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Neodymium iron boron magnet material phosphating treatment and organic coating double layers protection method

A technology of organic coating and phosphating treatment, applied in metal material coating process, coating, device for coating liquid on the surface, etc. The effect of compactness, good binding force and good anti-corrosion ability

Inactive Publication Date: 2012-10-17
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

[0005] The purpose of the present invention is to provide a kind of NdFeB magnet material surface phosphating treatment and organic coating double-layer protection for the problems of complex and harsh pre-treatment and general anti-corrosion performance of some surface protection methods such as electroplating and chemical plating. The method adopts the surface treatment technology of phosphating treatment and organic coating double-layer protection, which solves the more complicated pre-treatment, and under the premise of ensuring that the bonding force between the coating and the substrate and the magnetic properties are not affected, the Improve the neutral salt spray corrosion resistance of the coating

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] First, prepare the sample, degrease the NdFeB (50mm×50mm×5mm) in an alkaline degreasing solution, then wash it with a large amount of water, then derust it in an acidic descaling solution, wash and dry it with a large amount of water , wipe the NdFeB surface clean with alcohol.

[0023] The degreasing liquid is composed of sodium hydroxide, sodium carbonate, trisodium phosphate, sodium silicate, and OP-10 emulsifier. The contents of each component are as follows:

[0024] Sodium hydroxide 45g / L; sodium carbonate 25g / L; trisodium phosphate 60g / L; sodium silicate 10g / L; OP-10 emulsifier 3g / L; the rest is water.

[0025] Rust removal solution is made by mixing hydrochloric acid and nitric acid, and the content of each component is as follows:

[0026] Hydrochloric acid 12g / L; nitric acid 15g / L; the rest is water.

[0027] Then, take sodium dihydrogen phosphate 15g; phosphoric acid 35g; sodium nitrate 5g; tartaric acid 3g; sodium fluoride 0.5g; copper nitrate 0.08g; ammon...

Embodiment 2

[0032] First, prepare the sample, degrease the NdFeB (50mm×50mm×5mm) in an alkaline degreasing solution, then wash it with a large amount of water, then derust it in an acidic descaling solution, wash and dry it with a large amount of water , wipe the NdFeB surface clean with alcohol.

[0033] The degreasing liquid is composed of sodium hydroxide, sodium carbonate, trisodium phosphate, sodium silicate, and OP-10 emulsifier. The contents of each component are as follows:

[0034] Sodium hydroxide 60g / L; sodium carbonate 20g / L; trisodium phosphate 70g / L; sodium silicate 5g / L; OP-10 emulsifier 2g / L; the rest is water.

[0035] Rust removal solution is made by mixing hydrochloric acid and nitric acid, and the content of each component is as follows:

[0036] Hydrochloric acid 8g / L; nitric acid 17g / L; the rest is water.

[0037] Then, take 18g of sodium dihydrogen phosphate; 30g of phosphoric acid; 7g of sodium nitrate; 5g of tartaric acid; 1g of sodium fluoride; 1g of copper nit...

Embodiment 3

[0042] First, prepare the sample, degrease the NdFeB (50mm×50mm×5mm) in an alkaline degreasing solution, then wash it with a large amount of water, then derust it in an acidic descaling solution, wash and dry it with a large amount of water , and then wipe the NdFeB surface clean with alcohol.

[0043] The degreasing liquid is composed of sodium hydroxide, sodium carbonate, trisodium phosphate, sodium silicate, and OP-10 emulsifier. The contents of each component are as follows:

[0044] Sodium hydroxide 50g / L; sodium carbonate 25g / L; trisodium phosphate 55g / L; sodium silicate 10g / L; OP-10 emulsifier 5g / L; the rest is water.

[0045] Rust removal solution is made by mixing hydrochloric acid and nitric acid, and the content of each component is as follows:

[0046] Hydrochloric acid 10g / L; nitric acid 15g / L; the rest is water.

[0047]Then, take sodium dihydrogen phosphate 20g; phosphoric acid 35g; sodium nitrate 10g; tartaric acid 4g; sodium fluoride 2g; copper nitrate 1g; a...

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Abstract

The invention relates to a surface protection technology of a neodymium iron boron magnet material, concretely relates to a neodymium iron boron magnet material surface phosphating treatment and an organic coating double layers protection method. The method comprises the following steps: removing oil on neodymium iron boron, removing rust, and then immersing neodymium iron boron in a phosphating liquid for 5-15 minutes to generate a layer of phosphating coat, washing and drying, and then coating a layer of organic paint to form an organic coating. The method of the invention aims at the problems of complex, rigorous pre-treatment and poor anti-corrosive property in a surface protection method during electroplating and chemical plating. According to the invention, the surface treatment technology of phosphatization treatment and organic coating double layers protection can be used, the technology is simple without complex pre-treatment, under the prerequisite that the combination force of the coating and the matrix and the magnetic property are not be influenced, the neutral salt spray corrosion resistant performance of the coating can be largely enhanced.

Description

technical field [0001] The invention relates to the surface protection technology of NdFeB magnet materials, in particular to a double-layer protection method of phosphating treatment and organic coating 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 corrosion resistance...

Claims

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Application Information

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IPC IPC(8): C23C22/44B05D7/26
Inventor 李庆鹏刘建国严川伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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