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Coating method of neodymium-iron-boron magnets

A neodymium-iron-boron coating technology, which is applied in the direction of surface coating liquid devices, coatings, anti-corrosion coatings, etc., can solve the problem of poor coating adhesion and salt spray corrosion resistance, poor corrosion resistance, and incomplete maturity and other problems, to achieve the effects of easy control of uniformity, improved corrosion resistance, and improved adhesion

Active Publication Date: 2014-11-19
BEIJING JINGCI ELECTRIC TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the existing technology, NdFeB magnet manufacturers generally adopt traditional process modes such as electro-galvanizing, nickel-copper-nickel, and electrophoresis, but these processes have many shortcomings such as poor corrosion resistance, low production efficiency, and serious pollution.
Therefore, in recent years, the industry has turned its attention to the technology of zinc-aluminum coating on the surface of NdFeB magnets. This coating has excellent heat corrosion resistance, no hydrogen embrittlement, no pollution, soft appearance, and Due to the advantages of further coating and excellent permeability, it is widely used in steel parts and other industries such as automobiles, electronics, civil engineering, ships, and home appliances. However, due to the immature technology, there are still poor adhesion and salt spray corrosion resistance of the coating. And other issues

Method used

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  • Coating method of neodymium-iron-boron magnets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] First weigh 20g of flaky zinc powder with a particle size of 3.2μm, 10g of flaky aluminum powder with a particle size of 3.2μm, 0.5g of magnesium oxide, 1.0g of organic solvent polyethylene glycol, 1.0g of phytic acid, 1.0g of Alkylphenol polyoxyethylene ether, 0.3g of silane coupling agent KH-550 and 1.0g of polytetrafluoroethylene were thoroughly mixed and stirred to obtain a zinc-aluminum coating solution.

[0070] Use 1.5kg of sintered NdFeB permanent magnet material with a size of D40*D24*4mm to vibrate, grind and polish in a vibrating chamfering machine to remove burrs and oxide scales. Then put it in the ultrasonic wave, under the condition of 50℃, pour 20g / L alkaline solution to degrease and degrease the NdFeB magnet. Under certain conditions, use secondary flowing water to clean, and observe the residual solution in the previous process until it is completely cleaned.

[0071] Then put the NdFeB magnet obtained in the above steps into a nitric acid solution wi...

Embodiment 2

[0078] First weigh 20g of flaky zinc powder with a particle size of 3.2μm, 10g of flaky aluminum powder with a particle size of 3.2μm, 0.5g of magnesium oxide, 1.0g of organic solvent polyethylene glycol, 1.0g of phytic acid, 1.0g of Alkylphenol polyoxyethylene ether, 0.3g of silane coupling agent KH-550 and 1.0g of polytetrafluoroethylene are fully mixed and stirred to obtain a zinc-aluminum coating solution; aluminum powder, epoxy resin, polyamide resin , methyl etherified amino resin and organic solvent ethylene glycol, after fully mixing and stirring, obtain epoxy resin containing 150g / L aluminum powder, 450ml / L organosilicon modification, 300ml / L polyamide resin, 300ml / L formazan Organic coating solution for etherified amino resin.

[0079] Use 1.5kg of sintered NdFeB permanent magnet material with a size of D40*D24*4mm to vibrate, grind and polish in a vibrating chamfering machine to remove burrs and oxide scales. Then put it in the ultrasonic wave, under the condition ...

Embodiment 3

[0086] First weigh 20g of flaky zinc powder with a particle size of 3.2μm, 10g of flaky aluminum powder with a particle size of 3.2μm, 0.5g of magnesium oxide, 1.0g of organic solvent polyethylene glycol, 1.0g of phytic acid, 1.0g of Alkylphenol polyoxyethylene ether, 0.3g of silane coupling agent KH-550 and 1.0g of polytetrafluoroethylene are fully mixed and stirred to obtain a zinc-aluminum coating solution; aluminum powder, epoxy resin, polyamide resin , methyl etherified amino resin and organic solvent ethylene glycol, after fully mixing and stirring, obtain epoxy resin containing 150g / L aluminum powder, 450ml / L organosilicon modification, 300ml / L polyamide resin, 300ml / L formazan Organic coating solution for etherified amino resin.

[0087] Use 1.5kg of sintered NdFeB permanent magnet material with a size of D40*D24*4mm to vibrate, grind and polish in a vibrating chamfering machine to remove burrs and oxide scales. Then put it in the ultrasonic wave, under the condition ...

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Abstract

The invention provides a zinc-aluminum coating liquid of neodymium-iron-boron magnets and a coating method. The coating method includes the following steps that the surfaces of the neodymium-iron-boron magnets are coated with the zinc-aluminum coating liquid comprising 20-40 parts by weight of zinc, 10-20 parts by weight of aluminum, 0.5-1.0 part by weight of oxide, 1.0-2.0 parts by weight of organic solvents, 1.0-2.0 parts by weight of phytic acid, 1.0-2.0 parts by weight of alkylphenol ethoxylates, 0.3-1.0 part by weight of silane coupling agent and 1.0-5.0 parts by weight of polytetrafluoroethylene, and the coated neodymium-iron-boron magnets are obtained. According to the zinc-aluminum coating liquid coating method of the neodymium-iron-boron magnets, coatings are made to have high adhesive force and salt fog resistance.

Description

technical field [0001] The invention belongs to the technical field of magnet preparation, and in particular relates to a coating method of an NdFeB magnet. Background technique [0002] A magnet is a substance that can generate a magnetic field and has the property of attracting ferromagnetic substances such as iron, nickel, cobalt and other metals. Magnets are generally divided into permanent magnets and soft magnets. Most of the materials used as magnetizers and electromagnets are soft magnets, and their polarity changes with the polarity of the applied magnetic field; permanent magnets are hard magnets, which can maintain their magnetic properties for a long time. , It is not easy to lose magnetization, and it is not easy to be magnetized. Therefore, whether in industrial production or in daily life, hard magnets are one of the most commonly used strong materials. [0003] Hard magnets can be divided into natural magnets and artificial magnets. Artificial magnets mean ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D1/12C09D1/00C09D5/10C09D7/12
Inventor 高政
Owner BEIJING JINGCI ELECTRIC TECH CO LTD
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