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NdFeB magnet material aqueous environment-friendly thin coating composite protection method

A technology of NdFeB and thin coating, which is applied in the direction of coating, permanent magnet manufacturing, and devices for coating liquid on the surface, etc. It can solve the problems of failing to meet environmental protection requirements, NdFeB pollution protection, etc., and achieve excellent sealing performance , no heavy metal pollution, excellent film-forming and sealing effect

Inactive Publication Date: 2019-08-30
江苏赛清科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For some surface protection methods such as electroplating, electroless plating, and composite coating, the application in the field of NdFeB protection cannot be satisfied. Either the pollution is serious and the environmental protection requirements cannot be met, or the coating is too thick to meet the tolerance requirements. The purpose of the invention is to provide a water-based environmentally friendly thin coating composite protection method for NdFeB magnet materials. The water-based environmentally friendly thin coating composite protection system can ensure the bonding force between the coating and the substrate and the coating’s resistance to corrosion. Under the premise of non-toxic salt spray corrosion performance, it solves the pollution problem and application limitation of NdFeB protection

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] First, prepare the sample, degrease the NdFeB (20mm×10mm×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 for 3-10 minutes, then use 600# sandpaper to polish for 5-20 minutes, and then wipe the NdFeB surface with alcohol.

[0026] 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:

[0027] Sodium hydroxide 11g / L; sodium carbonate 30g / L; trisodium phosphate 60g / L; sodium silicate 7g / L; OP-10 emulsifier 0.5g / L; the rest is water.

[0028] Rust removal solution is made by mixing hydrochloric acid and nitric acid, and the content of each component is as follows:

[0029] Hydrochloric acid 8g / L; nitric acid 70g / L; the rest is water.

[0030] Use a spray gun with a diameter of 0....

Embodiment 2

[0037]First, prepare the sample, degrease the NdFeB (20mm×10mm×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 120-mesh corundum for sandblasting, and then wipe the surface of the NdFeB with alcohol.

[0038] 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: sodium hydroxide 11g / L; sodium carbonate 30g / L; Trisodium phosphate 60g / L; sodium silicate 7g / L; OP-10 emulsifier 0.5g / L; the rest is water.

[0039] Rust removal solution is made by mixing hydrochloric acid and nitric acid, and the content of each component is as follows:

[0040] Hydrochloric acid 8g / L; nitric acid 70g / L; the rest is water.

[0041] The prepared NdFeB sample is sprayed with a layer of water-based environmental protection primer. B...

Embodiment 3

[0049] First, prepare the sample, degrease the NdFeB (20mm×10mm×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 120-mesh corundum for sandblasting, and then wipe the surface of the NdFeB with alcohol.

[0050] 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: sodium hydroxide 15g / L; sodium carbonate 40g / L; Trisodium phosphate 50g / L; sodium silicate 10g / L; OP-10 emulsifier 0.8g / L; the rest is water.

[0051] The derusting solution is made by mixing hydrochloric acid and nitric acid, and the content of each component is as follows: hydrochloric acid 5g / L; nitric acid 75g / L; the rest is water.

[0052] The prepared NdFeB sample is sprayed with a layer of water-based environmental protection primer coating. ...

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PUM

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Abstract

The invention relates to the field of aqueous environment-friendly protection of NdFeB magnet materials, in particular to an NdFeB magnet material aqueous environment-friendly thin coating composite protection method comprising the steps of firstly, de-oiling, de-rusting, sandblasting or sanding the NdFeB; then, applying a layer of aqueous environment-friendly bottom coating to the NdFeB; and after curing, applying a layer of aqueous environment-friendly closing top coating to form a thin coating composite system. In view of the complex and harsh pretreatment, serious pollution, thick coatingand poor corrosion resistance of some surface protection methods such as electroplating, electroless plating, solvent-based coating and the like, the method uses a aqueous environment-friendly thin coating composite protection system, and solves the pollution and application limitations of the NdFeB protection under the premise of ensuring the bonding strength between the coating and a substrate and the neutral salt spray corrosion resistance of the coating.

Description

technical field [0001] The invention relates to the field of water-based environmental protection protection of NdFeB magnet materials, in particular to a method for water-based environmental protection thin coating composite protection 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 ma...

Claims

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Application Information

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IPC IPC(8): H01F41/02C09D1/00C09D5/10C09D133/04C09D163/00C09D175/04C09D1/04B05D7/00B05D3/12B05D3/10C23G1/08
CPCB05D3/10B05D3/12B05D7/546B05D2401/20C09D1/00C09D1/04C09D5/103C09D5/106C09D133/04C09D143/04C09D163/00C09D175/04C23G1/085H01F41/026C08K3/34C08K3/36
Inventor 李庆鹏彭辉
Owner 江苏赛清科技有限公司