CN105839045A - Method for improving anticorrosion performance of sintered neodymium-iron-boron magnet - Google Patents
Method for improving anticorrosion performance of sintered neodymium-iron-boron magnet Download PDFInfo
- Publication number
- CN105839045A CN105839045A CN201610237819.9A CN201610237819A CN105839045A CN 105839045 A CN105839045 A CN 105839045A CN 201610237819 A CN201610237819 A CN 201610237819A CN 105839045 A CN105839045 A CN 105839045A
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- Prior art keywords
- nitrogen
- iron
- boron magnet
- neodymium
- magnet
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Classifications
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/24—Nitriding
- C23C8/26—Nitriding of ferrous surfaces
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/02—Pretreatment of the material to be coated
Abstract
The invention provides a method for improving the anticorrosion performance of a sintered neodymium-iron-boron magnet and belongs to the field of rare earth magnetic materials and surface treatment. The method includes the steps that pretreatment is performed, and the neodymium-iron-boron magnet is polished and cleaned; the pre-treated neodymium-iron-boron magnet is put into a vacuum furnace to be sealed, vacuumizing is performed through a vacuum pump, 0.1 Mpa to 0.2 Mpa of nitrogen is injected when the air pressure in the furnace drops below 20 pa, then vacuumizing is performed, the operation is performed for 2 to 3 times, and gas washing is performed; and then the temperature of the vacuum furnace is increased, nitrogen is injected after the temperature reaches 400 DEG C to 750 DEG C, the pressure of nitrogen is maintained within the range of 1*10<3> pa to 1*10<5> pa, the treatment time is controlled to be within the range of 2 h to 24 h, natural cooling in the furnace is performed after anticorrosion treatment is completed, and a compound anticorrosion layer containing the nitrogen element is generated on the surface of the magnet, wherein the thickness of the compound anticorrosion layer ranges from 1 micrometer to 50 micrometers. By the adoption of the method for improving the anticorrosion performance of the sintered neodymium-iron-boron magnet, operation is easy, pollution is avoided, the treated neodymium-iron-boron magnet is high in anticorrosion performance, and the method is suitable for mass production and is no limitations on sizes and shapes of magnets.
Description
Technical field
The invention belongs to rareearth magnetic material and field of surface treatment, particularly relate to a kind of raising Sintered NdFeB magnet
The method of antiseptic property.
Background technology
Neodymium iron boron is as third generation rare-earth permanent magnet material, owing to having the magnetic property of excellence and good machining characteristics,
It is widely used in many technical fields such as Aero-Space, microwave communication, motor, wind-power electricity generation and automobile.But this kind of forever
Magnet poor chemical stability, the most oxidizable, serious electrochemical corrosion can occur under humid conditions,
Deteriorate magnetic property and affect the service life of magnet.
At present, the method for the antiseptic property improving neodymium iron boron magnetic body mainly adds alloying element and surface processes, and adds and closes
Gold element can improve magnet corrosion stability on certain Cheng Du, but due to the addition of alloying element, Partial Elements can be dissolved in neodymium
In iron boron magnet principal phase, the magnetic property of infringement magnet.Surface treatment method is to improve Sintered NdFeB magnet antiseptic property
Important channel, main process technique has the process of surface treatment such as plating, chemical plating, spraying and vacuum ion plating, but
There is obvious shortcoming in these techniques, there is wall and corner effect during galvanoplastic plating, and thickness of coating is uneven, and defect is many, no
It is suitable for having deep hole, complicated part；Chemical plating is similar to plating, and coating is poor with basal body binding force, and easy peeling comes off also
And can produce substantial amounts of sewage, and the harm of intractability height is big；When spraying process is for processing the magnet of small volume, difficulty is high,
Paint waste is serious, and these protective layers there is also the problem such as loosely of the combination with magnet, once protective layer part or complete
Portion comes off, and its decay resistance will decline rapidly；Although vacuum ion plating can improve the adhesion of coating and matrix,
But it is big to there is equipment investment in this technique, and production efficiency is low, it is impossible to the shortcoming processing complex parts.
Summary of the invention
It is an object of the invention to provide a kind of method improving Sintered NdFeB magnet antiseptic property, the method is simple to operate,
Pollution-free, and the neodymium iron boron magnetic body decay resistance processed is strong.The present invention is achieved through the following technical solutions:
A kind of method improving Sintered NdFeB magnet antiseptic property, comprises the following steps:
The first step: pretreatment, carries out neodymium iron boron magnetic body polishing, cleaning；
Second step: preservative treatment, is placed in heat treated under blanket of nitrogen, Surface Creation one layer by neodymium iron boron magnetic body
Anti-corrosion layer.
