Nickel plating/organic coating double-layer surface protection method for NdFeB (neodymium-iron-boron) magnet material

An organic coating, neodymium iron boron technology, applied in the device, coating, epoxy resin coating and other directions of coating liquid on the surface, can solve the problem of inability to meet the application of neodymium iron boron, and achieve a complete supporting system, medium resistance The effect of good salt spray and good corrosion resistance

Active Publication Date: 2012-07-04
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 address some surface protection methods such as electroplating, electroless plating, and composite coating, which cannot meet the application of NdFeB in relatively harsh environments.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 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 , use 150# sandpaper to polish, then use 600# sandpaper to polish, and then wipe the NdFeB surface clean with alcohol.

[0027] 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:

[0028] 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.

[0029] Rust removal solution is made by mixing hydrochloric acid and nitric acid, and the content of each component is as follows:

[0030] Hydrochloric acid 2g / L; nitric acid 80g / L; the rest is water.

[0031] Then, activate NdFeB for 40 seconds (the activation solution is uniformly mix...

Embodiment 2

[0037] 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 , use 150# sandpaper to polish, then use 600# sandpaper to polish, and then wipe the NdFeB surface clean with alcohol.

[0038] 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:

[0039] 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.

[0040] Rust removal solution is made by mixing hydrochloric acid and nitric acid, and the content of each component is as follows:

[0041] Hydrochloric acid 6g / L; nitric acid 70g / L; the rest is water.

[0042] Then, activate the NdFeB for 40 seconds (the activation solution is uniformly ...

Embodiment 3

[0048]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 , use 150# sandpaper to polish, then use 600# sandpaper to polish, and then wipe the NdFeB surface clean with alcohol.

[0049] 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:

[0050] 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.

[0051] Rust removal solution is made by mixing hydrochloric acid and nitric acid, and the content of each component is as follows:

[0052] Hydrochloric acid 8g / L; nitric acid 60g / L; the rest is water.

[0053] Then, activate NdFeB for 40 seconds (the activation solution is uniformly mixed ...

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Abstract

The invention relates to a surface protection technology for a NdFeB (neodymium-iron-boron) magnet material, in particular to a nickel plating / organic coating double-layer surface protection method for the NdFeB magnet material. The nickel plating / organic coating double-layer surface protection method comprises the following steps of: firstly removing oil and rust from NdFeB, and polishing by using sand paper; then carrying out nickel plating process on the NdFeB; and coating a layer of organic paint so as to form an organic coating. According to the nickel plating / organic coating double-layer surface protection method, disclosed by the invention, aiming at the problem of poor corrosion resistance of some single-layer surface protections, such as electric plating, chemical plating and organic coating, a surface protection technology of nickel plating / organic coating double-layer protection is adopted, so that the application restriction of the NdFeB is eliminated, and the neutral salt spray corrosion resistance of a coating is improved greatly on the premise of ensuring the adhesion force and magnetic property of the coating and a substrate to be unaffected.

Description

technical field [0001] The invention relates to a surface protection technology of an NdFeB magnet material, in particular to a double-layer protection method of nickel plating / organic coating on the surface of an NdFeB magnet material. 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 resi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/12C25D5/48B05D7/24C09D163/00C09D133/00C09D127/12C09D175/04C09D7/12
Inventor 李庆鹏刘建国严川伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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