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Blackening layer and organic coating dual-protective method of neodymium iron boron magnetic material surface

An organic coating, surface blackening technology, applied in metal material coating process, chemical instruments and methods, layered products, etc., can solve the problems of harshness, complex pretreatment, general corrosion resistance, etc., and achieve good corrosion resistance. Effect

Inactive Publication Date: 2013-03-13
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] In view of the complicated and harsh pre-treatment of some surface protection methods such as electroplating and chemical plating, and the general anti-corrosion performance, the purpose of the present invention is to provide a double-layer protective layer of blackened surface treatment layer and organic coating for NdFeB magnet materials. The method adopts the surface treatment technology of blackening treatment layer and organic coating double-layer protection, which solves the more complicated pre-treatment, and under the premise that the bonding force between the coating and the substrate and the magnetic properties are not affected, the larger Improve the neutral salt spray corrosion resistance of the coating to a certain extent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 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 derusting 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.

[0024] 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:

[0025] Sodium hydroxide 50g / L; sodium carbonate 25g / L; trisodium phosphate 60g / L; sodium silicate 10g / L; OP-10 emulsifier 3g / L; the balance is water.

[0026] Rust removal solution is made by mixing hydrochloric acid and nitric acid, and the content of each component is as follows:

[0027] Hydrochloric acid 5g / L; nitric acid 15g / L; the balance is water.

[0028] Then, take 3g of selenous acid; 5g of copper sulfate; 2g of nickel nitra...

Embodiment 2

[0033] 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.

[0034] 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:

[0035] Sodium hydroxide 40g / L; sodium carbonate 20g / L; trisodium phosphate 70g / L; sodium silicate 15g / L; OP-10 emulsifier 5g / L; the balance is water.

[0036] Rust removal solution is made by mixing hydrochloric acid and nitric acid, and the content of each component is as follows:

[0037] Hydrochloric acid 2g / L; nitric acid 20g / L; the balance is water.

[0038] Then, take 5g of selenous acid; 2g of copper sulfate; 6g of nickel nitra...

Embodiment 3

[0043]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 derusting 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.

[0044] 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:

[0045] Sodium hydroxide 60g / L; sodium carbonate 30g / L; trisodium phosphate 50g / L; sodium silicate 5g / L; OP-10 emulsifier 2g / L; the balance is water.

[0046] Rust removal solution is made by mixing hydrochloric acid and nitric acid, and the content of each component is as follows:

[0047] Hydrochloric acid 10g / L; nitric acid 10g / L; the balance is water.

[0048] Then, take 4g of selenous acid; 6g of copper sulfate; 3g of nickel nitrat...

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Abstract

The invention relates to a surface protective technology of a neodymium iron boron magnetic material, and particularly relates to a blackening layer and organic coating dual-protective method of a neodymium iron boron magnetic material surface. The blackening layer and organic coating dual-protective method comprises the following steps: firstly removing oil and rust from neodymium iron boron, and polishing the neodymium iron boron by adhesive paper; then soaking the neodymium iron boron in a blackening liquor for 8-15min to generate a layer of oxide film; and coating a layer of organic coating after washing and airing, and curing to form an organic coating. The blackening layer and organic coating dual-protective method aims at the problems of complex and harsh pre-processing, general anti-corrosion performance and the like existing in certain traditional surface protective methods such as electroplating and chemical plating. The blackening layer and organic coating dual-protective surface treatment technology has the advantages that the technology is simple, the complex pre-processing is omitted, and the neutral salt mist corrosion resistance performance of the coating is increased to a greater degree under the condition that the binding force of the coating and a matrix is ensured and the magnetic property is not affected.

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 a blackened treatment layer and an organic coating layer 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 mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/17B32B27/06
Inventor 李庆鹏管勇刘建国严川伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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