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Method for performing surface treatment on neodymium-iron-boron permanent magnet material by using nano ceramic

A permanent magnet material and nano-ceramic technology, which is applied to the device for coating liquid on the surface, special surface, pretreatment surface, etc., can solve the problem of affecting the service life of NdFeB permanent magnet materials, reducing product stability and reliability, The NdFeB alloy has poor corrosion resistance and other problems, which can save the surface adjustment process, reduce the cost and shorten the processing time.

Active Publication Date: 2012-04-04
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

Due to the active nature of the rare earth element neodymium in the NdFeB powder alloy, the corrosion resistance of the entire NdFeB alloy becomes very poor, especially in hot and humid environments. The decline or damage of the performance seriously affects the service life of the NdFeB permanent magnet material and reduces the stability and reliability of the product.

Method used

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  • Method for performing surface treatment on neodymium-iron-boron permanent magnet material by using nano ceramic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Will 2.3 kilograms of 18mm sintered NdFeB permanent magnet materials are polished in a vibration mill for 2 hours. Sodium phosphate 20g / liter, sodium carbonate 10g / liter, sodium hydroxide 10g / liter degrease after degreasing, pickling in 1% nitric acid to remove surface oxide, washing with water, nano-ceramic treatment. Wherein the main film-forming agent is 15 grams of E-51 epoxy resin, 25 grams of methyl isobutyl ketone, 50 grams of nano silicon dioxide, and 5 grams of triethanolamine are mixed together for subsequent use. Cured at 120°C for 1.5 hours. The coating thickness is 20 nm. Then carry out salt spray test, PCT test, damp heat test and high temperature demagnetization measurement. It can be seen that the coating has good adhesion, the cross-cut test is qualified, and the anti-corrosion performance is shown in Table 1.

Embodiment 2

[0027] Will 2.3 kilograms of 18mm sintered NdFeB permanent magnet materials are polished in a vibration mill for 2 hours. Sodium phosphate 20g / liter, sodium carbonate 10g / liter, sodium hydroxide 10g / liter degrease after degreasing, pickling in 1% nitric acid to remove surface oxide, washing with water, nano-ceramic treatment. Wherein the main film-forming agent is 25 grams of E-44 epoxy resin, 15 grams of methyl ethyl ketone peroxide, nano-alumina 65, and 20 grams of diethanolamine are mixed together for later use. Cured at 120°C for 1.5 hours. The coating thickness is 20 nm. The coating has good adhesion and is qualified in the scratch test, and the anti-corrosion performance is shown in Table 1.

Embodiment 3

[0029] Will 2.3 kilograms of 18mm sintered NdFeB permanent magnet materials are polished in a vibration mill for 2 hours. Sodium phosphate 20g / liter, sodium carbonate 10g / liter, sodium hydroxide 10g / liter degrease after degreasing, pickling in 1% nitric acid to remove surface oxide, washing with water, nano-ceramic treatment. The main film-forming agent is 20 grams of E-51 epoxy resin, 2 grams of methyl isobutyl ketone, 20 grams of methyl ethyl ketone peroxide, 10 grams of nano-silica, 50 grams of aluminum oxide, 5 grams of triethanolamine, and 12 grams of diethanolamine Mix together and set aside. Cured at 120°C for 1.5 hours. The coating thickness is 23 nm. Then carry out salt spray test, PCT test, damp heat test and high temperature demagnetization measurement. It can be seen that the coating has good adhesion, the cross-cut test is qualified, and the anti-corrosion performance is shown in Table 1.

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Abstract

The invention provides a method for performing surface treatment on a neodymium-iron-boron permanent magnet material by using nano ceramic. The method comprises the following steps of: (1) polishing chamfers; (2) degreasing and removing oil; (3) acid-washing and derusting; (4) treating by using the nano ceramic, namely putting the neodymium-iron-boron permanent magnet material into a nano ceramic plating solution and performing nano ceramic treatment, wherein the nano ceramic plating solution comprises a main film-forming agent, a film-forming aid, a filler and a curing agent, the main film-forming agent is epoxy resin with an amino group or an epoxy group, the film-forming aid is at least one of methyl isobutyl ketone, methyl ethyl ketone peroxide and tert-butyl peroxyacetate, the filler is nano-silicon dioxide and / or alumina, and the curing agent is triethanolamine and / or diethanolamine; and (5) washing and blow-drying to solidify a nano ceramic plated layer. By the surface treatment method, the neodymium-iron-boron permanent magnet material can obtain excellent corrosion resistance, and the high-temperature demagnetization rate of the neodymium-iron-boron permanent magnet material is greatly reduced.

Description

technical field [0001] The invention relates to a surface treatment method of NdFeB permanent magnet materials, in particular to a method for surface treatment of NdFeB permanent magnet materials by using nano ceramics. Background technique [0002] In recent years, the application and development of NdFeB permanent magnet materials is very rapid, and the protection of NdFeB permanent magnet materials is one of the key technologies related to the promotion and application of NdFeB permanent magnet materials. NdFeB permanent magnet materials are mainly prepared from rare earth metals such as neodymium (Nd), iron and boron through powder metallurgy process. As the strongest magnetic material at present, NdFeB permanent magnet materials have been widely used in electroplating devices, machinery, medical treatment, automobiles and other fields, and their application prospects are very broad. [0003] The premise of the application of NdFeB permanent magnet materials is to first...

Claims

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Application Information

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IPC IPC(8): B05D5/00B05D7/14B05D7/24B05D3/00
Inventor 白晓刚潘广麾
Owner BEIJING ZHONG KE SAN HUAN HI TECH
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