Binding neodybium iron boron magnet surface cathode electrophoresis production technology

A cathodic electrophoresis and production process technology, applied in electrophoresis plating, magnetic objects, permanent magnet manufacturing, etc., can solve the problems of poor coating adhesion, low production efficiency, small size, etc., and achieve good anti-rust performance and anti-rust. The effect of high performance and high production efficiency

Inactive Publication Date: 2008-02-20
SHANGHAI NUCLEAR IND NO 8 INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

US Patent 5013411 introduces the powder spraying method, the coating has poor adhesion and unevenness, especially at the corners; the Chinese patent 01047890 applied by Zhejiang University introduces a method and device for coating organic film on NdFeB products ", but the plating time is long and the production efficiency is low; the Chinese patent 01085963 applied by Hu Jingyun introduces a production process of cathodic electrophoretic coating on the surface of NdFeB magnetic materials, but the pre-processing steps of the process are complicated, and after electrophoresis, it needs to be supplemented. Points and other shortcomings, it does not meet the product characteristics of bonded NdFeB magnets with large quantity, small size and many specifications

Method used

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  • Binding neodybium iron boron magnet surface cathode electrophoresis production technology
  • Binding neodybium iron boron magnet surface cathode electrophoresis production technology

Examples

Experimental program
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Effect test

Embodiment 1

[0024] As shown in Figure 1, a bonded neodymium iron boron magnetic ring, the specification is Ф 1 10.2×Ф 2 7.8×L9, put 100 pieces of bonded neodymium iron boron magnetic rings into a large wave liquid cleaning machine for pretreatment to remove magnetic powder and other impurities on the surface of the magnet, and then rinse them with tap water and pure water in two stages.

[0025] The pre-processed magnetic ring is used as a cathode, and is coated in a cathode electrophoresis tank to form an electrophoretic layer. As shown in Figure 2, the figure includes the power source 1, the object to be coated (magnetic ring cathode) 2, the anode plate 3, the diaphragm 4, the paint solution 5, the pump 6, the filter 7, the heat exchanger 8, and the ultrafiltration device 9. 60 kg of electrophoresis solution is prepared, 30 kg of cathodic electrophoresis paint (concentration of 36% by weight) is added to 30 kg of deionized water, and cyclic stirring is performed. The electrophoresis tank is...

Embodiment 2

[0040] As shown in Figure 1, a bonded neodymium iron boron magnetic ring with the same specifications as Example 1. The magnet surface pretreatment is carried out by a large wave liquid cleaning machine. The pretreatment liquid is composed of rust preventive liquid and deionized water. The treatment time For 10 minutes. Using alkaline water as the degreasing agent, the concentration of the alkaline water is 0.1-0.8% by weight, and the magnet is treated in a degreasing tank for 10 minutes at a temperature of 25°C.

[0041] The pre-processed magnetic ring is used as a cathode, and is coated in a cathode electrophoresis tank to form an electrophoretic layer. As shown in Figure 2, the figure includes an anode plate 1, a diaphragm 2, a paint solution 3, a magnetic ring cathode 4, a pump 5, a filter 6, a heat exchanger 7, an ultrafiltration device 8, and a power source 9. 60 kg of electrophoresis solution is prepared, 30 kg of cathodic electrophoresis paint (concentration of 36% by weig...

Embodiment 3

[0047] As shown in Figure 1, a bonded neodymium iron boron magnetic ring with the same specifications as the first embodiment. The pretreatment of the magnet surface is carried out by an ultrasonic device. The pretreatment liquid is composed of anti-rust liquid and deionized water. The treatment time is 40 minutes. Using alkaline water as the degreasing agent, the concentration of the alkaline water is 0.8% by weight, and the magnet is treated in a degreasing tank for 40 minutes at a temperature of 10°C.

[0048] The pre-processed magnetic ring is used as a cathode, and is coated in a cathode electrophoresis tank to form an electrophoretic layer. As shown in Figure 2, the figure includes an anode plate 1, a diaphragm 2, a paint solution 3, a magnetic ring cathode 4, a pump 5, a filter 6, a heat exchanger 7, an ultrafiltration device 8, and a power source 9. 60 kg of electrophoresis solution is prepared, 30 kg of cathodic electrophoresis paint (concentration of 36% by weight) is ad...

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Abstract

This invention refers to a productive process of bonded NdFeB magnets surface cathode electrophoresis which contains preliminary treatment of magnet surface, electrophoresis, turning hanging and solidifying etc. the characteristic of said invention is that the preliminary treatment is simple without steam boiling, phosphorization, passivation and auxiliary point. The equipment is simple, flexible design and high yield.

Description

Technical field [0001] The invention relates to a cathode electrophoresis production process on the surface of a bonded neodymium iron boron magnet, which is used for the mass production of magnets in permanent magnet micro-special motors. Background technique [0002] Bonded neodymium iron boron magnets are widely used in computers, instruments, automobiles, Communication, office automation, industrial automation, electrical engineering, robotics, home appliances and other fields are known as the "pacer" of the information industry in the 21st century. However, the problem that has always been troubled by the magnetic field and the motor field is that the rust prevention problem of bonded NdFeB magnets has not been completely solved. To solve this problem, scientists at home and abroad have studied various protective measures, such as spraying, dipping, electroplating, electrophoresis, vapor deposition, plasma polymerization and so on. US patent 5013411 introduces the powder spr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F41/02C25D13/06
CPCH01F41/026
Inventor 杨小玲高谈英陈刚戴仁新
Owner SHANGHAI NUCLEAR IND NO 8 INST
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