CN1448544A - Surface protection technology for neodymium iron boron (NdFeB) permanent magnet material - Google Patents
Surface protection technology for neodymium iron boron (NdFeB) permanent magnet material Download PDFInfo
- Publication number
- CN1448544A CN1448544A CN 02108634 CN02108634A CN1448544A CN 1448544 A CN1448544 A CN 1448544A CN 02108634 CN02108634 CN 02108634 CN 02108634 A CN02108634 A CN 02108634A CN 1448544 A CN1448544 A CN 1448544A
- Authority
- CN
- China
- Prior art keywords
- technology
- plating
- material surface
- ndfeb
- bath
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000463 material Substances 0.000 title claims abstract description 33
- 238000005516 engineering process Methods 0.000 title claims abstract description 26
- 229910001172 neodymium magnet Inorganic materials 0.000 title claims description 19
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 title claims description 8
- 238000007747 plating Methods 0.000 claims abstract description 46
- 238000007789 sealing Methods 0.000 claims abstract description 15
- 230000007935 neutral effect Effects 0.000 claims abstract description 14
- 238000000576 coating method Methods 0.000 claims description 14
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 12
- 239000011248 coating agent Substances 0.000 claims description 11
- 230000002378 acidificating effect Effects 0.000 claims description 10
- 241000080590 Niso Species 0.000 claims description 8
- 238000005498 polishing Methods 0.000 claims description 6
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 5
- 238000007598 dipping method Methods 0.000 claims description 5
- 229960004418 trolamine Drugs 0.000 claims description 5
- 239000000654 additive Substances 0.000 claims description 4
- 230000000996 additive effect Effects 0.000 claims description 4
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims description 4
- 239000004327 boric acid Substances 0.000 claims description 4
- AGGKEGLBGGJEBZ-UHFFFAOYSA-N tetramethylenedisulfotetramine Chemical compound C1N(S2(=O)=O)CN3S(=O)(=O)N1CN2C3 AGGKEGLBGGJEBZ-UHFFFAOYSA-N 0.000 claims description 4
- UEUXEKPTXMALOB-UHFFFAOYSA-J tetrasodium;2-[2-[bis(carboxylatomethyl)amino]ethyl-(carboxylatomethyl)amino]acetate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-]C(=O)CN(CC([O-])=O)CCN(CC([O-])=O)CC([O-])=O UEUXEKPTXMALOB-UHFFFAOYSA-J 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 3
- 239000000696 magnetic material Substances 0.000 claims description 3
- 239000007864 aqueous solution Substances 0.000 claims description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 abstract description 22
- 238000000034 method Methods 0.000 abstract description 16
- 229910052759 nickel Inorganic materials 0.000 abstract description 11
- 238000009713 electroplating Methods 0.000 abstract description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 6
- 239000002253 acid Substances 0.000 abstract description 5
- 239000002131 composite material Substances 0.000 abstract description 3
- 229910052742 iron Inorganic materials 0.000 abstract description 3
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052796 boron Inorganic materials 0.000 abstract description 2
- 150000003839 salts Chemical class 0.000 abstract description 2
- 239000007921 spray Substances 0.000 abstract 1
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 238000005406 washing Methods 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- FVHAWXWFPBPFOS-UHFFFAOYSA-N 1,2-dimethyl-3-nitrobenzene Chemical group CC1=CC=CC([N+]([O-])=O)=C1C FVHAWXWFPBPFOS-UHFFFAOYSA-N 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 229910052761 rare earth metal Inorganic materials 0.000 description 3
- 150000002910 rare earth metals Chemical class 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910052779 Neodymium Inorganic materials 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000004519 grease Substances 0.000 description 2
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000002203 pretreatment Methods 0.000 description 2
- 239000003566 sealing material Substances 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
Landscapes
- Electroplating And Plating Baths Therefor (AREA)
- Electroplating Methods And Accessories (AREA)
Abstract
The invention relates to a surface protection technology for a permanent magnet material containing iron, iron and boron, which adopts a material surface nickel electroplating technology, adopts a material surface hole sealing technology in a pretreatment process, adopts a neutral plating solution and acid plating solution composite plating technology in a plating process, the thickness of a plating layer can reach 5-25 mu m according to requirements, and the surface protection performance of the material can reach 200-800 hours (salt spray test).
