CN103805993A - Permanent magnetic material surface treatment method - Google Patents
Permanent magnetic material surface treatment method Download PDFInfo
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- CN103805993A CN103805993A CN201210446100.8A CN201210446100A CN103805993A CN 103805993 A CN103805993 A CN 103805993A CN 201210446100 A CN201210446100 A CN 201210446100A CN 103805993 A CN103805993 A CN 103805993A
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- surface treatment
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Abstract
The invention provides a permanent magnetic material surface treatment method, the surface treatment method comprises the following steps: (1) chamfer polishing, to be more specific, using a mechanical vibration grinding and chamfer barreling method for conventional polishing of a neodymium iron boron permanent magnetic material; (2) degreasing and oil cleaning, to be more specific, adding sodium phosphate, sodium carbonate or sodium hydroxide for conventional degreasing and oil cleaning; (3) acid pickling for rust cleaning, to be more specific, adding a nitric acid solution for conventional acid pickling for rust cleaning, and then washing with water; (4) conventional phosphating treatment and water washing; and (5) chemical vapor deposition for film forming. Through the method of the invention, a film, which is uniform in surface, high in corrosion resistance, and capable of effectively reducing roughness of the material, can be formed, and the film can prevent further corrosion of various harmful gases on the permanent magnetic material.
Description
Technical field
The present invention relates to the field of surface treatment of material, especially relate to the surface treatment method of Nd-Fe-Bo permanent magnet material, specifically, the present invention relates to a kind of Nd-Fe-B permanent magnet electroless plating protective membrane.
Background technology
In recent years, the application and development of neodymium iron boron (NdFeB) permanent magnet material is very rapid, and the protection success or not of Nd-Fe-Bo permanent magnet material is related to one of gordian technique that can material apply.This material is to be mainly prepared from by powder metallurgical technique by elements such as rare earth metal neodymium Nd, iron and boron.As the strongest current magneticsubstance, be widely used in all fields such as electroplating device, machinery, medical treatment, automobile, application prospect is very wide.
The prerequisite of Nd-Fe-Bo permanent magnet material application is first to resolve the Anticorrosion of Nd-Fe-Bo permanent magnet material.The porous material being prepared from as a kind of powder metallurgical technique, because of rich neodymium phase wherein, neodymium iron boron principal phase and borderline phase are easy to form intergranular corrosion.Rear earth element nd in neodymium iron boron powder alloy, character is active, make the corrosion resisting property of whole Nd-Fe-B alloys become very poor, very easily corrosion in damp and hot environment, because corrosion failure causes decline or the damage of magnetic property, have a strong impact on the work-ing life of Nd-Fe-B permanent magnet, reduced stability and the reliability of product.The magnetic property of Nd-Fe-Bo permanent magnet material and its weave construction have very large relation.The principal phase of Nd-Fe-B permanent magnet is the main source of magnet magnetic property.To coercive force contribution maximum is rich neodymium phase.To there is huge variation in the magnetic property of material after corrosion occurs Nd-Fe-Bo permanent magnet material.Therefore, the Anticorrosion of Nd-Fe-Bo permanent magnet material is the subject matter that Nd-Fe-Bo permanent magnet material need to solve always.
The anti-corrosion method of Nd-Fe-Bo permanent magnet material has much at present.Wherein there are electronickelling, electro-galvanizing (CN1421547A, CN1056133A), shooting of multi-layer nickel electroplating, copper facing (CN1514889A), the several different methods such as phosphatization (200510020633X), electrocoating paint.
Summary of the invention
The object of this invention is to provide a kind of surface treatment method of permanent magnet material, improve the antiseptic property of permanent magnet material.Surface treatment method of the present invention comprises the steps:
(1) chamfering polishing: adopt mechanical vibration, barreling chamfering method to carry out routine polishing to Nd-Fe-Bo permanent magnet material; (2) degreasing degreasing: add sodium phosphate, sodium carbonate or sodium hydroxide to carry out conventional degreasing degreasing; (3) rust cleaning: add again salpeter solution to carry out conventional acid pickling and rust removing, washing; (4) traditional phosphating solutions processing, washing; (5) carry out chemical vapor deposition film forming.
Preferably, adopt parylene film to carry out chemical vapor deposition film forming.
