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Method for pulse plating of copper using pyrophosphate with neodymium-iron-boron permanent magnet

A pyrophosphate and pulse electroplating technology, applied in the field of electroplating copper, can solve the problems of pollution and difficult to solve, and achieve the effects of low pollution, good coating and high efficiency

Inactive Publication Date: 2005-01-19
TIANJIN CIQIANG TECH DEV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The metal copper layer is obtained by electroplating. The usual copper plating method is cyanide copper plating. Cyanide copper plating is a commonly used process, because cyanide is a highly toxic material, and the pollution of this process is difficult to solve.

Method used

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Embodiment Construction

[0029] The present invention will be further described in detail below in conjunction with specific embodiments: In order to ensure the stability of the NdFeB magnet, we use different metal combination coatings to protect the magnets. Electroplated copper is a better intermediate coating, and it has the following characteristics:

[0030] 1. Low cost: Since the price of metal copper is much lower than that of metal nickel, as an intermediate coating, the cost can be effectively reduced on the premise of ensuring the protection ability.

[0031] 2. Non-magnetic: Metal copper is a non-magnetic material, while metallic nickel is a magnetic material. In the case of the same coating thickness, the electroplated nickel coating will shield the external magnetic force of the NdFeB magnet due to magnetic conductivity. Electroplated copper does not produce shielding.

[0032] 3. Good electrical conductivity: Since the electrical conductivity of metal copper is far better than that of me...

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Abstract

The invention discloses a method for pulse plating of copper using pyrophosphate with neodymium-iron-boron permanent magnet, wherein the formula for the electroplate copper process and galvanizing solution includes, copper sulphate, normal potassium pyrophosphate, ammonial solution, polishing agent, wetting agent, and copper ions.

Description

technical field [0001] The invention relates to the field of copper electroplating methods. Background technique [0002] Sintered NdFeB permanent magnets are powder metallurgy materials, and the main components are rare earth elements. NdFeB permanent magnets can be made into various shapes such as cylinders, discs, and rings according to needs. Due to its high magnetic energy product and good use effect, it can be made into various electronic components and widely used in electrical and electrical products, such as mobile phones for communication products. [0003] The matrix of sintered NdFeB permanent magnet has high activity. The matrix of permanent magnet is easily corroded, and even loses its magnetism due to rapid corrosion. In order to make the permanent magnet work stably for a long time, it is necessary to carry out reliable corrosion protection for the permanent magnet protection. The existing anti-corrosion protection method is to electroplate one or two anti-...

Claims

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Application Information

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IPC IPC(8): C25D3/38C25D5/18
Inventor 刘伟
Owner TIANJIN CIQIANG TECH DEV
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