Surface strengthening treatment method of neodymium-iron-boron permanent magnet and application of surface strengthening treatment method

A technology of surface strengthening and treatment method, applied in the direction of cleaning methods, cleaning methods and utensils, chemical instruments and methods using liquids, etc. and other problems, to achieve the effect of improving the surface state, good temperature and humidity resistance, and prolonging the time of neutral salt spray corrosion resistance.

Active Publication Date: 2021-06-18
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The study found that the zinc-aluminum coating has high corrosion resistance, but the coating has obvious defects: the coating has low hardness, poor bonding with the substrate, and the wear resistance and heat and humidity resistance are not ideal, especially for those with special shapes. Fasteners, not suitable for protective modification with zinc-aluminum coating

Method used

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  • Surface strengthening treatment method of neodymium-iron-boron permanent magnet and application of surface strengthening treatment method
  • Surface strengthening treatment method of neodymium-iron-boron permanent magnet and application of surface strengthening treatment method
  • Surface strengthening treatment method of neodymium-iron-boron permanent magnet and application of surface strengthening treatment method

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preparation example Construction

[0048] Another aspect of the embodiments of the present invention also provides a method for preparing a surface coating of an NdFeB permanent magnet, which includes:

[0049] Using the aforementioned surface strengthening treatment method to carry out surface strengthening treatment on the NdFeB permanent magnet;

[0050] And, applying a coating liquid to the surface of the NdFeB permanent magnet, so as to form a protective coating on the surface of the NdFeB permanent magnet.

[0051] In some more specific embodiments, the protective coating includes a ZnAl coating, but is not limited thereto.

[0052] In some more specific embodiments, the coating liquid includes inorganic metal powder, but is not limited thereto.

[0053] Further, the inorganic metal powder is nanoscale inorganic metal powder.

[0054] Further, the inorganic metal powder includes any one or a combination of two or more of alumina, manganese oxide, titanium dioxide, and cerium oxide, but is not limited th...

Embodiment 1

[0079] 1. Wire cutting process Φ15mm×10mm, 26mm×20mm×7mm (length×width×height) and 5mm×10mm×10mm (r inner × r outer × h) three kinds of NdFeB permanent magnets, and on the cylindrical grinding machine Polishing and cleaning;

[0080] 2. Surface strengthening treatment of NdFeB permanent magnets:

[0081] (1) The magnet after wire cutting is mechanically polished on a grinding machine;

[0082] (2) Place the NdFeB permanent magnet in the self-contained dust-removing sandblasting machine for surface roughening, the particle size of the quartz sand is 1mm, the air pressure is 0.5MPa, and the sandblasting time for one side is 3min;

[0083] (3) Etching the NdFeB permanent magnet obtained in step (2) in a strong alkaline solution, the solution composition: sodium hydroxide (industrial grade) 10g / L, trisodium phosphate (industrial grade) 45g / L, The rest is deionized water, the pH value is 11, the temperature is 80°C, the ultrasonic frequency is 60kHz, and the treatment time is 40m...

Embodiment 2

[0098] 1. Two specifications of NdFeB permanent magnets of Φ15mm×10mm and 26mm×20mm×7mm (length×width×height) are processed by wire cutting, and polished and cleaned on the cylindrical grinder;

[0099] 2. Surface strengthening treatment of NdFeB permanent magnets:

[0100] (1) The magnet after wire cutting is mechanically polished on a grinding machine;

[0101] (2) Place the NdFeB permanent magnet in the self-contained dust-removing sandblasting machine for surface roughening, the particle size of the quartz sand is 2mm, the air pressure is 0.5MPa, and the sandblasting time for one side is 3min;

[0102] (3) Etching the NdFeB permanent magnet obtained in step (2) in a strong alkaline solution, the solution composition: sodium hydroxide (industrial grade) 25g / L, trisodium phosphate (industrial grade) 50g / L, The rest is deionized water, the pH value is 13, the temperature is 100°C, the ultrasonic frequency is 60kHz, and the treatment time is 30min;

[0103] (4) Then immerse ...

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Abstract

The invention discloses a surface strengthening treatment method of a neodymium-iron-boron permanent magnet and an application of the surface strengthening treatment method. The surface strengthening treatment method comprises the following steps that the surface of the neodymium-iron-boron permanent magnet is polished and roughened; then the obtained neodymium-iron-boron permanent magnet is placed in an alkaline solution to be subjected to ultrasonic etching treatment; then the obtained neodymium-iron-boron permanent magnet is placed in acetone to be subjected to whole-surface treatment; then the obtained neodymium-iron-boron permanent magnet is placed in deionized water to be subjected to ultrasonic cleaning treatment; and finally, the obtained neodymium-iron-boron permanent magnet is dried. The invention further discloses a preparation method of the neodymium-iron-boron permanent magnet surface coating. According to the method, the surface of the magnet is sequentially strengthened through the technical processes of polishing, roughening, alkaline etching, acetone surface finishing, ultrasonic cleaning and vacuum drying, so that the binding force between the surface of the neodymium-iron-boron permanent magnet and a coating is remarkably enhanced, the temperature and humidity resistance and the neutral salt mist resistance of the coating are improved, and meanwhile, the surface treatment method is simple in process and easy to operate.

Description

technical field [0001] The invention belongs to the technical field of surface modification, and in particular relates to a surface strengthening treatment method of an NdFeB permanent magnet and an application thereof. Background technique [0002] The application value of magnetic materials in daily life and science and technology is getting higher and higher. Due to its excellent magnetic properties, NdFeB permanent magnets have been widely used in voice coil motors, magnetic resonance imaging, generators, sensors, instruments and other fields. However, NdFeB itself has poor corrosion resistance, and magnetic devices must undergo surface modification before use. The traditional methods mainly include electro-galvanizing, hot-dip galvanizing, nickel-copper-nickel electroplating, zinc-based alloy coating, organic coating, phosphating, etc. In recent years, with the country's strict control of environmental and water resource pollution, green and low-energy chromium-free zi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B24B1/00C23C22/60C23F1/40B08B3/12
CPCB24B1/00C23F1/40C23C22/60B08B3/12
Inventor 周巧英陈仁杰郭帅闫阿儒
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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