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Zinc plated/organic coating double-layer protection method for surface of neodymium-iron-boron magnet material

An organic coating, NdFeB technology, applied in the direction of metal material coating process, coating, superimposed layer plating, etc., can solve the problems that cannot meet the application of NdFeB, and achieve a complete supporting system and dense coating , good resistance to neutral salt spray

Inactive Publication Date: 2014-05-07
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 the NdFeB for 40 seconds (the activation solution is uniformly...

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 NdFeB for 40 seconds (the activation solution is uniformly mixe...

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 of a neodymium-iron-boron magnet material, in particular to a zinc plated / organic coating double-layer protection method for the surface of a neodymium-iron-boron magnet material. The double-layer protection method comprises the following steps of: firstly, removing oil and rust on the neodymium-iron-boron and sanding the neodymium-iron-boron; secondly, carrying on zinc plating treatment on the neodymium-iron-boron; and finally, coating a layer of organic paint to form an organic coating. Aiming at problems of poor corrosion prevention property in a traditional single-layer surface protection, such as an electric-plated layer, a chemical-plated layer, the organic coating and the like, a surface treatment technology of the double-layer protection of the zinc plated / organic coating layer is used for solving limitation on the application of the neodymium-iron-boron; furthermore, on the premise that the bonding force and the magnetic properties of the coating and a base body are not influenced, the property of resisting corrosion of neutral salt fog of the coating is greatly improved.

Description

technical field [0001] The invention relates to a surface protection technology of an NdFeB magnet material, in particular to a method for double-layer protection of the surface of an NdFeB magnet material by galvanizing / organic coating. 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 res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C28/00H01F41/00
Inventor 李庆鹏刘建国严川伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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