CN103752484A - Surface treatment method for permanent magnetic material and permanent magnetic material - Google Patents
Surface treatment method for permanent magnetic material and permanent magnetic material Download PDFInfo
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- CN103752484A CN103752484A CN201110459067.8A CN201110459067A CN103752484A CN 103752484 A CN103752484 A CN 103752484A CN 201110459067 A CN201110459067 A CN 201110459067A CN 103752484 A CN103752484 A CN 103752484A
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Abstract
The invention discloses a surface treatment method for permanent magnetic material and permanent magnetic material. The surface treatment method for permanent magnetic material includes: (1) polishing the surface of the permanent magnetic material; (2) degreasing the polished permanent magnetic material and removing oil; (3) pickling the degreased and oil removed permanent magnetic material to remove the rust; (4) spraying fluororesin to the pickled and dust removed permanent magnetic material to form a coat on the surface thereof; (5) roasting and cooling the permanent magnetic material with the coat. The neodymium iron boron permanent magnetic material treated by the method is salt spray resistant and humidity resistant and has lower high-temperature demagnetizing rate.
Description
Technical field
The present invention relates to a kind of surface treatment method of permanent-magnet material and the permanent-magnet material of processing through this surface treatment method.
Background technology
The application and development of neodymium iron boron (NdFeB) permanent-magnet material is very rapid in recent years, to effective protection of Nd-Fe-Bo permanent magnet material, is to be related to one of key technology that Nd-Fe-Bo permanent magnet material applies.Nd-Fe-Bo permanent magnet material is to be mainly prepared from by powder metallurgical technique by elements such as rare earth metal neodymium, iron and boron.As the strongest material of current magnetic, Nd-Fe-Bo permanent magnet material has been widely used in all fields such as electroplating device, machinery, medical treatment, automobile, and application prospect is very wide.
The prerequisite of Nd-Fe-Bo permanent magnet material extensive use is to resolve the Anticorrosion of Nd-Fe-Bo permanent magnet material.As a kind of porous material being prepared from by powder metallurgical technique, Nd-Fe-Bo permanent magnet material is easy to occur intercrystalline corrosion because rich neodymium is present in neodymium iron boron principal phase crystal boundary mutually.Simultaneously, the character of the rear earth element nd in neodymium iron boron powder alloy 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 service life of Nd-Fe-B permanent magnet, reduce stability and the reliability of product.The magnetic property of Nd-Fe-Bo permanent magnet material and its institutional framework have very large relation, and wherein, the principal phase of Nd-Fe-B permanent magnet is the main source of magnet magnetic property, and the relatively coercitive contribution of rich neodymium is maximum.After Nd-Fe-Bo permanent magnet material corrodes, the magnetic property of material will be greatly weakened.Therefore, the Anticorrosion of Nd-Fe-Bo permanent magnet material is to need one of subject matter solving always.
The anti-corrosion method of Nd-Fe-Bo permanent magnet material has much at present.Wherein there are the several different methods such as electronickelling, electrogalvanizing (CN1421547A, CN1056133A), shooting of multi-layer nickel electroplating, copper facing (CN1514889A), phosphatization, electrophoretic paint.
The high temperature demagnetizing factor of the Nd-Fe-Bo permanent magnet material after processing with existing anti-corrosion method is generally 2%～15%.But, wish further to reduce high temperature demagnetizing factor.
Summary of the invention
The surface treatment method that the object of this invention is to provide a kind of Nd-Fe-Bo permanent magnet material, the Nd-Fe-Bo permanent magnet material after processing by the method, not only salt spray resistance but also wet-heat resisting, and there is lower high temperature demagnetizing factor.
To achieve these goals, the invention provides a kind of surface treatment method of permanent-magnet material, the method comprises the steps:
Described permanent-magnet material is carried out to pretreatment;
To pretreated permanent magnetic material surface spraying fluororesin, thereby obtain coating at permanent magnetic material surface;
Permanent-magnet material after spraying is carried out to post processing.
To achieve these goals, the present invention also provides a kind of permanent-magnet material, and it has the high temperature demagnetizing factor below 0.5%.
Utilize the neodymium-iron-boron permanent magnetic material surface after surface treatment method provided by the invention is processed even, there is good Corrosion Protection: the life-span against corrosion of damp heat test (80 ℃ of temperature, relative humidity 90%) reaches 500 hours, the life-span against corrosion of neutral salt spray test reaches 150 hours, the life-span against corrosion of high temperature and pressure test is 500 hours, and high temperature demagnetizing factor is below 0.5%.
