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Coating method for neodymium iron boron magnet electrophoresis film and coated neodymium iron boron magnet

A coating method, NdFeB technology, applied in the direction of electrolytic coating, electrophoretic plating, magnetic objects, etc., can solve the problems of poor bonding force, difficulty, high energy consumption, etc.

Active Publication Date: 2017-01-04
京磁材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the coating method of NdFeB magnet electrophoretic film in the prior art still has the problem of poor binding force, especially it cannot meet the requirements of higher binding force required by permanent magnets for motors, and has high energy consumption in actual production. , containing heavy metal ions, serious pollution and difficult wastewater treatment and other inherent defects

Method used

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  • Coating method for neodymium iron boron magnet electrophoresis film and coated neodymium iron boron magnet
  • Coating method for neodymium iron boron magnet electrophoresis film and coated neodymium iron boron magnet
  • Coating method for neodymium iron boron magnet electrophoresis film and coated neodymium iron boron magnet

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] NdFeB magnet sample specification: R24×r43.8×L24×W30.69

[0068] The NdFeB magnets that have been degreased, washed with water, pickled or ultrasonically washed in sequence are subjected to silane pretreatment, and then washed with water to obtain a magnet compounded with a silane film.

[0069] Among them, the pickling is pickling with nitric acid, and about 20 μm is washed off on one side in the thickness direction.

[0070] Silane pretreatment: In silane solution, a silane conversion film is formed on the surface of the pretreated NdFeB magnet. Silane treatment conditions: temperature: 23°C, time: 90 seconds;

[0071] Then, electrophoretic coating is performed on the magnet compounded with the silane film obtained in the above steps, and then solidified to obtain a coated NdFeB magnet.

[0072] For washing conditions, see Table 1. Table 1 is a comparison between the washing process of the coating method provided by the present invention and the washing process of t...

Embodiment 2

[0086] NdFeB magnet sample specification: R24×r43.8×L24×W30.69

[0087] The NdFeB magnets that have been degreased, washed with water, pickled or ultrasonically washed in sequence are subjected to silane pretreatment, and then washed with water to obtain a magnet compounded with a silane film.

[0088] Among them, the pickling is pickling with nitric acid, and about 20 μm is washed off on one side in the thickness direction.

[0089] Silane pretreatment: In silane solution, a silane conversion film is formed on the surface of the pretreated NdFeB magnet. Silane treatment conditions: temperature: 23°C, time: 90 seconds;

[0090] Then, electrophoretic coating is performed on the magnet compounded with the silane film obtained in the above steps, and then solidified to obtain a coated NdFeB magnet.

[0091] For washing conditions, see Table 1. Table 1 is a comparison between the washing process of the coating method provided by the present invention and the washing process of t...

Embodiment 3

[0106] NdFeB magnet sample specification: 55*28*1.5

[0107] The NdFeB magnets that have been degreased, washed with water, pickled or ultrasonically washed in sequence are subjected to silane pretreatment, and then washed with water to obtain a magnet compounded with a silane film.

[0108] Among them, the pickling is pickling with nitric acid, and about 20 μm is washed off on one side in the thickness direction.

[0109] Silane pretreatment: In silane solution, a silane conversion film is formed on the surface of the pretreated NdFeB magnet. Silane treatment conditions: temperature: 23°C, time: 90 seconds;

[0110] Then, electrophoretic coating is performed on the magnet compounded with the silane film obtained in the above steps, and then solidified to obtain a coated NdFeB magnet.

[0111] For washing conditions, see Table 1. Table 1 is a comparison between the washing process of the coating method provided by the present invention and the washing process of the original...

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Abstract

The invention provides a coating method for a neodymium iron boron magnet electrophoresis film. The coating method includes the following steps that after a neodymium iron boron magnet obtained after pretreatment is subjected to silane pretreatment, a magnet on which a silane film is compounded is obtained through washing; and the obtained magnet on which the silane film is compounded in the above step is subjected to electrophoresis coating, and the coated neodymium iron boron magnet is obtained. According to the coating method, based on the specific property of the neodymium iron boron magnet, a traditional pretreatment technology is replaced with silane pretreatment, a molecule bridge can be erected between the neodymium iron boron magnet and an interface of organic matter through silane molecules, the two kinds of materials completely different in property are connected together, the bonding force between the magnet and the subsequent electrophoresis film is improved, corrosion resistance of the coated neodymium iron boron magnet can be improved as well, and the production process is more environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of magnet preparation, and in particular relates to a method for coating an electrophoretic film of an NdFeB magnet and a coated NdFeB magnet. Background technique [0002] Permanent magnets are hard magnets, magnets that can maintain their magnetism for a long time, and are not easy to lose their magnetization or be magnetized. Therefore, whether in industrial production or in daily life, hard magnets are one of the most commonly used strong materials. Hard magnets can be divided into natural magnets and artificial magnets. Artificial magnets mean that by synthesizing alloys of different materials, the same effect as natural magnets (magnets) can be achieved, and the magnetic force can also be improved. With the emergence of rare earth permanent magnets in the 1960s, it opened up a new era for the application of magnets. The first generation of samarium cobalt permanent magnets SmCo 5 , the second generat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D13/20C22C30/00C22C30/02C22C38/12C22C38/06C22C38/32C22C38/16C22C38/10C22C38/14H01F1/057
CPCC22C30/00C22C30/02C22C38/002C22C38/005C22C38/06C22C38/10C22C38/12C22C38/14C22C38/16C22C38/32C25D13/20H01F1/0572
Inventor 林萌微
Owner 京磁材料科技股份有限公司
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