Preferably, the type of described parylene film is N-type, C type, D type or HT type.
Preferably, the thickness of described parylene film is 5 ~ 30 microns.
Preferably, described acid pickling and rust removing is derusting by sandblast or acid pickling and rust removing.
Preferably, described permanent magnet material is sintered Nd-Fe-B permanent magnetic material or binding Nd-Fe-B permanent magnetic material.
The film that is formed that layer of surface is even, solidity to corrosion is high and can be effectively reduced the roughness of material by surface treatment method of the present invention can stop the further corrosion of various obnoxious flavoures to permanent magnet material.
Embodiment
Further illustrate technical scheme of the present invention and technique effect below in conjunction with embodiment, but these embodiment unrestricted embodiments of the present invention, the present invention has numerous embodiments, have more than and be limited to content described in this specification sheets, those skilled in the art is under the present application mental condition, and the scheme completing should be within the scope of the present invention.
Embodiment 1
Will
2.3 kilograms of elder generations of sintered Nd-Fe-B permanent magnetic material in vibrating ball mill, polish 2 hours.Through sodium phosphate 20g/ liter, sodium carbonate 10g/ liter, sodium hydroxide 10g/ rises after degreasing degreasing, in 1% nitric acid, oxide on surface is removed in pickling, washing, traditional phosphating solutions processing (details are shown in preparation and the development of anticorrosive performance of the 2008-6 such as Li Qing " China rare earth journal " sintered type NdFeB permanent magnetic material surface phosphatize phosphate coat), washing, dries up.Adopt N-type parylene film, parylene film is put into evaporation boat, close evaporator room, Nd-Fe-B permanent magnet is put into sediment chamber, vacuumize, when vacuum tightness is evacuated to below 20Pa, open pyrolyzer, control 690 ℃ of pyrolyzer temperature, parylene film gas is cracked into monomer, and enter sediment chamber, under cold-trap effect, be deposited on surface of Nd-Fe-B permanent magnet, chemical vapor deposition 5 minutes.5 microns of thickness, coating binding force is good, and cross cut test is qualified, and Corrosion Protection is referring to table 1.
Embodiment 2
Will
2.3 kilograms of elder generations of sintered Nd-Fe-B permanent magnetic material in vibrating ball mill, polish 2 hours.Through sodium phosphate 20g/ liter, sodium carbonate 10g/ liter, sodium hydroxide 10g/ rises after degreasing degreasing, in 1% nitric acid, oxide on surface is removed in pickling, washing, traditional phosphating solutions processing (details are shown in preparation and the development of anticorrosive performance of the 2008-6 such as Li Qing " China rare earth journal " sintered type NdFeB permanent magnetic material surface phosphatize phosphate coat), washing, dries up.Adopt C type parylene film, parylene film is put into evaporation boat, close evaporator room, Nd-Fe-B permanent magnet is put into sediment chamber, vacuumize, when vacuum tightness is evacuated to below 20Pa, open pyrolyzer, control 690 ℃ of pyrolyzer temperature, parylene film gas is cracked into monomer, and enter sediment chamber, under cold-trap effect, be deposited on surface of Nd-Fe-B permanent magnet, chemical vapor deposition 30 minutes.30 microns of thickness, coating binding force is good, and cross cut test is qualified, and Corrosion Protection is referring to table 1.
Embodiment 3
Will
2.3 kilograms of elder generations of binding Nd-Fe-B permanent magnetic material in vibrating ball mill, polish 2 hours.Through sodium phosphate 20g/ liter, sodium carbonate 10g/ liter, sodium hydroxide 10g/ rises after degreasing degreasing, in 1% nitric acid, oxide on surface is removed in pickling, washing, traditional phosphating solutions processing (details are shown in preparation and the development of anticorrosive performance of the 2008-6 such as Li Qing " China rare earth journal " sintered type NdFeB permanent magnetic material surface phosphatize phosphate coat), washing, dries up.Adopt D type parylene film, parylene film is put into evaporation boat, close evaporator room, Nd-Fe-B permanent magnet is put into sediment chamber, vacuumize, when vacuum tightness is evacuated to below 20Pa, open pyrolyzer, control 690 ℃ of pyrolyzer temperature, parylene film gas is cracked into monomer, and enter sediment chamber, under cold-trap effect, be deposited on surface of Nd-Fe-B permanent magnet, chemical vapor deposition 30 minutes.10 microns of thickness, coating binding force is good, and cross cut test is qualified, and Corrosion Protection is referring to table 1.
