A process for strengthening the surface of NdFeB magnets

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By using injection coating or carbonitrile co-permeation treatment on the surface of the NdFeB magnet to form a protective layer, the deposition roughness caused by the influence of magnetic field during electroplating is solved, and the effect of extending service life and improving durability and wear resistance is achieved.

CN117410092BActive Publication Date: 2025-03-25DONGGUAN ZHONGWANG PERMANENT MAGNET TECH CO LTD

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Patent Information

Application Number: CN202311621088.4
Authority / Receiving Office: CN · China
Patent Type: Patents(China)
Current Assignee / Owner
Filing Date: 2023-11-29
Publication Date: 2025-03-25
Estimated Expiration: 2043-11-29

Application Information

Patent Timeline

29 Nov 2023

Application

CN202311621088.4

25 Mar 2025

Publication

CN117410092B

IPC: H01F41/02; H01F1/057; H01F13/00

CPC: H01F41/026; H01F1/057; H01F13/003

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Application Domain

Magnetic materials Permanent magnet manufacture

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AI Technical Summary

Technical Problem

During the electroplating process, neodymium iron boron magnets are prone to rough deposits due to the influence of magnetic fields, which are prone to problems such as pitting and burrs.

Method used

The surface of the neodymium iron boron magnet is strengthened by injection coating treatment system or carbonitridine co-permeation treatment system to form a protective layer to improve surface hardness and wear resistance.

Benefits of technology

By forming a protective layer, it effectively prevents oxidation and corrosion, extends the service life of the magnet, improves its durability and reliability, and enhances its wear resistance.

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Abstract

The invention relates to the technical field of NdFeB magnets, and in particular discloses a strengthening process method for the surface of NdFeB magnets. The method comprises strengthening the surface of the NdFeB magnets through a surface strengthening treatment unit. The surface strengthening treatment unit comprises an injection coating treatment system or a carbonitriding treatment system. A protective film is coated on the surface of the magnet by injection molding at one time without cutting and polishing. Through the injection coating treatment, a protective film can be formed on the surface of the magnet to effectively prevent oxidation and corrosion, thereby extending the service life of the magnet. This can reduce the oxidation and corrosion problems of the magnet in harsh environments such as high temperature and high humidity, improve the durability and reliability of the magnet, and at the same time increase the hardness and wear resistance of the magnet surface, thereby improving the wear resistance of the magnet, making it less prone to wear during frequent use, and improving the stability and reliability of the magnet.

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