A kind of described method improving Sintered NdFeB magnet antiseptic property, pretreatment is polished on 800～2000 mesh sand paper
Carrying out, first use acetone soln ultrasonic cleaning after polishing, followed in turn by dehydrated alcohol ultrasonic cleaning, nitrogen dries up standby.
A kind of described method improving Sintered NdFeB magnet antiseptic property, anticorrosion treatment technology is, pretreated
Neodymium iron boron magnetic body is put into vacuum drying oven and is sealed, and by vacuum pump extracting vacuum, when stove internal gas pressure drops to below 20pa, is filled with
0.1～0.2Mpa nitrogen, then evacuation, carry out gas washing 2～3 times the most repeatedly.Then heating up vacuum drying oven, temperature reaches
After 400～750 DEG C, being filled with nitrogen, its pressure is maintained at 1 × 103～1 × 105The scope of pa, the process time controls 2～24h,
Making nitrogen react with top layer neodymium iron boron, forming thickness is the compound that 1～50 μm contain nitrogen element.After preservative treatment to be done,
Constant at holding furnace intracavity nitrogen pressure or again furnace chamber can be carried out furnace cooling on the basis of evacuation process.
Compared with prior art, the invention has the advantages that: simple to operate, the size and shape for magnet does not limit,
It is suitable for batch production, and nitrogen can be passed through in NbFeB sintered end temperature-fall period carries out preservative treatment, save energy
Source, pollution-free, and the neodymium iron boron magnetic body decay resistance processed is strong.
Detailed description of the invention
Below in conjunction with being embodied as, the present invention will be further described in detail:
Embodiment 1: select the iron boron magnet not magnetized, uses following methods to carry out this neodymium iron boron magnetic body at surface anticorrosion
Reason, improves its decay resistance.
A kind of method improving Sintered NdFeB magnet antiseptic property, comprises the following steps:
The first step: pretreatment: polish on 800 mesh sand paper, first uses acetone soln ultrasonic cleaning, subsequently after polishing
Using dehydrated alcohol ultrasonic cleaning again, nitrogen dries up standby.
Second step: preservative treatment: pretreated neodymium iron boron magnetic body is put into vacuum drying oven and seals, extracted by vacuum pump
Vacuum, when stove internal gas pressure drops to 10pa, is filled with 0.15Mpa nitrogen, then evacuation, the most repeatedly carries out gas washing 3 times.
Then vacuum drying oven is heated up, after temperature reaches 500 DEG C, be filled with nitrogen so that it is pressure is maintained at 2 × 104Pa, processes the time
For 24h.After completing preservative treatment, furnace cooling on the basis of holding furnace intracavity nitrogen pressure is constant.
Corrosion-resistant test experiments illustrates that this technique can make neodymium iron boron magnetic body decay resistance significantly improve: under room temperature,
0.5mol/L H2SO410 × 10 × 10mm in solution3Sample etches rate test result is as follows:
Embodiment 2: select the iron boron magnet not magnetized, uses following methods to carry out this neodymium iron boron magnetic body at surface anticorrosion
Reason, improves its decay resistance.
A kind of method improving Sintered NdFeB magnet antiseptic property, comprises the following steps:
The first step: pretreatment: polish on 1500 mesh sand paper, first uses acetone soln ultrasonic cleaning after polishing, with
After use dehydrated alcohol ultrasonic cleaning again, nitrogen dries up standby.
Second step: preservative treatment: pretreated neodymium iron boron magnetic body is put into vacuum drying oven and seals, extracted by vacuum pump
Vacuum, when stove internal gas pressure drops to 20pa, is filled with 0.2Mpa nitrogen, then evacuation, the most repeatedly carries out gas washing 2～3 times.
Then vacuum drying oven is heated up, after temperature reaches 400 DEG C, be filled with nitrogen so that it is pressure is maintained at 1 × 105Pa, processes the time
For 12h, after completing preservative treatment, furnace cooling on the basis of holding furnace intracavity nitrogen pressure is constant.
Under room temperature, at 0.5mol/L H2SO410 × 10 × 10mm in solution3Sample weight loss rate test result is as follows:
Claims (3)
1. the method improving Sintered NdFeB magnet antiseptic property, it is characterised in that include following
Step:
The first step: pretreatment
Carry out neodymium iron boron magnetic body polishing, cleaning；
Second step: preservative treatment
Pretreated neodymium iron boron magnetic body is put into vacuum drying oven seal, by vacuum pump extracting vacuum,
When stove internal gas pressure drops to below 20pa, it is filled with 0.1～0.2Mpa nitrogen, then evacuation, the most repeatedly
Carry out gas washing 2～3 times；Then vacuum drying oven is heated up, after temperature reaches 400～750 DEG C, is filled with nitrogen,
Its pressure is made to be maintained at 1 × 103～1 × 105The scope of pa, the process time controls 2～24h, to be done anti-
After rotten process, furnace cooling, one layer of anti-corrosion layer of Surface Creation.
