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Surface protection of neodymium iron boron permanent-magnet material

A permanent magnet material, NdFeB technology, applied in the field of chemical surface treatment of materials, can solve the problems of complex post-treatment process, dullness, poor adhesion, etc., and achieve good anti-corrosion effect, good adhesion and good stability Effect

Active Publication Date: 2007-09-05
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

Compared with the traditional copper-selenium blackening film, the existing blackening film generally has disadvantages such as poor blackness, dullness, poor corrosion resistance, and poor bonding force, and cannot meet the requirements of industrial production.
Copper-selenium blackening film is not only expensive, but also has complicated post-treatment process, high production cost, and unsatisfactory working environment, which limits its application.
At present, the use of non-toxic or low-toxic non-selenium blackening solution to treat the material surface to obtain a chemical conversion coating with superior performance is the frontier of blackening film at home and abroad, but there are few related reports on the use of molybdenum-aluminum layer

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Polish 2.3 kg of ￠24*99*7mm NdFeB permanent magnet material in a vibration mill for 2 hours. After degreasing and degreasing by sodium phosphate 20g / L, sodium carbonate 10g / L and sodium hydroxide 10g / L, pickle in 1% nitric acid to remove surface oxides, wash 3 times with water, and then activate blackening with 5% sulfuric acid . Put the above-mentioned pretreated NdFeB permanent magnet material into the blackening solution, the composition of the blackening solution is 13g / L of ammonium molybdate and 40g / L of aluminum ammonium sulfate. React in a drum for 5 minutes at 45°C to form a blue-black protective film on the surface of the NdFeB permanent magnet material. Take out the NdFeB permanent magnet material, wash it twice, seal it with soapy water, wash it, dry it, and pack the finished product.

Embodiment 2

[0035] Polish 2.5 kg of ￠24*9*7mm NdFeB permanent magnet material according to the method of Example 1, degrease and degrease, pickle and activate. Put the pretreated NdFeB permanent magnet material into the blackening solution. The composition of the blackening liquid is ammonium molybdate 13g / L, aluminum sulfate 40g / L, sodium fluoride 15g / L, EDTA 20g / L, and ammonia water 10ml / L. React in a drum for 5 minutes at 45°C to form a blue-black protective film on the surface of the NdFeB permanent magnet material. Take out the NdFeB permanent magnet material, wash it twice, seal it with soapy water, wash it, dry it, and pack the finished product.

Embodiment 3

[0037] Polish 2.5 kg of ￠24*9*7mm NdFeB permanent magnet material according to the method of Example 1, degrease and degrease, pickle and activate. Put the pretreated NdFeB permanent magnet material into the blackening solution. , The composition of the blackening liquid is sodium molybdate 13g / L, aluminum sulfate 15g / L, sodium fluoride 5g / L. React in a drum for 30 minutes at 40°C to form a blue-black protective film on the surface of the NdFeB permanent magnet material. Take out the NdFeB permanent magnet material, wash it with water three times, then seal it with soapy water, wash it with water, dry it, and pack the finished product.

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PUM

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Abstract

A surface protection technology of neodymium-ferrous-boron permanent magnetic material is carried out by grinding for neodymium-ferrous-boron permanent magnetic material, degreasing while removing oil, removing rust while acid cleaning, activating acid liquid, putting it into black liquid or blue liquid, chemically coating and forming into blue-black or dark blue protection film. It has excellent combination and anti-corrosion performances.

Description

technical field [0001] The invention relates to the field of surface chemical treatment of materials, in particular to the surface protection technology of NdFeB 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 prepared from elements such as rare earth metal 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 first solve the anti-corrosion problem of NdFeB permanent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/62C23C22/78
Inventor 白晓刚潘广麾
Owner BEIJING ZHONG KE SAN HUAN HI TECH
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