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Double-layer protection method of water-based inorganic-organic composite coating on the surface of NdFeB magnet material

A technology of water-based inorganic coatings and composite coatings, which is applied in the direction of surface coating liquid devices, coatings, and pre-treated surfaces, etc., can solve problems such as unsatisfactory NdFeB, NdFeB pollution, serious pollution, etc., to achieve Good corrosion resistance, good corrosion resistance, the effect of improving corrosion resistance and wear resistance

Active Publication Date: 2014-10-22
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the current surface protection methods such as electroplating, chemical plating, and composite coating, which are seriously polluted and unable to meet the problems of the application of NdFeB in relatively harsh environments, the purpose of the present invention is to provide a surface water-based inorganic NdFeB magnet material. The method of double-layer protection of organic / organic composite coating adopts the surface treatment technology of double-layer protection of water-based inorganic / organic composite coating, which solves the pollution problem and application limitations of NdFeB protection, and ensures the relationship between the coating and the substrate. Under the premise that the binding force and magnetic properties are not affected, the neutral salt spray corrosion resistance of the coating is greatly improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044]First, prepare the sample, degrease the NdFeB (50mm×50mm×5mm) in an alkaline degreasing solution, then clean it with a large amount of water, then derust it in an acidic derusting solution, wash and dry it with a large amount of water Finally, use 150# sandpaper to polish, then use 600# sandpaper to polish, and then wipe the NdFeB surface clean with alcohol.

[0045] The degreasing liquid is composed of sodium hydroxide, sodium carbonate, trisodium phosphate, sodium silicate, OP-10 emulsifier and water. The content of each component is as follows:

[0046] Sodium hydroxide 10g / L; sodium carbonate 20g / L; trisodium phosphate 50g / L; sodium silicate 5g / L; OP-10 emulsifier 0.2g / L; the rest is water.

[0047] Rust removal solution is made by mixing hydrochloric acid and nitric acid, and the content of each component is as follows:

[0048] Hydrochloric acid 2g / L; nitric acid 80g / L; the rest is water.

[0049] The prepared NdFeB sample is sprayed with a layer of water-based i...

Embodiment 2

[0057] First, prepare the sample, degrease the NdFeB (50mm×50mm×5mm) in an alkaline degreasing solution, then clean it with a large amount of water, then derust it in an acidic derusting solution, wash and dry it with a large amount of water Finally, use 150# sandpaper to polish, then use 600# sandpaper to polish, and then wipe the NdFeB surface clean with alcohol.

[0058] The degreasing liquid is composed of sodium hydroxide, sodium carbonate, trisodium phosphate, sodium silicate, OP-10 emulsifier and water. The content of each component is as follows:

[0059] Sodium hydroxide 12g / L; sodium carbonate 60g / L; trisodium phosphate 70g / L; sodium silicate 10g / L; OP-10 emulsifier 2g / L; the rest is water.

[0060] Rust removal solution is made by mixing hydrochloric acid and nitric acid, and the content of each component is as follows:

[0061] Hydrochloric acid 6g / L; nitric acid 70g / L; the rest is water.

[0062] The prepared NdFeB sample is sprayed with a layer of water-based i...

Embodiment 3

[0070] First, prepare the sample, degrease the NdFeB (50mm×50mm×5mm) in an alkaline degreasing solution, then clean it with a large amount of water, then derust it in an acidic derusting solution, wash and dry it with a large amount of water Finally, use 150# sandpaper to polish, then use 600# sandpaper to polish, and then wipe the NdFeB surface clean with alcohol.

[0071] The degreasing liquid is composed of sodium hydroxide, sodium carbonate, trisodium phosphate, sodium silicate, OP-10 emulsifier and water. The content of each component is as follows:

[0072] Sodium hydroxide 10g / L; sodium carbonate 50g / L; trisodium phosphate 60g / L; sodium silicate 7g / L; OP-10 emulsifier 3g / L; the rest is water.

[0073] Rust removal solution is made by mixing hydrochloric acid and nitric acid, and the content of each component is as follows:

[0074] Hydrochloric acid 8g / L; nitric acid 60g / L; the rest is water.

[0075] The prepared NdFeB sample is sprayed with a layer of water-based in...

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Abstract

The invention relates to the field of surface protection on Nd-Fe-B magnet materials, in particular to a water-based inorganic / organic composite coating double-layer protection method for the surface of an Nd-Fe-B magnet material. The water-based inorganic / organic composite coating double-layer protection method for the surface of the Nd-Fe-B magnet material comprises the steps of firstly, carrying out oil removal, rust removal and sanding on the Nd-Fe-B magnet material, then, coating the Nd-Fe-B magnet material with a water-based inorganic coating material to form an inorganic coating, and finally, coating the Nd-Fe-B magnet material with a water-based organic coating material to form an organic coating. According to the water-based inorganic / organic composite coating double-layer protection method for the surface of the Nd-Fe-B magnet material, in order to solve the problem that in the prior art, some surface protection methods such as the electroplating method, the chemical plating method and the solvent type coating method are complex in pre-processing, strict, serious in pollution, poor in anticorrosion performance and the like, water-based inorganic / organic composite coating double-layer protection is adopted, the problem that pollution is caused by protection of the Nd-Fe-B magnet material is solved, limitation in the aspect of application is removed, and the neutral salt fog corrosion resistance performance of the coatings is improved to a great extent on the premises that binding force between the coatings and a base body is ensured, and magnetic performance is not influenced.

Description

technical field [0001] The invention relates to the field of surface protection of NdFeB magnet materials, in particular to a double-layer protection method of water-based inorganic / organic composite coating on the surface of NdFeB magnet materials. Background technique [0002] Since Masato Sagawa discovered NdFeB magnets in 1983, sintered NdFeB magnets have been widely used in computers, motors, wind power generators, electric vehicles, instruments and meters, magnetic Transmission bearings, high-fidelity loudspeakers, nuclear magnetic resonance imaging instruments, aerospace navigation devices and other industries have huge potential application prospects in emerging technology fields such as maglev trains. Relying on the advantages of rare earth resources and production costs, China has vigorously developed the NdFeB magnet industry and has become the world's largest producer and consumer. [0003] However, due to the strong chemical activity of Nd-Fe-B material, poor c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B05D7/00B05D3/12C09D1/00C09D163/00C09D133/00C09D127/12C09D175/04C09D7/12
Inventor 李庆鹏管勇赵丽娜赵焕刘建国严川伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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