Embodiment 4
Will
2.3 kilograms of elder generations of sintered Nd-Fe-B permanent magnetic material in vibrating ball mill, polish 2 hours.Through sodium phosphate 20g/ liter, sodium carbonate 10g/ liter, sodium hydroxide 10g/ rises after degreasing degreasing, in 1% nitric acid, oxide on surface is removed in pickling, washing, traditional phosphating solutions processing (details are shown in preparation and the development of anticorrosive performance of the 2008-6 such as Li Qing " China rare earth journal " sintered type NdFeB permanent magnetic material surface phosphatize phosphate coat), washing, dries up.Adopt HT type parylene film, parylene film is put into evaporation boat, close evaporator room, Nd-Fe-B permanent magnet is put into sediment chamber, vacuumize, when vacuum tightness is evacuated to below 20Pa, open pyrolyzer, control 690 ℃ of pyrolyzer temperature, parylene film gas is cracked into monomer, and enter sediment chamber, under cold-trap effect, be deposited on surface of Nd-Fe-B permanent magnet, chemical vapor deposition 25 minutes.25 microns of thickness, coating binding force is good, and cross cut test is qualified, and Corrosion Protection is referring to table 1.
Embodiment 5
Will
2.3 kilograms of elder generations of sintered Nd-Fe-B permanent magnetic material in vibrating ball mill, polish 2 hours.Through sodium phosphate 20g/ liter, sodium carbonate 10g/ liter, sodium hydroxide 10g/ rises after degreasing degreasing, in 1% nitric acid, oxide on surface is removed in pickling, washing, traditional phosphating solutions processing (details are shown in preparation and the development of anticorrosive performance of the 2008-6 such as Li Qing " China rare earth journal " sintered type NdFeB permanent magnetic material surface phosphatize phosphate coat), washing, dries up.Adopt C type parylene film, parylene film is put into evaporation boat, close evaporator room, Nd-Fe-B permanent magnet is put into sediment chamber, vacuumize, when vacuum tightness is evacuated to below 20Pa, open pyrolyzer, control 690 ℃ of pyrolyzer temperature, parylene film gas is cracked into monomer, and enter sediment chamber, under cold-trap effect, be deposited on surface of Nd-Fe-B permanent magnet, chemical vapor deposition 30 minutes.20 microns of thickness, coating binding force is good, and cross cut test is qualified, and Corrosion Protection is referring to table 1.
Embodiment 6
Will
2.3 kilograms of elder generations of sintered Nd-Fe-B permanent magnetic material in vibrating ball mill, polish 2 hours.Through sodium phosphate 20g/ liter, sodium carbonate 10g/ liter, sodium hydroxide 10g/ rises after degreasing degreasing, in 1% nitric acid, oxide on surface is removed in pickling, washing, traditional phosphating solutions processing (details are shown in preparation and the development of anticorrosive performance of the 2008-6 such as Li Qing " China rare earth journal " sintered type NdFeB permanent magnetic material surface phosphatize phosphate coat), washing, dries up.Adopt C type parylene film, parylene film is put into evaporation boat, close evaporator room, Nd-Fe-B permanent magnet is put into sediment chamber, vacuumize, when vacuum tightness is evacuated to below 20Pa, open pyrolyzer, control 690 ℃ of pyrolyzer temperature, parylene film gas is cracked into monomer, and enter sediment chamber, under cold-trap effect, be deposited on surface of Nd-Fe-B permanent magnet, chemical vapor deposition 30 minutes.25 microns of thickness, coating binding force is good, and cross cut test is qualified, and Corrosion Protection is referring to table 1.
Below, the experimental data of physical parameter is carried out in table 1 explanation by the coating that above-described embodiment 1 ~ 6 is obtained.
Table 1
| No. embodiment | Salt fog (hour) | Damp and hot (hour) |
| Embodiment 1 | 24 | 100 |
| Embodiment 2 | 48 | 100 |
| Embodiment 3 | 36 | 100 |
| Embodiment 4 | 36 | 100 |
| Embodiment 5 | 48 | 100 |
| Embodiment 6 | 48 | 100 |
As can be seen from Table 1, the coatingsurface obtaining by surface treatment method of the present invention is even, and solidity to corrosion is high.
