Nickel-plated, heat-treated steel sheet for battery cans
AssigneeToyo Kohan Co., Ltd.
InventorsKota Sadaki, Koh Yoshioka
Life of this patent
Estimating the term…
Abstract
A nickel-plated heat-treated steel sheet for a battery can, having a nickel layer with a nickel amount of 4.4 to 26.7 g/m2 on a steel sheet. When the Fe intensity and the Ni intensity are continuously measured along the depth direction from the surface of the nickel-plated heat-treated steel sheet for a battery can, by using a high frequency glow discharge optical emission spectrometric analyzer, the difference between the depth at which the Fe intensity exhibits a first predetermined value and the depth at which the Ni intensity exhibits a second predetermined value is less than 0.04 μm.
Claims6
A nickel plated heat treated steel sheet for a battery can, comprising:
- a bottomed cylindrical shaped article made of a surface-treated steel sheet, wherein the surface-treated steel sheet comprises:
- a nickel layer constituting an outermost layer with a nickel amount of 4.4 to 26.7 g/m2 deposed on an inner surface of the bottomed cylindrical shaped article,
- wherein when a Fe intensity and a Ni intensity are continuously measured along depth direction from the inner surface of the bottomed cylindrical shaped article, by using a high frequency glow discharge optical emission spectrometric analyzer, a difference (D2−D1) between a depth (D1) at which the Fe intensity exhibits a first predetermined value and a depth (D2) at which the Ni intensity exhibits a second predetermined value is less than 0.04 μm,
- wherein the depth (D1) exhibiting the first predetermined value is a depth exhibiting an intensity of 10% of a saturated value of the Fe intensity measured by the above-described measurement, and
- the depth (D2) exhibiting the second predetermined value is a depth exhibiting an intensity of 10% of a maximum value when the measurement is further performed along the depth direction after the Ni intensity shows the maximum value by the above-described measurement.
A method for producing a battery can having a nickel-plated heat-treated steel sheet, the method comprising:
- forming a bottomed cylindrical shaped article having an inner surface, and
- forming the nickel-plated heat-treated steel sheet by a method comprising:
- forming a nickel plating layer on a surface of a steel sheet with a nickel amount of 4.4 to 26.7 g/m2, and
- forming an iron-nickel diffusion layer and a nickel layer constituting an outermost layer by applying a heat treatment to the steel sheet having the nickel plating layer formed thereon by maintaining the steel sheet at a temperature of 350° C. to 450° C. for 30 seconds to 2 minutes,
- wherein the nickel plating layer is formed on the inner surface of the bottomed cylindrical shaped article.
Dependencies are inferred from the claim text.