Sintered NdFeB magnet surface high anti-corrosion coating and preparation method thereof

A NdFeB, high corrosion-resistant technology, applied in coating, metal material coating process, fusion spraying, etc., can solve the problems of environmental pollution, poor corrosion resistance, etc. Strong thermal shock resistance and outstanding material composite effect

Active Publication Date: 2019-03-15
EARTH PANDA ADVANCE MAGNETIC MATERIAL
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Based on this, the present invention provides a high corrosion-resistant coating on the surface of a sintered NdFeB magnet and a preparation method thereof, wherein nano-zirconia, nano-aluminum powder and nano-zinc powder are prepared on the surface of a sintered NdFeB magnet by means of plasma spraying. The composed nanostructure coating solves the problem of poor corrosion resistance of conventional coatings on the surface of sintered NdFeB magnets and the environmental pollution problems that are easily caused during production, preparation and use. The high corrosion resistance prepared by the preparation method of the present invention The coating has good flexibility, adhesion, impact resistance, wear resistance, high temperature resistance and corrosion resistance, which can provide longer-term corrosion protection for sintered NdFeB magnets

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The sintered NdFeB magnet in this embodiment is a block-shaped sintered NdFeB magnet with a specification of 20×12×3 mm (provided by Anhui Didixiong New Materials Co., Ltd.; brand: 42SH; state: unmagnetized).

[0024] a. Granulation: The nanoparticles are granulated by spray drying to obtain coating particles with a particle size of 10 μm. A mixture of nano-zinc powder with a diameter of 30nm, wherein the mass fractions of nano-zirconia, nano-aluminum powder and nano-zinc powder are 80%, 12%, and 8% respectively;

[0025] b. Substrate pretreatment: Sandblasting the sintered NdFeB magnets in sequence (the sandblasting material is 100-mesh brown corundum, the angle of sandblasting treatment is 30°, and the time is 1min), pickling (3wt% nitric acid solution, acid Washing time is 30s), water washing (ultrasonic cleaning in deionized water for 3min);

[0026] c. Substrate preheating: heat the pretreated sintered NdFeB magnet to make the substrate temperature reach 100°C, an...

Embodiment 2

[0029] The sintered NdFeB magnet in this example is a block-shaped sintered NdFeB magnet with a specification of 20×12×3mm (provided by Anhui Didixiong New Materials Co., Ltd.; brand: 42SH; state: unmagnetized) for testing .

[0030] a. Granulation: The nanoparticles are granulated by spray drying to obtain coating particles with a particle size of 30 μm. A mixture of nano-zinc powder with a diameter of 40nm, wherein the mass fractions of nano-zirconia, nano-aluminum powder and nano-zinc powder are 85%, 12%, and 3% respectively;

[0031] b. Substrate pretreatment: Sandblasting the sintered NdFeB magnets in sequence (the sandblasting material is 200-mesh brown corundum, the angle of sandblasting treatment is 45°, and the time is 2min), pickling (4wt% nitric acid solution, acid Washing time is 40s), water washing (ultrasonic cleaning in deionized water for 4min);

[0032] c. Substrate preheating: heat the pretreated sintered NdFeB magnet to make the substrate temperature reach 1...

Embodiment 3

[0035] The sintered NdFeB magnet in this example is a block-shaped sintered NdFeB magnet with a specification of 20×12×3mm (provided by Anhui Didixiong New Materials Co., Ltd.; brand: 42SH; state: unmagnetized) for testing .

[0036] a. Granulation: The nanoparticles are granulated by spray drying to obtain coating particles with a particle size of 50 μm. A mixture of nano-zinc powder with a diameter of 50nm, wherein the mass fractions of nano-zirconia, nano-aluminum powder and nano-zinc powder are 90%, 8%, and 2% respectively;

[0037] b. Substrate pretreatment: Sandblasting the sintered NdFeB magnets in sequence (the sandblasting material is 300 mesh brown corundum, the angle of sandblasting treatment is 60°, and the time is 3min), pickling (5wt% nitric acid solution, acid Washing time is 50s), water washing (ultrasonic cleaning in deionized water for 5min);

[0038] c. Substrate preheating: heat the pretreated sintered NdFeB magnet to make the substrate temperature reach ...

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Abstract

The invention provides a sintered NdFeB magnet surface high anti-corrosion coating and a preparation method thereof. The preparation method includes the following steps: nanoparticles are subjected togranulation treatment to obtain coating particles, wherein the nanoparticles are a mixture of nanometer zirconia, nanometer aluminum powder and nanometer zinc powder; the pretreated sintered NdFeB magnet surface is preheated; and a nanometer-structured coating is prepared on the preheated sintered NdFeB magnet surface by adopting a plasma spraying mode. The nanometer-structured coating composed of the nanometer-zirconia, the nanometer-aluminum powder and the nanometer-zinc powder is prepared on the preheated sintered NdFeB magnet surface by adopting the plasma spraying mode, the problems of poor anti-corrosion and environmental pollution during production, preparation and usage process of a conventional coating on the sintered NdFeB magnet surface are solved. The high anti-corrosion coating prepared according to the preparation method has good flexibility, adhesion, impact resistance, wear resistance, high-temperature resistance and anti-corrosion, and the sintered NdFeB magnet can beprevented from corrosion persistently by the anti-corrosion coating.

Description

technical field [0001] The invention belongs to the field of surface protection of permanent magnet materials, in particular to a high corrosion-resistant coating on the surface of a sintered NdFeB magnet and a preparation method thereof. Background technique [0002] The third-generation NdFeB (NdFeB) series rare earth permanent magnet materials are favored for their excellent magnetic properties and high cost performance, and are widely used in various types of motors, medical equipment, instruments, automotive industry, aerospace and cutting-edge technology field. The sintered NdFeB magnet prepared by powder metallurgy process is composed of the main phase Nd 2 Fe 14 B. Composed of Nd-rich phase and B-rich phase, the potential difference between the three phases is relatively large, especially the Nd-rich phase has the strongest electrochemical property, and is easily corroded in humid, high temperature and electrochemical environments, which is severely limited It has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/06
CPCC23C4/06C23C4/134
Inventor 曹玉杰赵占中吴玉程黄秀莲刘家琴陈静武衣晓飞
Owner EARTH PANDA ADVANCE MAGNETIC MATERIAL
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