A kind of method improving Sintered NdFeB magnet antiseptic property the most according to claim 1,
It is characterized in that: pretreatment is, polishing is carried out on 800～2000 mesh sand paper, first uses acetone after polishing
Solution ultrasonic cleaning, followed in turn by dehydrated alcohol ultrasonic cleaning, nitrogen dries up standby.
A kind of method improving Sintered NdFeB magnet antiseptic property the most according to claim 1,
It is characterized in that: the anti-corrosion layer thickness of formation is 1～50 μm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610237819.9A CN105839045A (en) | 2016-04-17 | 2016-04-17 | Method for improving anticorrosion performance of sintered neodymium-iron-boron magnet |
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| CN201610237819.9A CN105839045A (en) | 2016-04-17 | 2016-04-17 | Method for improving anticorrosion performance of sintered neodymium-iron-boron magnet |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110983395A (en) * | 2019-12-17 | 2020-04-10 | 广东小天才科技有限公司 | Magnet, preparation method and wearable device |
| CN111755236A (en) * | 2020-06-23 | 2020-10-09 | 安泰科技股份有限公司 | Bluing anti-corrosion method for sintered neodymium-iron-boron magnet |
| CN112786301A (en) * | 2020-12-30 | 2021-05-11 | 包头天和磁材科技股份有限公司 | Corrosion-resistant neodymium-iron-boron magnet, surface treatment method and application of hydroxyl compound |
| CN114875353A (en) * | 2022-04-27 | 2022-08-09 | 宁波同创强磁材料有限公司 | Preparation method of high-corrosion-resistance sintered neodymium-iron-boron magnet |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06145705A (en) * | 1992-11-11 | 1994-05-27 | Seiko Epson Corp | Rare earth magnet powder, rare earth bond magnet and composition for rare earth bond magnet |
| CN1103987A (en) * | 1993-12-17 | 1995-06-21 | 陶一飞 | Method for mfg. micro crystalline magnetic powder |
| WO2003034451A1 (en) * | 2001-10-15 | 2003-04-24 | Kabushiki Kaisha Toshiba | Bonded magnet and method for production thereof |
| CN202948803U (en) * | 2012-08-20 | 2013-05-22 | 烟台正海磁性材料股份有限公司 | Neodymium iron boron magnetic body |
| CN103956244A (en) * | 2014-05-14 | 2014-07-30 | 辽宁五寰科技发展有限公司 | Preparation method for high-coercivity sintered neodymium-iron-boron |
-
2016
- 2016-04-17 CN CN201610237819.9A patent/CN105839045A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06145705A (en) * | 1992-11-11 | 1994-05-27 | Seiko Epson Corp | Rare earth magnet powder, rare earth bond magnet and composition for rare earth bond magnet |
| CN1103987A (en) * | 1993-12-17 | 1995-06-21 | 陶一飞 | Method for mfg. micro crystalline magnetic powder |
| WO2003034451A1 (en) * | 2001-10-15 | 2003-04-24 | Kabushiki Kaisha Toshiba | Bonded magnet and method for production thereof |
| CN202948803U (en) * | 2012-08-20 | 2013-05-22 | 烟台正海磁性材料股份有限公司 | Neodymium iron boron magnetic body |
| CN103956244A (en) * | 2014-05-14 | 2014-07-30 | 辽宁五寰科技发展有限公司 | Preparation method for high-coercivity sintered neodymium-iron-boron |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110983395A (en) * | 2019-12-17 | 2020-04-10 | 广东小天才科技有限公司 | Magnet, preparation method and wearable device |
| CN111755236A (en) * | 2020-06-23 | 2020-10-09 | 安泰科技股份有限公司 | Bluing anti-corrosion method for sintered neodymium-iron-boron magnet |
| CN112786301A (en) * | 2020-12-30 | 2021-05-11 | 包头天和磁材科技股份有限公司 | Corrosion-resistant neodymium-iron-boron magnet, surface treatment method and application of hydroxyl compound |
| CN114875353A (en) * | 2022-04-27 | 2022-08-09 | 宁波同创强磁材料有限公司 | Preparation method of high-corrosion-resistance sintered neodymium-iron-boron magnet |
| CN114875353B (en) * | 2022-04-27 | 2024-03-19 | 宁波同创强磁材料有限公司 | Preparation method of high-corrosion-resistance sintered NdFeB magnet |
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Application publication date: 20160810 |