It should be noted that, foregoing invention content and embodiment are intended to prove the practical application of technical scheme provided by the present invention, should not be construed as limiting the scope of the present invention.Those skilled in the art are in spirit of the present invention and principle, when doing various modifications, be equal to and replace or improve.Protection scope of the present invention is as the criterion with appended claims.
Claims (7)
1. a surface treatment method for permanent magnet material, described surface treatment method comprises the steps:
(1) chamfering polishing: adopt mechanical vibration, barreling chamfering method to carry out routine polishing to Nd-Fe-Bo permanent magnet material;
(2) degreasing degreasing: add sodium phosphate, sodium carbonate or sodium hydroxide to carry out conventional degreasing degreasing;
(3) rust cleaning: add again salpeter solution to carry out conventional acid pickling and rust removing, washing;
(4) traditional phosphating solutions processing, washing; With
(5) carry out chemical vapor deposition film forming.
2. surface treatment method as claimed in claim 1, adopts parylene film to carry out chemical vapor deposition film forming.
3. surface treatment method as claimed in claim 2, the type of described parylene film is N-type, C type, D type or HT type.
4. surface treatment method as claimed in claim 1, described chemical vapor deposition film forming is that parylene film is put into evaporation boat, close evaporator room, Nd-Fe-B permanent magnet is put into sediment chamber, vacuumize, when vacuum tightness is evacuated to below 20Pa, open pyrolyzer, control 690 ℃ of pyrolyzer temperature, parylene film gas is cracked into monomer, and enter sediment chamber, under cold-trap effect, be deposited on surface of Nd-Fe-B permanent magnet.
5. surface treatment method as claimed in claim 4, the time of described chemical vapor deposition film forming is 5 ~ 30 minutes.
6. the surface treatment method as described in as arbitrary in claim 1 ~ 4, the thickness of described parylene film is 5 ~ 30 microns.
7. the surface treatment as described in as arbitrary in claim 1 ~ 5, wherein, described permanent magnet material is sintered Nd-Fe-B permanent magnetic material or binding Nd-Fe-B permanent magnetic material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210446100.8A CN103805993A (en) | 2012-11-08 | 2012-11-08 | Permanent magnetic material surface treatment method |
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| CN201210446100.8A CN103805993A (en) | 2012-11-08 | 2012-11-08 | Permanent magnetic material surface treatment method |
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| CN103805993A true CN103805993A (en) | 2014-05-21 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105803443A (en) * | 2014-12-29 | 2016-07-27 | 天津三环乐喜新材料有限公司 | Permanent magnet material surface treatment method |
| WO2016118735A1 (en) * | 2015-01-22 | 2016-07-28 | Medtronic Xomed, Inc. | Corrosion-resistant magnetic article |
| US9931493B2 (en) | 2015-01-22 | 2018-04-03 | Medtronic Xomed, Inc. | Corrosion-resistant magnetic article |
| CN110767440A (en) * | 2019-10-17 | 2020-02-07 | 上海史笛威磁性材料有限公司 | Surface treatment method of magnet, system and application of magnet |
-
2012
- 2012-11-08 CN CN201210446100.8A patent/CN103805993A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105803443A (en) * | 2014-12-29 | 2016-07-27 | 天津三环乐喜新材料有限公司 | Permanent magnet material surface treatment method |
| WO2016118735A1 (en) * | 2015-01-22 | 2016-07-28 | Medtronic Xomed, Inc. | Corrosion-resistant magnetic article |
| US9775974B2 (en) | 2015-01-22 | 2017-10-03 | Medtronic Xomed, Inc. | Corrosion-resistant magnetic article |
| US9931493B2 (en) | 2015-01-22 | 2018-04-03 | Medtronic Xomed, Inc. | Corrosion-resistant magnetic article |
| CN110767440A (en) * | 2019-10-17 | 2020-02-07 | 上海史笛威磁性材料有限公司 | Surface treatment method of magnet, system and application of magnet |
| CN110767440B (en) * | 2019-10-17 | 2021-10-12 | 上海史笛威磁性材料有限公司 | Surface treatment method of magnet, system and application of magnet |
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Application publication date: 20140521 |