CN102581287A - Surface hot dipping and pore sealing method of neodymium-iron-boron permanent magnet material - Google Patents
Surface hot dipping and pore sealing method of neodymium-iron-boron permanent magnet material Download PDFInfo
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- CN102581287A CN102581287A CN2012100403183A CN201210040318A CN102581287A CN 102581287 A CN102581287 A CN 102581287A CN 2012100403183 A CN2012100403183 A CN 2012100403183A CN 201210040318 A CN201210040318 A CN 201210040318A CN 102581287 A CN102581287 A CN 102581287A
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Abstract
A surface hot dipping and pore sealing method of a neodymium-iron-boron permanent magnet material belongs to the technical field of surface corrosion protection of neodymium-iron-boron permanent magnet materials. The method comprises the steps of heating a neodymium-iron-boron permanent magnet at 120-240 DEG C for 1-2.5h; and impregnating the heated neodymium-iron-boron permanent magnet in a pore sealing agent and sealing micropores on the surface of the neodymium-iron-boron permanent magnet, and taking out untill the surface temperature of the neodymium-iron-boron permanent magnet is lower than 40 DEG C. The pore sealing agent is methyl oleate and/or ethyl oleate, and the ratio of methyl oleate to ethyl oleate is 1:1 or 1:2 when the pore sealing agent employs a mixture of methyl oleate and ethyl oleate. By adoption of the pore sealing method, after the heated neodymium-iron-boron permanent magnet contacts the low-temperature pore sealing agent, the volume of the surface micropores is reduced and the pressure inside the micropore is reduced, so that the pore sealing agent is sucked into the micropores and plays a role in sealing pores of the neodymium-iron-boron permanent magnet, and the corrosion reduction of acidic and basic solutions to the magnet surface is facilitated in an electroplating process. The neodymium-iron-boron permanent magnet subjected to sealing pore is uniform in surface structure, and ensures the bonding force and the corrosion resistant performance of an electroplating layer in the subsequent electroplating process.
Description
Technical field
The invention belongs to neodymium-iron-boron permanent magnetic material surface aseptic technic field, particularly relate to a kind of surperficial hot dipping sealing of hole processing method of Nd-Fe-Bo permanent magnet material.
Technical background
At first produce Nd from people such as nineteen eighty-three SUMITOMO CHEMICAL particulate metal Sagawa of company
2Fe
14Since the B compound was the sintered NdFeB series permanent magnetic material of matrix, the development of Nd-Fe-Bo permanent magnet material very rapidly.It has effectively promoted the development of modern science and technology and information industry, for the appearance of novel industry provides material guarantee.The sintered Nd-Fe-B permanent magnetic material application mainly contains electronic information, auto industry, Medical Devices, energy traffic, frontiers such as industry economize on electricity power motor, energy-conserving and environment-protective household electrical appliances and green energy source wind power generating at present.In addition, magnetic suspension train that is developing and automatic high-speed railway also need a large amount of high performance permanent magnetic materialses.
Because Nd content is high in the material, the chemical property of material is very active, thus material very easily oxidation in malaria, with acid generation strong reaction.One of effective ways of the anticorrosion problem of solution Nd-Fe-B permanent magnet are at present: at magnet surface plated metal corrosion-resistant coating.On neodymium iron boron magnetic body, electroplating the subject matter that exists is: there is rich Nd phase in the crystal boundary place of Nd Fe B alloys, very easily produces intercrystalline corrosion, and the improper meeting of pre-treatment causes binding force of cladding material to descend; Neodymium iron boron magnetic body is processed by powder sintered, and rough surface and have a large amount of holes can infiltrate the corrosion that can cause matrix and coating after acid, alkali and the electroplate liquid in electroplating process; Because magnet surface tissue odds is even, can cause coating porosity increase when electroplating, reduce the protective of coating.To above these problems, in the pre-treatment that neodymium iron boron magnetic body is electroplated, must adopt suitable hole-sealing technology, could guarantee the adhesion and the Corrosion Protection of electrodeposited coating.
