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Fluorine-containing metal coating on the surface of a neodymium iron boron rare earth permanent magnet and preparation method thereof

A rare earth permanent magnet and metal coating technology, which is applied to the device, coating, pretreatment surface and other directions of coating liquid on the surface, which can solve the problem of affecting the anti-corrosion effect of the electroplating layer, decreasing the bonding force of the electroplating layer, and prone to pinholes in the coating layer. and other problems, to achieve the effect of low friction coefficient, improve surface adhesion, and improve anti-corrosion ability

Active Publication Date: 2017-12-29
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the traditional electroplating technology, the electroplating solution is acidic, so the initial stage of electroplating causes micro-corrosion on the surface of the magnet, forming a surface unfavorable for electroplating. After electroplating, the bonding force of the electroplating layer decreases, and the coating is prone to defects such as pinholes. Affect the anti-corrosion effect of the electroplating layer
In addition, the electroplating waste solution of zinc and nickel layers has great pollution to the environment, and these shortcomings seriously restrict its further application in related fields.

Method used

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  • Fluorine-containing metal coating on the surface of a neodymium iron boron rare earth permanent magnet and preparation method thereof
  • Fluorine-containing metal coating on the surface of a neodymium iron boron rare earth permanent magnet and preparation method thereof
  • Fluorine-containing metal coating on the surface of a neodymium iron boron rare earth permanent magnet and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] The volume of the neodymium iron boron magnet in this embodiment is 30×30×3mm 3 .

[0040] The fluorine-containing metal coating on the surface of the neodymium iron boron rare earth permanent magnet, the thickness is 20μm, and the composition is based on the mass ratio: PTFE: solid powder: adhesive = 10:25:30; among them, the particle size of PTFE is 3-10μm; the solid powder is Ti powder with a particle size of 1-20μm; the binder is epoxy resin.

[0041] The preparation method of the fluorine-containing metal coating on the surface of the neodymium iron boron rare earth permanent magnet includes the following steps:

[0042] Step 1. Surface pretreatment of NdFeB rare earth permanent magnet:

[0043] Use a spray gun to spray sand with a particle size of 400 meshes onto the surface of the NdFeB rare earth permanent magnet, and remove the oxide layer on the surface of the NdFeB rare earth permanent magnet until the fresh gray surface is exposed; the air injection pressure is 15MP...

Embodiment 2

[0055] The volume of the neodymium iron boron magnet of this embodiment is 40×20×3mm 3 .

[0056] The fluorine-containing metal coating on the surface of the neodymium iron boron rare earth permanent magnet is 5μm in thickness, and the composition is based on the mass ratio: PTFE: solid powder: adhesive = 5:15:35; among them, the particle size of PTFE is 0.1~5μm; solid powder is TiO 2 Powder, the particle size is 10-50μm; the binder is mixed resin P-200.

[0057] The preparation method of the fluorine-containing metal coating on the surface of the neodymium iron boron rare earth permanent magnet includes the following steps:

[0058] Step 1. Surface pretreatment of NdFeB rare earth permanent magnet:

[0059] Use a spray gun to spray sand grains with a particle size of 1000 onto the surface of the neodymium iron boron rare earth permanent magnet, remove the oxide layer on the surface of the neodymium iron boron rare earth permanent magnet, until the fresh gray surface is exposed; where...

Embodiment 3

[0071] The volume of the neodymium iron boron magnet of this embodiment is 20×20×10mm 3 .

[0072] The fluorine-containing metal coating on the surface of the neodymium iron boron rare earth permanent magnet is 20μm in thickness, and the composition is based on the mass ratio: PTFE: solid powder: adhesive = 15: 30: 31; among them, the particle size of PTFE is 10-20μm; the solid powder composition is based on mass ratio, Al powder: Zn powder=1:2, particle size is 3-15μm; binder is phenolic resin.

[0073] The preparation method of the fluorine-containing metal coating on the surface of the neodymium iron boron rare earth permanent magnet includes the following steps:

[0074] Step 1. Surface pretreatment of NdFeB rare earth permanent magnet:

[0075] Use a spray gun to spray sand with a particle size of 600 mesh onto the surface of the neodymium iron boron rare earth permanent magnet, and remove the oxide layer on the surface of the neodymium iron boron rare earth permanent magnet unti...

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Abstract

A fluorine-containing metal coating on the surface of a neodymium-iron-boron rare earth permanent magnet and a preparation method thereof, belonging to the field of anti-corrosion surface treatment technology; a fluorine-containing metal coating on the surface of a neodymium-iron-boron rare earth permanent magnet, with a thickness of 5 to 40 μm, and the composition is determined by mass The ratio is: polytetrafluoroethylene: solid powder: adhesive = (1~30): (2~30): (20~40); the preparation method includes: (1) degreasing and pickling or sandblasting Method: Pretreat the surface of NdFeB rare earth permanent magnet; (2) Use centrifugal dipping or spraying method to prepare the coating. The polytetrafluoroethylene contained in the coating used to prepare the coating of the present invention has excellent corrosion resistance and can improve the anti-corrosion ability of the surface of the NdFeB rare earth permanent magnet; during the coating process, no acidic plating solution is used. , the fresh surface of the magnet is not damaged, which can effectively improve the surface bonding force between the coating and the magnet; because there is no acidic waste liquid, it does not cause pollution to the environment, and it is a green and environmentally friendly coating process.

Description

Technical field [0001] The invention belongs to the technical field of anti-corrosion surface treatment, and particularly relates to a fluorine-containing metal coating on the surface of a neodymium iron boron rare earth permanent magnet and a preparation method thereof. Background technique [0002] With its excellent magnetic properties, NdFeB rare earth permanent magnets are widely used in various permanent magnet motors, wind power generation, nuclear magnetic resonance imaging, computer hard disk drives, mobile phone vibration motors, audio and other fields. However, neodymium iron boron contains rare earth elements and is easily oxidized, especially the neodymium-rich phase at the grain boundary is particularly easy to be corroded. Therefore, in applications, the surface of the magnet usually needs to be treated with anticorrosion. The anti-corrosion method widely used at present is electroplating. A thin layer of zinc, or nickel, copper, nickel is deposited on the surface...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D163/00C09D161/06C09D133/26C09D1/00C09D5/10C09D5/08C09D7/12B05D1/12B05D1/18B05D1/38B05D3/02B05D3/10B05D3/12
CPCB05D1/12B05D1/18B05D1/38B05D3/0254B05D3/104B05D3/12B05D2203/00B05D2401/32B05D2506/15B05D2601/28C08K2201/014C08L2201/08C09D1/00C09D5/08C09D5/10C09D5/103C09D5/106C09D133/26C09D161/06C09D163/00C08L27/18C08K2003/0881C08K2003/2241C08K2003/0893C08K2003/0812
Inventor 裴文利
Owner NORTHEASTERN UNIV LIAONING