Mercury-free button cell cathode cap material and preparation method thereof

A button battery and negative electrode cover technology is applied to the negative electrode cover material of mercury-free alkaline zinc-manganese button battery and its preparation, and the field of mercury-free button battery negative electrode cover material and its preparation field, which can solve the problems of coating peeling, sticking and grinding tools, etc.

Active Publication Date: 2014-06-18
HUNAN YONGSHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a mercury-free button battery negative cover with good stamping performance and anti-flat performance in order to solve the problems of coating shedding and sticking abrasives in the process of preparing the negative cover by the existing pre-plating method. Materials and their preparation methods

Method used

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  • Mercury-free button cell cathode cap material and preparation method thereof
  • Mercury-free button cell cathode cap material and preparation method thereof
  • Mercury-free button cell cathode cap material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] The specific preparation process of the above-mentioned steel strip: select the SPCC cold-rolled low-carbon steel strip with a thickness of 0.25 mm produced by Shanghai Baosteel as the electroplating substrate. Its chemical composition is (% represents weight percentage):

[0067]

[0068] 1. Treat the low carbon steel strip before plating

[0069] In order to have a good bond between the coating and the substrate, the cathode substrate must be carefully pretreated before electroplating. Since the surface of the low-carbon steel strip used is relatively flat, there is no need for grinding and mechanical polishing before nickel plating, and degreasing and activation treatment are directly carried out. The method of chemical high-temperature degreasing and electrolytic degreasing is adopted. After the degreasing is complete, the surface of the sample is rinsed with distilled water, and then placed in an activator for activation. After taking out the sample and washin...

Embodiment 2

[0148] Preparation method: select the same substrate as in Example 1, adopt the same pre-plating treatment as in Example 1, and electroplate nickel coating, copper coating, first zinc coating, tin coating, indium coating and second zinc coating respectively according to the method of Example 1 Plating, wherein the thickness of the nickel coating is 0.3 μm, the thickness of the copper coating is 1.5 μm, the thickness of the first zinc coating is 0.5 μm, the thickness of the tin coating is 3 μm, the thickness of the indium coating is 0.1 μm, and the thickness of the second zinc coating is 1.5 μm, and then Same heat treatment and mechanical rolling as in Example 1.

Embodiment 3

[0156] Preparation method: select the same substrate as in Example 1, adopt the same pre-plating treatment as in Example 1, and electroplate nickel coating, copper coating, first zinc coating, tin coating, indium coating and second zinc coating respectively according to the method of Example 1 The coatings, wherein the thickness of the nickel coating is 1.0 μm, the thickness of the copper coating is 2.5 μm, the thickness of the first zinc coating is 2 μm, and the thickness of the tin coating is 5 μm.

[0157] The composition of the plating solution for electroplating indium on the surface of the tin layer is:

[0158]

[0159] DC electrodeposition process parameters:

[0160]

[0161] Under the above conditions, an indium coating with a thickness of 0.30 μm was prepared on the tin coating.

[0162] Using the method of Example 1, a second zinc coating was electroplated on the surface of the indium coating. The thickness of the second zinc layer was 2.5 μm, and then the s...

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Abstract

The invention discloses a mercury-free button cell cathode cap material and a preparation method thereof, and belongs to the field of a mercury-free alkaline zinc-manganese button cell. The preparation method comprises the following steps: by taking a steel strip as a base, arranging a nickel coating on one side of the base as the external surface of a cell cathode cap, and orderly electrically depositing the nickel coating, a copper coating, a first zinc coating, a tin coating, an indium coating and a second zinc coating on the other side of the base; and thermal treating all the metal coatings to improve the toughness of the outermost zinc coating, wherein the tin coating and the indium coating are protected by the arrangement of the inner and outer zinc coatings, and a tin diffusion layer, an indium diffusion layer and a zinc diffusion layer are formed, thus the hydrogen evolution over-potential is increased; and by mechanical rolling, the stamping resistance of a product is effectively improved. Compared with a conventional process for directly preparing an alloy, the cathode cap material prepared by the method disclosed by the invention is simpler and easier to operate, effectively prevents the problems that the tin coating falls off and is adhered with a grinding tool during the preparation of a cathode cap by use of an original pre-coating method, simultaneously realizes an aim of environmental protection by replacing mercury with indium, has good stamping performance and air expansion resistance, can completely realize no use of mercury of the alkaline zinc-manganese button cell and is applicable to industrial production.

Description

technical field [0001] The invention discloses a mercury-free button battery negative electrode cover material and a preparation method thereof, in particular to a steel strip surface electrodeposited nickel, copper, tin, indium and zinc multi-metal coating structure after heat treatment and mechanical rolling. A mercury-free alkaline zinc-manganese button battery negative cover material and a preparation method thereof. The invention belongs to the technical field of mercury-free alkaline zinc-manganese button cell manufacturing. Background technique [0002] At present, the traditional alkaline zinc-manganese batteries used in the domestic market generally contain mercury in the negative electrode zinc paste for the purpose of suppressing flatulence. However, mercury has great harm to the environment and human body. A mercury-containing button battery can make 1 square meter of land lose its use value forever, and can pollute 600m3 of water resources. [0003] Therefore,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/12C25D5/36C25D5/48
Inventor 刘小铷曹丰文黄杰军朱岭尹业文田槟铖
Owner HUNAN YONGSHENG NEW MATERIALS
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