Summary of the invention
To the technical problem of above-mentioned Nd-Fe-B permanent magnet corrosion resistance difference, the purpose of this invention is to provide a kind of surperficial hot dipping method for sealing of Nd-Fe-Bo permanent magnet material, adopt the method can make the neodymium iron boron surface obtain excellent corrosion resisting performance.
To achieve these goals, technical scheme of the present invention comprises following processing step:
1. the surperficial hot dipping method for sealing of a Nd-Fe-Bo permanent magnet material, it is characterized in that: at first, Nd-Fe-B permanent magnet is heated in 120～240 ℃ of temperature, be 1～2.5 hour heat time heating time; Then, the Nd-Fe-B permanent magnet after the heating impregnated in the micropore that seals surface of Nd-Fe-B permanent magnet in the hole sealing agent, treat to take out after the permanent magnet surfaces temperature is lower than 40 ℃.
2. described hole sealing agent is selected one or both in methyl oleate, the ethyl oleate for use.
3. during two kinds of mixtures of said methyl oleate and ethyl oleate, its ratio is 1: 1 or 1: 2.
The invention has the beneficial effects as follows:
1. there is a large amount of micropores in the surface of Nd-Fe-B permanent magnet after the present invention's heating; Through the principle of expanding with heat and contract with cold; Micro pore volume dwindles behind the hole sealing agent of the micropore contact low temperature of high temperature; The hole internal pressure reduces hole sealing agent is sucked the effect of playing sealing magnet hole, and this helps to reduce the erosion to magnet surface of various acidity in the electroplating process, alkaline solution.
2. the Nd-Fe-B permanent magnet that carries out the sealing of hole processing is carried out mechanical chamfering, oil removing, pickling, activation pre-treating technology, then at surface of Nd-Fe-B permanent magnet plating ambrose alloy nickel coating.Owing to the magnet surface even tissue behind the sealing of hole, guaranteed the adhesion and the Corrosion Protection of electrodeposited coating.
The specific embodiment
According to embodiment the present invention is elaborated below.
Embodiment 1: the employing trade mark is 35SH, and specification is 5 of the Nd-Fe-B permanent magnets of 45 * 45 * 8.7mm, and wherein 1 is directly carried out mechanical chamfering, oil removing, pickling, activation pre-treating technology, then at surface of Nd-Fe-B permanent magnet plating ambrose alloy nickel coating.Operate according to following processing step for all the other 4:
(1) respectively with in oleic acid propyl ester, the butyl oleate one or both according to 1: 1, four kinds of hole sealing agents of ratio preparation of 1: 2;
(2) Nd-Fe-B permanent magnet is put into baking oven and heat, heating-up temperature is 200 ℃, and timing is 2 hours behind the arrival design temperature;
(3) from baking oven, take out Nd-Fe-B permanent magnet, four permanent magnets are immersed in respectively in four kinds of hole sealing agent solution fully, treat to take out after the permanent magnet surfaces temperature is lower than 40 ℃;
(4) Nd-Fe-B permanent magnet that carries out the sealing of hole processing is carried out mechanical chamfering, oil removing, pickling, activation pre-treating technology, then at surface of Nd-Fe-B permanent magnet plating ambrose alloy nickel coating.
Then, five permanent magnets carry out neutral salt spray test, and the condition of neutral salt spray test is following: temperature is that 35 ℃, concentration are 5% NaCl solution, and spray velocity is 1.5ml/Hr, and the pH value is 6.5～7.2, and the result is as shown in table 1.
