Neodymium iron boron magnet surface anti-corrosion treatment method

An anti-corrosion treatment, NdFeB technology, applied in the direction of surface pretreatment, machine tools for surface polishing, devices for coating liquid on the surface, etc., can solve the problems of insufficient surface treatment of NdFeB magnets before anti-corrosion, and improve the appearance of inconsistency Phenomenon, reduce uncontrollable factors, high cleanliness effect

Active Publication Date: 2020-01-03
YANTAI ZHENGHAI MAGNETIC MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention aims at the problem of insufficient surface treatment of the existing NdFeB ma

Method used

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  • Neodymium iron boron magnet surface anti-corrosion treatment method

Examples

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Effect test

Embodiment 1-1

[0049] A method for anticorrosion treatment of the surface of an NdFeB magnet, the steps of which are:

[0050](1) Put the NdFeB product into a vibrating finishing machine for dry grinding. The abrasive is resin abrasive M1 doped with silicon carbide. The frequency of the equipment is 50Hz. Abrasive: product = 6:1 (weight ratio), and the time is 40min , the product roughness after grinding is 0.2μm;

[0051] (2) After the treatment in (1), the product is phosphated by dipping method. The phosphating time is 5 minutes, and the temperature of the phosphating solution is 50°C. After phosphating, the product is washed, dried, and dried to obtain product A01.

Embodiment 1-2

[0053] A method for anticorrosion treatment of the surface of an NdFeB magnet, the steps of which are:

[0054] (1) Put the NdFeB product into a vibrating finishing machine for dry grinding. The abrasive is resin abrasive M1 doped with silicon carbide. The frequency of the equipment is 50Hz. Abrasive: product = 6:1 (weight ratio), and the time is 30min , the product roughness after grinding is 0.8μm;

[0055] (2) After the treatment in (1), the product is phosphated by dipping method. The phosphating time is 5 minutes, and the temperature of the phosphating solution is 50°C. After phosphating, the product is washed, dried, and dried to obtain product A02.

Embodiment 1

[0068] The whole process of embodiment 1 (A01 and A02) and comparative example 1 (A1) has no loss of base material, but the pretreatment process of comparative example 2 (A2) can cause the loss of each 0.01mm of product length, width and thickness, making the cost increase high. Namely: Embodiments A01 and A02 and the NdFeB magnet surface anticorrosion treatment process using abrasive M1 replace the degreasing-water washing-(pickling-water washing) process, simplify the process flow, and have no substrate loss and consistent appearance Good performance and lower cost.

[0069] And Example 1-1 is compared with 1-2, the appearance results are consistent, but the roughness of the ground product has a slight impact on the heat and humidity resistance of the magnet, that is, the product with a roughness of 0.8 μm after grinding is better than the product after grinding For products with a roughness of 0.2 μm.

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Abstract

The invention discloses a neodymium iron boron magnet surface anti-corrosion treatment method. The method comprises two steps of pretreatment and anti-corrosion treatment. According to the method, after abrasive pretreatment is performed, the roughness of a neodymium iron boron magnet is between 0.2-2.0 micrometers, phosphating can be directly carried out, the corrosion resistance of phosphated products subjected to acid pickling can be effectively improved, and the phenomenon of appearance inconsistency of the directly-phosphated products without being subjected to acid pickling can be avoided; electroplating can be directly carried out without degreasing and acid pickling, so that the influence on the hydrogen content on the surface and the influence on the magnetic flux of the productsin the acid pickling process are avoided; and electrophoresis, spraying or physical vapor deposition and the like can be directly carried out without phosphating, so that the influence on the hydrogencontent on the surface and the influence on the magnetic flux of the products in the acid pickling process are avoided, steps such as phosphating are saved, so that uncontrollable factors of the phosphating process are reduced, and waste water and waste residues are not generated, so that the environmental protection performance of the production process is improved.

Description

technical field [0001] The invention relates to magnetic materials, in particular to a surface anticorrosion treatment method of an NdFeB magnet. Background technique [0002] Based on the advantages of NdFeB magnets, they are widely used in information technology, automobiles, motors, wind power, hybrid vehicles and other industries. NdFeB magnets are made of Nd 2 Fe 14 The B main phase and the intergranular Nd-rich phase are composed. The electrochemical potential difference between the phases of this multi-phase structure is large, which is easy to cause electrochemical corrosion, and neodymium is one of the elements with high chemical activity, which is very prone to corrosion. , so surface treatment must be carried out to prevent corrosion before application. The surface anticorrosion methods of NdFeB magnets include phosphating, electroplating, electrophoresis, spraying and physical vapor deposition, etc. The treatment process before anticorrosion is extremely impor...

Claims

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Application Information

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IPC IPC(8): C23C22/78C25D5/36C25D13/20C23C14/02B05D3/12B24B31/14B24B31/00
CPCC23C22/78C25D5/36C25D13/20C23C14/028B05D3/002B05D3/12B24B31/14B24B31/00
Inventor 李志强刘艳魏蕊王鹏飞
Owner YANTAI ZHENGHAI MAGNETIC MATERIAL CO LTD
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