The specific embodiment
In order to illustrate further the present invention, be now described in detail as follows in conjunction with the embodiments.Illustrated embodiment only, for the present invention is described, is not intended to limit the present invention.
embodiment 1
First 2.5kg is of a size of
the sintered Nd-Fe-B permanent magnetic material of (external diameter * internal diameter * thickness) carries out pretreatment, concrete steps are: in vibrating ball-mill, mechanical vibration is 2 hours, then use alkaline solution (sodium phosphate 20g/L, sodium carbonate 10g/L and NaOH 10g/L) degreasing degreasing, pickling in 1% salpeter solution subsequently, to remove the oxide of permanent magnetic material surface, last clear water rinses, dries up, and obtains the permanent-magnet material of surface cleaning.Adopt the method for electrostatic spraying on the clean surface of permanent-magnet material, to spray PTFE (polytetrafluoroethylene (PTFE)) resin, spray tip diameter is 1.0 millimeters, better spraying 2～5 times, and the thickness of coating is 20 μ m.Then carry out post processing, be specially 350 degree baking 1 hour, cooling, packing.
embodiment 2
Method according to embodiment 1 is of a size of 2.5kg
binding Nd-Fe-B permanent magnetic material carry out pretreatment so that surface cleaning.Adopt the method for electrostatic spraying to spray PTFE resin on the clean surface of permanent-magnet material, spray tip diameter is 1.5 millimeters, better spraying 2～5 times, and the thickness of coating is 25 μ m.Then carry out post processing, be specially 380 degree baking 1 hour, cooling, packing.
embodiment 3
Method according to embodiment 1 is of a size of 2.5kg
sintered Nd-Fe-B permanent magnetic material carry out pretreatment so that surface cleaning.Adopt the method for electrostatic spraying to spray PTFE resin on the clean surface of permanent-magnet material, spray tip diameter is 1.3 millimeters, better spraying 2～5 times, and the thickness of coating is 300 μ m.Then carry out post processing, be specially 350 degree baking 1 hour, cooling, packing.
embodiment 4
Method according to embodiment 1 is of a size of 2.5kg
binding Nd-Fe-B permanent magnetic material carry out pretreatment so that surface cleaning.Adopt the method for electrostatic spraying to spray PTFE resin on the clean surface of permanent-magnet material, spray tip diameter is 1.4 millimeters, better spraying 2～5 times, and the thickness of coating is 150 μ m.Then carry out post processing, be specially 350 degree baking 1 hour, cooling, packing.
embodiment 5
Method according to embodiment 1 is of a size of 2.5kg
binding Nd-Fe-B permanent magnetic material carry out pretreatment so that surface cleaning.Adopt the method for electrostatic spraying to spray PTFE resin on the clean surface of permanent-magnet material, spray tip diameter is 1.0 millimeters, better spraying 2～5 times, and the thickness of coating is 225 μ m.Then carry out post processing, be specially 350 degree baking 1 hour, cooling, packing.
comparative example 1
First 2.5kg is of a size of
sintered Nd-Fe-B permanent magnetic material mechanical vibration 2 hours in vibrating ball-mill, then use alkaline solution (sodium phosphate 20g/L, sodium carbonate 10g/L and NaOH 10g/L) degreasing degreasing, pickling in 1% salpeter solution subsequently, to remove the oxide of permanent magnetic material surface, last clear water rinses, and uses conventional method to electroplate the multiple protective layers of ambrose alloy nickel.
Here it is to be noted, polishing in embodiment 1～5 (vibration), degreasing degreasing and acid pickling and rust removing are the conventional permanent magnetic material surface preprocess method in this area, so embodiment 1～5 and comparative example 1 have adopted that identical method and operating condition are polished, degreasing degreasing and acid pickling and rust removing.But this and do not mean that can only polish according to these methods and operating condition, degreasing degreasing and acid pickling and rust removing, do not mean that and can only to permanent-magnet material, carry out surface preparation according to these steps, but can know with any possibility method and the operating condition that can know permanent-magnet material is carried out to surface preparation according to those skilled in the art yet.
The permanent-magnet material of embodiment 1～5 gained is carried out to the test of anti-corrosion performance test and high temperature demagnetize, and by logging in table 1.Table 1 is the anti-corrosion performance test of permanent-magnet material and the result of high temperature demagnetize test of embodiment 1～5 and comparative example 1 gained.Wherein, anti-corrosion performance test comprises neutral salt spray test, damp heat test (80 ℃ of temperature, relative humidity 90%) and high temperature and pressure test (be PCT test, experimental condition is PH=12.5,148 ℃, 70Mpa).Neutral salt spray test carries out according to the upper method of recording of standard GB/T 6458-86: by 5% sodium-chloride water solution (p H is 6.5～7.2), in temperature, be that 35 ℃ ± 2 ℃, relative humidity are greater than under 95% condition, for example, with the certain mist amount of falling (, 1～2mL/ (80cm
2h)) be sprayed on passivating film, adopt the mode of spraying continuously, every 24 hours is one-period.
