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Nickel copper phosphorus plating bath for permanent magnet material and permanent magnet material surface treatment method thereof

A surface treatment, permanent magnet material technology, applied in metal material coating process, liquid chemical plating, coating and other directions to achieve the effect of reducing hydrogen embrittlement

Inactive Publication Date: 2010-06-09
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

However, with the expansion of its application, some properties of binary Ni-P alloys need to be further improved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Will twenty four* 2.3 kg of 15*18mm sintered NdFeB permanent magnet material is 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 chemical plating solution, the composition of the plating solution is NiSO 4 ·6H 2 O 15g / L, NaH 2 PO 2 ·H 2 O 15g / L, CuSO 4 ·5H 2 O0.5g / L, sodium citrate 30g / L, pH is 6.8. React in a drum for 55 minutes at a temperature of 60°C to form a chemical layer on the surface of the NdFeB permanent magnet material. The thickness of the coating layer is 10 microns, and the grain size of the coating layer is 5.8 nanometers. See Table 1 for salt spray time.

Embodiment 2

[0030] Will twenty four* 2.5 kg of sintered NdFeB permanent magnet material of 15*18 mm is polished according to the method of Example 1, degreased and degreased, and activated by pickling. Put the above-mentioned pretreated NdFeB permanent magnet material into the chemical plating solution, the composition of the plating solution is NiSO 4 ·6H 2 O 28g / L, NaH 2 PO 2 ·H 2 O 30g / L, CuSO 4 ·5H 2 O 10g / L, potassium sodium tartrate 35g / L, ethylenediamine 10g / L, ammonia water 15ml / L. The pH is 6.8. React in a drum for 40 minutes at a temperature of 80°C to form a chemical layer on the surface of the NdFeB permanent magnet material. The thickness of the coating layer is 15 microns, and the grain size of the coating layer is 6.8 nanometers. See Table 1 for salt spray time.

Embodiment 3

[0032] Will twenty four* 2.5 kg of sintered NdFeB permanent magnet material of 15*18 mm is polished according to the method of Example 1, degreased and degreased, and activated by pickling. Put the above-mentioned pretreated NdFeB permanent magnet material into the chemical plating solution, the composition of the plating solution is NiSO 4 ·6H 2 O 20g / L, NaH 2 PO 2 ·H 2 O 23g / L, CuSO 4 ·5H 2 O 1.5g / L, potassium sodium tartrate 20g / L, ammonium acetate 25g / L, pH 6.5. React in a drum for 120 minutes at a temperature of 60°C to form a chemical layer on the surface of the NdFeB permanent magnet material. The thickness of the coating layer is 12 microns, and the grain size of the coating layer is 3.8 nanometers. See Table 1 for salt spray time.

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Abstract

The invention relates to an electroless nickel copper phosphorus alloy plating bath. The copper plating bath contains the eletroless nickel copper phosphorus alloy plating bath, including 15-28g / L of NiSO4 6H2O, 15-25g / L of NaH2PO2 H2O, 0.5-10g / L of CuSO4 5H2O and 30-60g / L of complexing agent. The invention adopts the copper plating bath for carrying out surface nickel copper phosphorus alloy plating on the pre-treated permanent magnet material, so as to obtain uniform and stable coating film, and the surface thereof has favourable anti-corrosion performance, the coating film is in amorphous state nano structure, no obvious crystal boundary is existed, grain size is 3.8-10 nanometer, and the thickness of the coating film is 5-20 nanometer.

Description

technical field [0001] The present invention relates to the field of surface chemical treatment of materials, in particular to the surface chemical nickel-copper-phosphorous plating technology of NdFeB permanent magnet materials, specifically, the present invention relates to an electroless plating solution for electroless nickel-copper-phosphorus alloy plating, And the surface treatment method of the permanent magnet material by using the plating solution. 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 electroplatin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/48C23C18/18
Inventor 白晓刚潘广麾
Owner BEIJING ZHONG KE SAN HUAN HI TECH
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