Fluorine-containing metal coating on surface of NdFeB rare-earth permanent magnet and preparation method of fluorine-containing metal coating

A rare-earth permanent magnet and metal coating technology, which is applied to the device for coating liquid on the surface, the coating, and the pre-treated surface, etc., can solve the problem of affecting the anti-corrosion effect of the electroplating layer, the decrease of the bonding force of the electroplating layer, and the easy occurrence of pinholes in the coating And other problems, to achieve the effect of low friction coefficient, improve surface bonding force, improve anti-corrosion ability

Active Publication Date: 2016-05-25
NORTHEASTERN UNIV
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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 surface of NdFeB rare-earth permanent magnet and preparation method of fluorine-containing metal coating
  • Fluorine-containing metal coating on surface of NdFeB rare-earth permanent magnet and preparation method of fluorine-containing metal coating
  • Fluorine-containing metal coating on surface of NdFeB rare-earth permanent magnet and preparation method of fluorine-containing metal coating

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Embodiment 1

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

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

[0041] A method for preparing a fluorine-containing metal coating on the surface of an NdFeB rare earth permanent magnet, comprising the following steps:

[0042] Step 1, surface pretreatment of NdFeB rare earth permanent magnets:

[0043] Use a spray gun to spray sand particles with a particle size of 400 mesh on the surface of the NdFeB rare earth permanent magnet, remove the oxide layer on the surface of the NdFeB rare earth permanent magnet, and expose the fresh off-white surface; wherein, the spray pressure is 15M...

Embodiment 2

[0055] The volume of the NdFeB magnet in this embodiment is 40×20×3mm 3 .

[0056] The fluorine-containing metal coating on the surface of the NdFeB rare earth permanent magnet has a thickness of 5 μm, and the composition is by mass ratio, polytetrafluoroethylene: solid powder: binder = 5: 15: 35; wherein, the particle size of polytetrafluoroethylene is 0.1~5μm; solid powder is TiO 2 powder, the particle size is 10-50μm; the binder is mixed resin P-200.

[0057] A method for preparing a fluorine-containing metal coating on the surface of an NdFeB rare earth permanent magnet, comprising the following steps:

[0058] Step 1, surface pretreatment of NdFeB rare earth permanent magnets:

[0059] Use a spray gun to spray sand particles with a particle size of 1000 mesh on the surface of the NdFeB rare earth permanent magnet, remove the oxide layer on the surface of the NdFeB rare earth permanent magnet, until the fresh gray surface is exposed; wherein, the spray pressure is 1MPa;...

Embodiment 3

[0071] The volume of the NdFeB magnet in this embodiment is 20×20×10mm 3 .

[0072] The fluorine-containing metal coating on the surface of the NdFeB rare earth permanent magnet has a thickness of 20 μm, and the composition is based on the mass ratio, polytetrafluoroethylene: solid powder: binder = 15:30:31; wherein, the particle size of polytetrafluoroethylene is 10-20μm; solid powder composition by mass ratio, Al powder: Zn powder = 1:2, particle size 3-15μm; binder is phenolic resin.

[0073] A method for preparing a fluorine-containing metal coating on the surface of an NdFeB rare earth permanent magnet, comprising the following steps:

[0074] Step 1, surface pretreatment of NdFeB rare earth permanent magnets:

[0075] Use a spray gun to spray sand particles with a particle size of 600 mesh on the surface of the NdFeB rare earth permanent magnet, remove the oxide layer on the surface of the NdFeB rare earth permanent magnet, and expose the fresh off-white surface; where...

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Abstract

The invention discloses a fluorine-containing metal coating on the surface of an NdFeB rare-earth permanent magnet and a preparation method of the fluorine-containing metal coating, and belongs to the technical field of anticorrosion surface treatment. The fluorine-containing metal coating has the thickness of 5-40 microns and is prepared from polytetrafluoroethylene, solid powder and adhesive according to the mass ratio of (1-30):(2-30):(20-40). The preparation method includes the steps of firstly, preprocessing the surface of the NdFeB rare-earth permanent magnet through an oil removal and acid pickling or sand blasting method; secondly, preparing the coating through a centrifugal soaking and throwing or spraying method. Polytetrafluoroethylene contained in paint for preparing the coating has excellent corrosion resistance, and the corrosion resistant capacity of the surface of the NdFeB rare-earth permanent magnet can be improved; in the coating process, no acid bath is used, the fresh surface of the magnet is not damaged after preprocessing, and the surface adhesion force between the coating and the magnet can be effectively improved; no acid waste liquid exists, the environment is not polluted, and the preparation method belongs to the green and environment-friendly coating process.

Description

technical field [0001] The invention belongs to the technical field of anti-corrosion surface treatment, in particular to a fluorine-containing metal coating on the surface of an NdFeB rare earth permanent magnet and a preparation method thereof. Background technique [0002] NdFeB rare earth permanent magnets are widely used in various permanent magnet motors, wind power generation, nuclear magnetic resonance imaging, computer hard drives, mobile phone vibration motors, audio and other fields due to their excellent magnetic properties. However, since NdFeB contains rare earth elements, it is easy to be oxidized, especially the Nd-rich phase at the grain boundary is particularly easy to be corroded, so in application, it is usually necessary to carry out surface anti-corrosion treatment on the magnet. The most widely used anti-corrosion method is electroplating. Deposit zinc or a thin layer of nickel-copper-nickel on the surface of NdFeB to isolate NdFeB from the external e...

Claims

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Application Information

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Patent Type & Authority Applications(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
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