Table 1
Embodiment 2:
The employing trade mark is 35SH, and specification is 5 of the Nd-Fe-B permanent magnets of 45 * 45 * 8.7mm, and wherein 1 is directly carried out mechanical chamfering, oil removing, pickling, activation pre-treating technology, then at surface of Nd-Fe-B permanent magnet plating ambrose alloy nickel coating.Operate according to following processing step for all the other 4:
(1) oleic acid propyl ester, butyl oleate are prepared hole sealing agent according to 1: 1 ratio;
(2) four Nd-Fe-B permanent magnets are put into baking oven and heat, heating-up temperature is respectively 120,160,200,240 ℃, and timing is 2 hours behind the arrival design temperature;
(3) from baking oven, take out Nd-Fe-B permanent magnet, all the other four permanent magnets are immersed in the hole sealing solution fully, treat to take out after the magnet surface temperature is lower than 40 ℃;
(4) Nd-Fe-B permanent magnet that carries out the sealing of hole processing is carried out mechanical chamfering, oil removing, pickling, activation pre-treating technology, then at surface of Nd-Fe-B permanent magnet plating ambrose alloy nickel coating;
Then, five magnets are carried out neutral salt spray test, the condition of neutral salt spray test is following: temperature is that 35 ℃, concentration are 5% NaCl solution, and spray velocity is 1.5ml/Hr, and the pH value is 6.5～7.2, and the result is as shown in table 2.
Table 2
| Sequence number | The coating classification | Heating-up temperature ℃ | The anticorrosion time h of neutral salt spray test |
| 1 | Ambrose alloy nickel | Sealing of hole not | ?24 |
| 2 | Ambrose alloy nickel | 120 | ?26 |
| 3 | Ambrose alloy nickel | 160 | ?48 |
| 4 | Ambrose alloy nickel | 200 | ?84 |
| 5 | Ambrose alloy nickel | 240 | ?72 |
Embodiment 3:
The employing trade mark is 35SH, and specification is 5 of the Nd-Fe-B permanent magnets of 45 * 45 * 8.7mm, and wherein 1 is directly carried out mechanical chamfering, oil removing, pickling, activation pre-treating technology, then at surface of Nd-Fe-B permanent magnet plating ambrose alloy nickel coating.Operate according to following processing step for all the other 4:
(1) oleic acid propyl ester, butyl oleate are prepared hole sealing agent according to 1: 1 ratio;
(2) Nd-Fe-B permanent magnet is put into baking oven and heat, heating-up temperature is 200 ℃, difference timing heating 1h, 1.5h, 2h, 2.5h behind the arrival design temperature;
(3) from baking oven, take out Nd-Fe-B permanent magnet, all the other four permanent magnets are immersed in the hole sealing agent solution fully, treat to take out after the magnet surface temperature is lower than 40 ℃;
(4) Nd-Fe-B permanent magnet that carries out the sealing of hole processing is carried out mechanical chamfering, oil removing, pickling, activation pre-treating technology, then at surface of Nd-Fe-B permanent magnet plating zinc, nickel, zinc-nickel, ambrose alloy nickel coating;
Then, five magnets are carried out neutral salt spray test, the condition of neutral salt spray test is following: temperature is that 35 ℃, concentration are 5% NaCl solution, and spray velocity is 1.5ml/Hr, and the pH value is 6.5～7.2, and the result is as shown in table 3.
Table 3
| Sequence number | The coating classification | Heat time heating time h | The anticorrosion time h of neutral salt spray test |
| 1 | Ambrose alloy nickel | Sealing of hole not | ?24 |
| 2 | Ambrose alloy nickel | ?1 | ?32 |
| 3 | Ambrose alloy nickel | ?1.5 | ?72 |
| 4 | Ambrose alloy nickel | ?2 | ?100 |
| 5 | Ambrose alloy nickel | ?2.5 | ?96 |
Claims (3)
1. the surperficial hot dipping method for sealing of a Nd-Fe-Bo permanent magnet material, it is characterized in that: at first, Nd-Fe-B permanent magnet is heated in 120～240 ℃ of temperature, be 1～2.5 hour heat time heating time; Then, the Nd-Fe-B permanent magnet after the heating impregnated in the micropore that seals surface of Nd-Fe-B permanent magnet in the hole sealing agent, treat to take out after the permanent magnet surfaces temperature is lower than 40 ℃.
