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Low-concentration nickel-plating technology for permanent magnet material

A permanent magnet material and low-concentration technology, applied in the manufacture of inductors/transformers/magnets, electrical components, circuits, etc., can solve the problems of difficult wastewater treatment, high concentration, high cost, etc., and achieve strong impurity resistance and coating binding force Good, low porosity effect

Inactive Publication Date: 2012-05-16
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

Among them, the high concentration brings out the loss, the wastewater treatment is difficult, and the cost is high

Method used

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  • Low-concentration nickel-plating technology for permanent magnet material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Grind 2.3 kg of ￠24*￠15*18mm sintered NdFeB permanent magnet material in a vibrating mill for 2 hours. After degreasing and degreasing by sodium phosphate 20g / L, sodium carbonate 10g / L, and sodium hydroxide 10g / L, pickled in 1% nitric acid to remove surface oxides, and washed with water. Nickel sulfate 30 g / L, sodium chloride 12 g / L, boric acid 45 g / L. Among them, the pH was 5.0, the thickness of the nickel layer was 3 microns, and the grain size was 20 nanometers. Then, the salt spray test, damp heat test and tensile test were carried out, and the corrosion resistance was good, see Table 1.

Embodiment 2

[0019] 2.5 kg of ￠24*￠15*18mm bonded NdFeB permanent magnet material was polished according to the method of Example 1, degreased and degreasing, and pickled. Nickel sulfate 80 g / L, sodium chloride 15 g / L, boric acid 30 g / L. Among them, the pH is 4.0, the grain size is 200 nanometers, and the thickness is 10 micrometers. Then, the salt spray test, damp heat test and tensile test were carried out, and the corrosion resistance was good, see Table 1.

Embodiment 3

[0021] 2.5 kg of ￠24*￠15*18mm sintered NdFeB permanent magnet material was polished according to the method of Example 1, degreased and degreasing, and pickled. Nickel sulfate 40 g / L, sodium chloride 14 g / L, boric acid 40 g / L. Among them, the pH was 4.5, the thickness of the nickel layer was 5.5 microns, and the grain size was 80 nanometers. Then, the salt spray test, damp heat test and tensile test were carried out, and the corrosion resistance was good, see Table 1.

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Abstract

The invention provides a low-concentration nickel-plating surface treatment method for a permanent magnet material. The surface treatment method comprises the following steps of: (1) chamfering and polishing: normally polishing a neodymium-iron-boron permanent magnet material by using a mechanical vibration grinding and barreling chamfering method; (2) degreasing and removing oil: adding sodium phosphate, sodium carbonate or sodium hydroxide for normally degreasing and removing oil; (3) removing rust by acid-washing: adding a nitric acid solution to carry out normal acid-washing rust removal; and (4) plating with low-concentration plating nickel liquid so as to form a nickel layer. The method provided by the invention has the advantages of nickel-saving and power-saving function, good bonding force of the plating layer, strong anti-impurity capability, good displacement, low pore pressure and capability of effectively reducing the cost caused by waste water treatment.

Description

technical field [0001] The invention relates to the field of surface treatment of materials, in particular to the surface treatment technology of NdFeB permanent magnet materials, in particular to a surface treatment method for permanent magnet materials. Background technique [0002] In recent years, the application and development of NdFeB permanent magnet materials have been very rapid, and the success of the protection of NdFeB permanent magnet materials is related to one of the key technologies for the promotion and application of materials. The material is mainly prepared from elements such as rare earth metal neodymium Nd, iron and boron by powder metallurgy process. As the strongest magnetic material at present, it has been widely used in electroplating devices, machinery, medical treatment, automobile and other fields, and the application prospect is very broad. [0003] The premise of the application of NdFeB permanent magnet materials is to first solve the anti-c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D5/34C25D3/12H01F41/00
Inventor 白晓刚潘广麾
Owner BEIJING ZHONG KE SAN HUAN HI TECH
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