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Nd-Fe-B magnet material double-layered protecting method employing titanium/zirconium conversion coating and organic coating

An organic coating, NdFeB technology, applied in the direction of metal material coating process, coating, epoxy resin coating, etc., can solve the problems of general anticorrosion performance, harsh, complex processing, etc., to achieve good bonding force, coating The effect of dense, good corrosion resistance

Inactive Publication Date: 2013-08-21
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 the problems of complex and harsh pretreatment and general anti-corrosion performance of some surface protection methods such as electroplating and chemical plating.
Provides a method for double-layer protection of titanium / zirconium conversion film and organic coating on the surface of NdFeB magnet materials. The surface treatment technology of titanium / zirconium conversion film and organic coating double-layer protection 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 neutral salt spray corrosion resistance of the coating is greatly improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 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.

[0025] 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:

[0026] Sodium hydroxide 50g / L; sodium carbonate 25g / L; trisodium phosphate 60g / L; sodium silicate 10g / L; OP-10 emulsifier 3g / L.

[0027] Rust removal solution is made by mixing hydrochloric acid and nitric acid, and the content of each component is as follows:

[0028] Hydrochloric acid 5g / L; nitric acid 15g / L.

[0029] Then, take 15g of fluozirconic acid; 20g of fluotitanic acid; 25g of hydrofluoric acid; 8g of nitric acid; 4g of tan...

Embodiment 2

[0034] 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.

[0035] 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:

[0036] Sodium hydroxide 40g / L; sodium carbonate 20g / L; trisodium phosphate 70g / L; sodium silicate 15g / L; OP-10 emulsifier 5g / L.

[0037] Rust removal solution is made by mixing hydrochloric acid and nitric acid, and the content of each component is as follows:

[0038] Hydrochloric acid 2g / L; nitric acid 20g / L.

[0039] Then, take 17g of fluozirconic acid; 23g of fluotitanic acid; 20g of hydrofluoric acid; 10g of nitric acid; 2g of ta...

Embodiment 3

[0044] 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.

[0045] 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:

[0046]Sodium hydroxide 60g / L; sodium carbonate 30g / L; trisodium phosphate 50g / L; sodium silicate 5g / L; OP-10 emulsifier 2g / L.

[0047] Rust removal solution is made by mixing hydrochloric acid and nitric acid, and the content of each component is as follows:

[0048] Hydrochloric acid 10g / L; nitric acid 10g / L.

[0049] Then, take 20g of fluozirconic acid; 15g of fluotitanic acid; 19g of hydrofluoric acid; 6g of nitric acid; 5g of tann...

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Abstract

The invention relates to a surface protecting technology of an Nd-Fe-B magnet material, and specifically relates to an Nd-Fe-B magnet material surface double-layered protecting method employing a titanium / zirconium conversion coating and an organic coating. First, the Nd-Fe-B magnet material is processed through oil removing, rust removing, and emery paper burnish; then the Nd-Fe-B magnet material is immersed into a diluted titanium / zirconium conversion liquid for 3 to 10min, such that a titanium / zirconium conversion coating is formed; and the material is washed, and is coated with a layer oforganic paint, such that an organic coating is formed. In existing technologies, surface protecting methods such as electroplating chemical plating cause problems of complicated and harsh pre-treatment, and poor corrosion resistance. The method aims at solving the problem. According to the invention, a double-layered protecting surface treatment method employing the titanium / zirconium conversion coating and the organic coating is adopted. The technology is simple, and complicated pre-treatments are not required. With the method, adhesion between the coatings and the substrate is ensured, the magnetic performance is not influenced, and neutral salt mist corrosion resisting capacity of the coatings is greatly improved.

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 titanium / zirconium conversion film and an organic coating for the 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, poo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/34C23C22/82C09D163/00C09D127/12C09D133/00C09D175/04C09D7/12
Inventor 李庆鹏刘建国严川伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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