Surface-treated steel sheet for battery containers, battery container, and battery

Patent metadata

Field	Value
Publication number	US-9911948-B2
Application number	US-201514627902-A
Country	US
Kind code	B2
Filing date	Feb 20, 2015
Priority date	Aug 29, 2012
Publication date	Mar 6, 2018
Grant date	Mar 6, 2018

Abstract

There is provided a surface-treated steel sheet for battery containers. The surface-treated sheet is used to form a battery container for a battery. The battery uses a nonaqueous electrolytic solution as an electrolytic solution. The surface-treated steel sheet is characterized by the features as below. The surface-treated steel sheet includes a base material made of steel and an iron-nickel diffusion layer formed by performing thermal diffusion treatment after forming a nickel plating layer at least on a surface of the base material to be located at the inner surface side of the battery container. The iron-nickel diffusion layer has an outermost layer of which a ratio of Ni and Fe is 7.5 or less as a molar ratio of Ni/Fe. The iron-nickel diffusion layer has a thickness of 0.6 μm or more.

First claim

What is claimed is:

1. A method of manufacturing a surface-treated steel sheet for battery containers, the surface-treated steel sheet being used to form a battery container for a battery, the battery using a nonaqueous electrolytic solution as an electrolytic solution, comprising:
forming a nickel plating layer at least on a surface of a base material made of steel to be located at an inner surface side of the battery container; and
forming a iron-nickel diffusion layer by performing thermal diffusion treatment after forming the nickel plating layer, wherein
by performing thermal diffusion treatment, the iron-nickel diffusion layer having an outermost layer of which a ratio of Ni and Fe is 6.5 or less as a molar ratio of Ni/Fe obtained by measurement using a scanning-type Auger electron spectroscopic analyzer, and the iron-nickel diffusion layer has a thickness of 0.6 μm or more, is formed on the base material.

2. The method of manufacturing the surface-treated steel sheet according to claim 1 , wherein the iron-nickel diffusion layer of which the ratio of Ni/Fe is within a range of 6.13 to 7.33 is formed.

3. The method of manufacturing the surface-treated steel sheet according to claim 1 , wherein the iron-nickel diffusion layer of which the ratio of Ni/Fe is within a range of 0.19 to 0.36 is formed.

4. The method of manufacturing the surface-treated steel sheet according to claim 1 , wherein the nickel plating layer having a thickness of 1.0 μm or less is formed.

5. The method of manufacturing the surface-treated steel sheet according to claim 1 , wherein the nickel plating layer having a thickness of 0.5 μm or less is formed.

6. The method of manufacturing the surface-treated steel sheet according to claim 1 , wherein the iron-nickel diffusion layer has a thickness of 1.3 μm or less.

Assignees

• Toyo Kohan Co Ltd
• Toyo Kohan Co Ltd

Inventors

• Horie Shinichirou
• Tomomori Tatsuo
• Yoshioka Koh

Classifications

• Y10T428/12438

  Composite · CPC title

• H01M10/05

  Accumulators with non-aqueous electrolyte (H01M10/39 takes precedence) · CPC title

• C23C10/28

  using solids, e.g. powders, pastes · CPC title

• C23F17/00

  Multi-step processes for surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by subclass C21D or C22F or class C25 (coating for obtaining at least two superposed coatings either by methods not provided for in a single one of main groups C23C2/00 - C23C26/00, or by combinations of methods providedfor in subclasses C23C and C25D, C23C28/00) · CPC title

• C25D5/50 Primary

  by heat-treatment · CPC title