Application process of multi-layer electroplated coinage materials and products thereof

A multi-layer electroplating and coinage technology, applied in the field of coinage, can solve problems such as poor corrosion resistance of nickel-iron alloys, and achieve the effects of good process performance, poor corrosion resistance and lower coinage costs.

Active Publication Date: 2009-09-16
SHANGHAI MINT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a multi-layer electroplating coinage material application process and product in view of the deficiencies of the prior art. The process reduces the cost of coinage; the product has special electromagnetic properties, and strengthens the machine-readable anti-counterfeiting of circulating coins performance and improve its processing performance, and at the same time solve the problem of poor corrosion resistance of nickel-iron alloy as a surface coating in a humid environment

Method used

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  • Application process of multi-layer electroplated coinage materials and products thereof
  • Application process of multi-layer electroplated coinage materials and products thereof
  • Application process of multi-layer electroplated coinage materials and products thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Electroplating nickel-iron alloy layer and nickel layer on the coinage material (metal cake-shaped material) is specifically carried out according to the following steps:

[0062] (1), Electroplated nickel-iron alloy bottom layer

[0063] a. Alkaline washing

[0064] Put the metal cake-shaped material into the alkaline cleaning tank, the alkaline cleaning solution is prepared with 48g / L alkaline cleaning agent, the pH value is 12, the temperature is 65°C, and the drum speed is 7r / min for 1 minute cleaning, and then use Rinse with ionized water. Alkaline cleaning agent consists of sodium hydroxide: 41.8%, sodium carbonate: 25.0%, sodium gluconate: 2.2%, nonylphenol 1.8%, sodium silicate 9.2%, sodium triphosphate 9.2%, EDTA9.0%, twelve Sodium Alkylbenzene Sulfate 1.8% Composition.

[0065] The oil stains on the above-mentioned cake-shaped materials can be preliminarily removed by alkaline cleaning. Alkaline cleaning includes the chemical degreasing process of saponific...

Embodiment 2

[0082] Electroplate nickel-iron alloy layer, copper layer and nickel layer respectively successively on coinage material (metal cake shape material), and its specific electroplating process is carried out according to the following steps:

[0083] (1), Electroplated nickel-iron alloy bottom layer

[0084] a. Alkaline washing

[0085] Put the metal cake-shaped material into the alkaline cleaning tank, the alkaline cleaning solution is prepared with 55g / L alkaline cleaning agent, the pH value is 12, the temperature is 60°C, and the drum speed is 8r / min for 2 minutes, and then use Rinse with ionized water. Alkaline cleaning agent consists of sodium hydroxide: 43.5%, sodium carbonate: 28.0%, sodium gluconate: 3.0%, nonylphenol 2.2%, sodium silicate 10.0%, sodium triphosphate 10.0%, EDTA9.5%, twelve Sodium Alkylbenzene Sulfate 2.0% composition.

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Abstract

The invention discloses an application process of multi-layer electroplated coinage materials and products thereof. The process is characterized in that the coinage material is applied to the manufacturing of planchet cakes after the multi-layer electroplating. The multi-layer electroplating is characterized in that a Ni-Fe alloy layer and a nickel layer or a Ni-Fe alloy layer, a copper layer and a nickel layer are successfully electroplated on the coinage material. The specific process comprises alkali washing, electrochemical washing, activating treatment and Ni-Fe alloy layer, copper layer and nickel layer electroplating procedures. The application process can lower the production cost and improve the production efficiency. The prepared coinage planchet cakes have good processing performance and specific electromagnetic signals. The machine-readable anti-conterfeiting performance of circulation coins is strengthened. Simultaneously, the poor corrosion resistance problem of the Ni-Fe alloy which is used as a surface coating under the moist environment is solved.

Description

technical field [0001] The invention relates to the technical field of coinage, in particular to an application process of multilayer electroplating coinage materials and its products. Background technique [0002] Nickel-iron alloy coating has excellent magnetic, electrical and mechanical properties, fine crystallization, strong covering ability, good brightness, leveling, uniformity, ductility and corrosion resistance. Nickel-iron alloy coating is widely used as a protective decoration and wear-resistant material. It is an important functional magnetic material. The cost of electrodepositing nickel-iron alloy is low. The iron content in the coating can be adjusted, and it can be deposited on almost any conductive substrate. [0003] The earliest research on nickel-iron alloy electrodeposition was used for protection and decoration, which can save expensive nickel. In the 1940s and 1950s, the exploration and research of nickel-iron alloy plating began, but the development ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/12C25D3/12C25D3/38C25D3/56B32B15/01A44C21/00
Inventor 张勃徐伟王卓新杨磊
Owner SHANGHAI MINT
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