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Copper plating bath for coating copper and method for surface copper plating permanent magnetic material using the same

A permanent magnet material, copper plating solution technology, applied in metal material coating process, liquid chemical plating, coating and other directions, can solve the problem of easy rust corrosion, magnetic performance decline or damage, reduce product stability and reliability and other problems, to achieve the effect of good bonding performance, good corrosion resistance, and reducing hydrogen embrittlement.

Active Publication Date: 2009-02-25
BEIJING ZHONG KE SAN HUAN HI TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The rare earth element neodymium in the NdFeB powder alloy is active in nature, which makes the corrosion resistance of the entire NdFeB alloy very poor. It is easy to rust and corrode in a hot and humid environment, and the magnetic properties will be reduced or damaged due to corrosion failure. , which seriously affects the service life of NdFeB permanent magnets and reduces the stability and reliability of the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Will 2.3 kilograms of high-quality NdFeB permanent magnet materials are first polished in a vibration mill for 2 hours. After degreasing and degreasing with sodium phosphate 20g / liter, sodium carbonate 10g / liter and sodium hydroxide 10g / liter, pickle in 1% nitric acid to remove surface oxides, wash 3 times with water, and then activate copper plating with 5% sulfuric acid . Put the above-mentioned pretreated NdFeB permanent magnet material into the copper plating solution, the composition of the copper plating solution is copper sulfate 0.03 mol / liter, potassium sulfite 0.10 mol / liter, EDTA 0.15 mol / liter, sodium fluoride 0.05 mol / L, pH 6.8. React in a drum for 15 minutes at a temperature of 45°C to form a copper layer on the surface of the NdFeB permanent magnet material. The thickness of the copper layer is 3.5 microns, and the cross file test shows that the copper plating layer does not peel off, does not peel off, and has a good bonding force, see Table 1.

Embodiment 2

[0034] Will 2.5 kilograms of NdFeB permanent magnet materials are polished according to the method in Example 1, degreased and degreased, and activated by pickling. Copper sulfate 0.03 mol / liter, sodium sulfite 0.15 mol / liter, ethylenediamine 0.65 mol / liter, sodium fluoride 0.05 mol / liter, pH 7.5. React in a drum for 25 minutes at a temperature of 45°C to form a copper layer on the surface of the NdFeB permanent magnet material. The thickness of the copper layer is 2.3 microns, and the cross file test shows that the copper plating layer does not peel off, does not peel off, and has a good bonding force, see Table 1.

Embodiment 3

[0036] Will 2.5 kilograms of NdFeB permanent magnet materials are polished according to the method in Example 1, degreased and degreased, and activated by pickling. Copper sulfate 0.03 mol / liter, potassium sulfite 0.10 mol / liter, sodium citrate 0.15 mol / liter, sodium fluoride 0.15 mol / liter, pH 6.9. React at a temperature of 55°C for 15 minutes in a drum to form a copper layer on the surface of the NdFeB permanent magnet material. The thickness of the copper layer is 3.3 microns, and the cross file test shows that the copper plating layer does not peel off, does not peel off, and has a good bonding force, see Table 1.

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PUM

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Abstract

The invention relates to copper plating solution for copper coating, which comprises the following compositions: 0.03 to 0.5 mol / l of copper sulphate, 0.10 to 0.3 mol / l of sulphate and 0.1 to 0.7 mol / l of a complexing agent, and the PH value is regulated to 6.5 to 8.0. In the invention, surface copper coating is carried out on a permanent-magnet material which is pre-treated by the copper plating solution so as to obtain a copper coating with evenness, stability and strong bonding force of the copper coating, and the surface of the permanent-magnet material has excellent corrosion resistance.

Description

technical field [0001] The invention relates to the field of surface chemical treatment of materials, in particular to the surface copper plating technology of NdFeB permanent magnet materials. Copper plating method on the surface of permanent magnet materials. Background technique [0002] In recent years, the application and development of neodymium iron boron (NdFeB) permanent magnet materials is very rapid, and the success of the protection of NdFeB permanent magnet materials is related to one of the key technologies whether the material can be popularized and applied. The material is mainly made of rare earth metals such as neodymium Nd, iron and boron through powder metallurgy process. As the strongest magnetic material at present, it has been widely used in electroplating devices, machinery, medical treatment, automobiles and other fields, and its application prospects are very broad. [0003] The premise of the application of NdFeB permanent magnet materials is to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/44C23C18/18
Inventor 白晓刚潘广麾
Owner BEIJING ZHONG KE SAN HUAN HI TECH
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