The test of high temperature demagnetize is carried out in accordance with the following methods: measure the magnetic flux that has carried out the Nd-Fe-Bo permanent magnet material of processing with surface treatment method provided by the present invention, then this permanent-magnet material is placed 1 hour in the environment of 150 ℃, cool to subsequently normal temperature (20 ℃), so process altogether and repeatedly carry out 3 times, and then the magnetic flux of measurement Nd-Fe-Bo permanent magnet material, by calculating as follows high temperature demagnetizing factor.
Magnetic flux * 100 of the permanent-magnet material before high temperature demagnetizing factor=(magnetic flux of the permanent-magnet material after magnetic flux-high temperature demagnetize test of the permanent-magnet material before the test of high temperature demagnetize)/high temperature demagnetize test.
Table 1
As can be seen from Table 1, the method that permanent-magnet material provides according to embodiment 1～5 is carried out after surface treatment, there is good antiseptic property, not only the life-span against corrosion of high temperature and pressure test and damp heat test has reached respectively 500 hours, and the life-span against corrosion of neutral salt spray test also reached 150 hours, so its antiseptic property is superior.And use surface treatment method provided by the present invention to greatly reduce the high temperature demagnetizing factor of permanent-magnet material, the high temperature demagnetizing factor of permanent-magnet material can be controlled at below 0.5%, far below the high temperature demagnetizing factor of prior art 2～15%.
Those skilled in the art within the spirit and scope of the present invention, can carry out various modifications, replacement or improvement to the present invention.Protection scope of the present invention is as the criterion with claims.
Claims (10)
1. a surface treatment method for permanent-magnet material, is characterized in that, described surface treatment method comprises the steps:
Described permanent-magnet material is carried out to pretreatment;
To pretreated permanent magnetic material surface spraying fluororesin, thereby obtain coating at permanent magnetic material surface;
Permanent-magnet material after spraying is carried out to post processing.
2. surface treatment method according to claim 1, is characterized in that, one or more during described pretreatment comprises the steps:
Polish on surface to described permanent-magnet material;
Described permanent-magnet material is carried out to degreasing degreasing;
Described permanent-magnet material is carried out to acid pickling and rust removing.
3. surface treatment method according to claim 1, is characterized in that, described post processing comprises baking and cooling.
4. surface treatment method according to claim 1, is characterized in that, described fluororesin is polytetrafluoroethylene (PTFE).
5. surface treatment method according to claim 1, is characterized in that, described spraying is electrostatic spraying, and is repeatedly spraying, and spraying number of times is 2～5 times.
6. surface treatment method according to claim 1, is characterized in that, the thickness of described coating is 20～300 μ m.
7. surface treatment method according to claim 1, is characterized in that, described permanent-magnet material is sintered Nd-Fe-B permanent magnetic material or binding Nd-Fe-B permanent magnetic material.
8. a permanent-magnet material, is characterized in that, the high temperature demagnetizing factor of described permanent-magnet material is below 0.5%.
9. permanent-magnet material according to claim 8, is characterized in that, the surface of described permanent-magnet material has that in claim 1～7 surface treatment method described in any one is processed and the coating that obtains.
10. permanent-magnet material according to claim 8, is characterized in that, described permanent-magnet material is sintered Nd-Fe-B permanent magnetic material or binding Nd-Fe-B permanent magnetic material.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110459067.8A CN103752484A (en) | 2011-12-31 | 2011-12-31 | Surface treatment method for permanent magnetic material and permanent magnetic material |
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| CN201110459067.8A CN103752484A (en) | 2011-12-31 | 2011-12-31 | Surface treatment method for permanent magnetic material and permanent magnetic material |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106205995A (en) * | 2016-08-29 | 2016-12-07 | 京磁材料科技股份有限公司 | A kind of processing method of Sintered NdFeB magnet |
| CN107146706A (en) * | 2017-04-05 | 2017-09-08 | 广州市广珠电池有限公司 | Corrosion-resistant, anti abrasive coating magnet and preparation method thereof |
-
2011
- 2011-12-31 CN CN201110459067.8A patent/CN103752484A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106205995A (en) * | 2016-08-29 | 2016-12-07 | 京磁材料科技股份有限公司 | A kind of processing method of Sintered NdFeB magnet |
| CN107146706A (en) * | 2017-04-05 | 2017-09-08 | 广州市广珠电池有限公司 | Corrosion-resistant, anti abrasive coating magnet and preparation method thereof |
| CN107146706B (en) * | 2017-04-05 | 2018-08-24 | 广州市广珠电池有限公司 | Corrosion-resistant, anti abrasive coating magnet and preparation method thereof |
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Application publication date: 20140430 |