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Method for electroplating nickel, copper and nickel for sintered NdFeB magnets

A neodymium iron boron and nickel electroplating technology, applied in the field of sintered neodymium iron boron electroplating, can solve problems such as reducing the bonding force between the coating and the neodymium iron boron magnet, and achieve the effects of reducing secondary corrosion, reducing bonding force and ensuring cleanliness

Active Publication Date: 2020-10-16
天津京磁电子元件制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Electroplated nickel-copper-nickel NdFeB permanent magnet products are generally nickel-plated in acidic nickel-plating solution, but if the nickel-plating time is long, the hydrogen ions and chloride ions in the nickel-plating solution will cause certain corrosion to the NdFeB magnet. And reduce the bonding force between the coating and the NdFeB magnet

Method used

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  • Method for electroplating nickel, copper and nickel for sintered NdFeB magnets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The method for nickel-copper-nickel electroplating of sintered NdFeB magnets includes bottom nickel plating, copper plating, and surface nickel plating. The bottom nickel plating includes the following steps:

[0032] S1. Use an initial impulse current of 43A to treat the sintered NdFeB magnet for 6 minutes in the nickel sulfate solution, and then reduce the current to 30A for 60 minutes. Among them, the nickel sulfate solution is: 345g / L nickel sulfate, 45g / L chloride Aqueous solution of nickel, 55g / L boric acid, 2ml / L additive, pH 4.

[0033] The temperature for treating sintered NdFeB magnets in nickel sulfate solution is 45°C.

[0034] The bottom nickel plating treatment also includes: S2, sintered NdFeB magnets are treated in a nickel sulfate solution and then activated. The activation treatment specifically includes immersing the sintered NdFeB magnets in a sulfuric acid solution with a concentration of 2mL / L for 10s.

[0035] Copper plating process includes the ...

Embodiment 2

[0047] The method for nickel-copper-nickel electroplating of sintered NdFeB magnets includes bottom nickel plating, copper plating, and surface nickel plating. The bottom nickel plating includes the following steps:

[0048] S1. Use an initial impulse current of 47A to treat the sintered NdFeB magnet for 8 minutes in the nickel sulfate solution, and then reduce the current to 35A for 70 minutes. Among them, the nickel sulfate solution is: 365g / L nickel sulfate, 50g / L chloride The aqueous solution of nickel, 50g / L boric acid, 3ml / L additive, pH is 4.5.

[0049] The temperature for treating sintered NdFeB magnets in nickel sulfate solution is 50°C.

[0050] The bottom nickel plating treatment also includes: S2, sintered NdFeB magnets are treated in a nickel sulfate solution and then activated. The activation treatment specifically includes immersing the sintered NdFeB magnets in a sulfuric acid solution with a concentration of 2.5mL / L for 15s.

[0051] Copper plating process in...

Embodiment 3

[0063] The method for nickel-copper-nickel electroplating of sintered NdFeB magnets includes bottom nickel plating, copper plating, and surface nickel plating. The bottom nickel plating includes the following steps:

[0064] S1. Use an initial impulse current of 51A to treat the sintered NdFeB magnet for 10 minutes in the nickel sulfate solution, and then reduce the current to 40A for 80 minutes. The nickel sulfate solution is: 380g / L nickel sulfate, 55g / L chloride Aqueous solution of nickel, 65g / L boric acid, 4ml / L additive, pH 5.

[0065] The temperature for treating sintered NdFeB magnets in nickel sulfate solution is 55°C.

[0066] The bottom nickel plating treatment also includes: S2, sintered NdFeB magnets are treated in a nickel sulfate solution and then activated. The activation treatment specifically includes immersing the sintered NdFeB magnets in a sulfuric acid solution with a concentration of 3mL / L for 20s.

[0067] Copper plating process includes the following s...

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Abstract

The invention discloses a method for electronickeling copper nickel on a sintered neodymium iron boron magnet. The method comprises steps of bottom layer nickling treatment, copper plating treatment and surface layer nickling treatment, wherein the bottom layer nickling treatment is prepared by adopting the following steps: S1, treating the sintered neodymium iron boron magnet for 6-10 minutes with primary impact current of 43-51A in a nickel sulfate solution, reducing the current to 30-40A, and treating for 60-80 minutes, wherein the nickel sulfate solution comprises 345-380g / L nickel sulfate, 45-55g / L nickel chloride, 55-65g / L boric acid and 4ml / L of an additive solution, the pH value is 4-5, and the temperature of the sintered neodymium iron boron magnet treated in the nickel sulfate solution is 45-55 DEG C. By adopting the method, the time for plating a bottom nickel layer can be remarkably shortened, corrosion of the nickel sulfate solution to the sintered neodymium iron boron magnet can be reduced, and the binding force of the bottom nickel layer with the sintered neodymium iron boron magnet can be improved.

Description

technical field [0001] The invention relates to the technical field of sintered NdFeB electroplating. More specifically, the present invention relates to a method for electroplating nickel-copper-nickel on sintered NdFeB magnets. Background technique [0002] With the development of rare earth NdFeB permanent magnet materials, problems in NdFeB electroplating have become increasingly apparent, which has become an important factor restricting its development. NdFeB permanent magnet materials are powder metallurgy materials, and are composed of multi-phases with large potential differences, especially the neodymium-rich phase has a low potential and is prone to intergranular corrosion. Therefore, in order to improve the corrosion resistance of sintered NdFeB magnets, the electroplating methods of electro-galvanizing and electro-nickel-copper-nickel are usually used. With the popularization of automatic assembly of terminal products and long-life design of products, the requi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D3/12C25D3/38C25D5/14C25D5/18C25D5/34C25D7/00
CPCC25D3/12C25D3/38C25D5/14C25D5/18C25D5/34C25D7/001
Inventor 韩继虎高政
Owner 天津京磁电子元件制造有限公司