sheet is set to be higher than the average current density per one surface of the base steel sheet by 7% or more and is set to 4,000 A/m 2 or less,
a soaking temperature in the annealing is set to 650° C. or higher and 850° C. or lower, and
a soaking time in the annealing is set to 10 seconds or longer and 109 seconds or shorter.

10. The method for manufacturing the Ni-plated steel sheet according to claim 7 ,
wherein a length of each of the off-times is 0.1 seconds or longer.

11. The method for manufacturing the Ni-plated steel sheet according to claim 8 ,
wherein a length of each of the off-times is 0.1 seconds or longer.

12. The method for manufacturing the Ni-plated steel sheet according to claim 9 ,
wherein a length of each of the off-times is 0.1 seconds or longer.

Assignees

• Nippon Steel Corp

Inventors

• Goto Yasuto
• Ishizuka Kiyokazu
• Takahashi Takehiro

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• C25D5/18

  Electroplating using modulated, pulsed or reversing current · CPC title

• C21D9/46

  for sheet metals · CPC title

• C25D5/617 Primary

  Crystalline layers · CPC title

• C25D5/50 Primary

  by heat-treatment · CPC title