2. according to the surperficial hot dipping method for sealing of the described Nd-Fe-Bo permanent magnet material of claim 1, it is characterized in that: described hole sealing agent is selected one or both in methyl oleate, the ethyl oleate for use.
3. according to the surperficial hot dipping method for sealing of the described Nd-Fe-Bo permanent magnet material of claim 2, it is characterized in that: when adopting two kinds of mixtures of said methyl oleate and ethyl oleate, its ratio is 1: 1 or 1: 2.
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| CN2012100403183A CN102581287A (en) | 2012-02-22 | 2012-02-22 | Surface hot dipping and pore sealing method of neodymium-iron-boron permanent magnet material |
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| CN2012100403183A CN102581287A (en) | 2012-02-22 | 2012-02-22 | Surface hot dipping and pore sealing method of neodymium-iron-boron permanent magnet material |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102921955A (en) * | 2012-10-17 | 2013-02-13 | 东北大学 | Wet chemistry method for preparing rare-earth permanent magnet RE-Fe-B powder |
| CN105598456A (en) * | 2015-09-18 | 2016-05-25 | 扬州海昌粉末冶金有限公司 | Method for sealing hole of injection-molding stainless steel product in silanization way and water solution formula and application of silane coupling agent |
| CN109016903A (en) * | 2018-07-20 | 2018-12-18 | 东莞市晶博光电有限公司 | One kind being avoided that the heterochromatic non-uniform silk screen printing process of printing |
| CN110804756A (en) * | 2019-11-15 | 2020-02-18 | 张彩真 | Neodymium iron boron electroplating device |
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| JPS6297311A (en) * | 1985-10-24 | 1987-05-06 | Seiko Epson Corp | Manufacture of permanent magnet |
| CN1336672A (en) * | 2000-07-31 | 2002-02-20 | 冲微型技研株式会社 | High corrosion-resistant type Nd-Fe-B magnetic iron |
| CN1955342A (en) * | 2005-10-28 | 2007-05-02 | 中国船舶重工集团公司第七二五研究所 | Method for electroplating double-layer admiro film on Nd-Fe-B magnetic surface |
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2012
- 2012-02-22 CN CN2012100403183A patent/CN102581287A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS6297311A (en) * | 1985-10-24 | 1987-05-06 | Seiko Epson Corp | Manufacture of permanent magnet |
| CN1336672A (en) * | 2000-07-31 | 2002-02-20 | 冲微型技研株式会社 | High corrosion-resistant type Nd-Fe-B magnetic iron |
| CN1955342A (en) * | 2005-10-28 | 2007-05-02 | 中国船舶重工集团公司第七二五研究所 | Method for electroplating double-layer admiro film on Nd-Fe-B magnetic surface |
Non-Patent Citations (2)
| Title |
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| 《电子工艺技术》 20090731 张蕾等 钕铁硼永磁材料电镀锌镍合金工艺 第30卷, 第4期 * |
| 张蕾等: "钕铁硼永磁材料电镀锌镍合金工艺", 《电子工艺技术》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102921955A (en) * | 2012-10-17 | 2013-02-13 | 东北大学 | Wet chemistry method for preparing rare-earth permanent magnet RE-Fe-B powder |
| CN102921955B (en) * | 2012-10-17 | 2015-09-30 | 东北大学 | A kind of wet chemical is for the method for rare earth permanent magnet RE-Fe-B powder |
| CN105598456A (en) * | 2015-09-18 | 2016-05-25 | 扬州海昌粉末冶金有限公司 | Method for sealing hole of injection-molding stainless steel product in silanization way and water solution formula and application of silane coupling agent |
| CN109016903A (en) * | 2018-07-20 | 2018-12-18 | 东莞市晶博光电有限公司 | One kind being avoided that the heterochromatic non-uniform silk screen printing process of printing |
| CN110804756A (en) * | 2019-11-15 | 2020-02-18 | 张彩真 | Neodymium iron boron electroplating device |
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Application publication date: 20120718 |