Description
Affiliated technical field
The present invention relates to the mmaterial surface protection technique, relate in particular to a kind of neodymium-iron-boron permanent magnetic material surface guard technology.
Background technology
The appearance of third generation rare-earth permanent magnet neodymium iron boron (Nd-Fe-B) magneticsubstance has produced tremendous influence to the development of modern high technology industry.This material mainly is to be prepared from by powder metallurgical technique by elements such as rare earth metal neodymium (Nd), iron and boron.Be the strongest present magneticsubstance, can be widely used in electron device, aspects such as machinery and medicine equipment, application prospect is very wide.
The prerequisite that this magneticsubstance is used is, the necessary coated one deck protective layer of this material surface, thereby can ensure that just material is not corroded in practical process, because the rare earth metal neodymium in this material is more active metal, even also very easily oxidation (corrosion) under normal air ambient.
At present, the means of defence on NdFeB material surface has electrophoretic coating method and metal coating.Electrophoretic coating method wherein, because this material is to be prepared by sintering process by different metal-powders, therefore, can't directly carry out electrophoretic coating, need carry out in advance can carrying out electrophoretic coating behind the plated metal, though this coating has protective effect preferably, its hardness, intensity and wear resistance can't satisfy the service requirements under the particular surroundings.
Metal coating comprises that the NdFeB material surface electrical is zinc-plated, and electro-coppering and electronickelling wherein comprise individual layer plating and multilayer plating again.But all metal coatings must carry out pre-treatment (to eliminate material surface dirt and oxide compound) before the plating, then electroplate in acid, alkaline or neutral plating bath.Facts have proved that pre-treatment is the critical process that ensures electroplating quality, the pre-treating process that adopts is the test portion chamfering at present, and------the ultrasonic method electrochemical deoiling---electroplate by washing bright dipping---washing---in washing.Because NdFeB material is to be formed through sintering by the different metal powder, it has porousness, therefore, above-mentioned various traditional pre-treating process can't ensure processed very clean (containing molecule and oil stain) and the not processed corrosion in hole place of this material surface.
The acid-basicity of the electroplate liquid that adopts, it also is the gordian technique that influences the plated metal quality, though neutral electroplate liquid is less to the corrodibility of material, but seriously influence electroplating velocity, though acid electroplating liquid has the ideal electroplating velocity, but the quality of guarantee electrolytic coating that can't be stable (for example, pin hole, burr, peeling etc.).At present, the acid electroplating of widespread use or neutral the plating all can't be satisfied material surface and be had the salt fog resistance test and reach more than the 500h.Thereby seriously influence the effect of NdFeB material under particular surroundings.
Three,
Summary of the invention
The present invention just provides a kind of new Technology, can't satisfy the barrier propterty requirement on NdFeB material surface thereby overcome present prior art effectively because of the technical problem that exists.
It is the sealing material and the hole sealing technology of material surface that the present invention adopts material surface hole sealing technology and gordian technique neutral, the required solution of acid composite plating technology; Neutrality, acidic bath additive material and adding technology.
The present invention solves the technical scheme that its technical problem takes: different sealing materials and method for sealing be to electrolytic coating quality and Effect on Performance, and neutral, acidic bath composition and additive are to electrolytic coating quality and Effect on Performance; Composite depositing process neutral and acidic bath carries out test determination to electrolytic coating quality and Effect on Performance.Its principles of science is that according to the absorption principle of porous material, the material that sorptive power is low more at first adsorbs; Potential difference is big more, is beneficial to electroplating principle more.
NdFeB material at first through the chamfering polishing, grinds off machining vestige and optic angle, after the alkali grease removal, at 3%-5%HNO
3Bright dipping in the solution, water Xian 2-3 time puts into hole sealing agent the surface pore is sealed, activated again after, put into neutral plating bath nickel plating, be 0.2A-0.5A/cm in current density
2, under the PH=6.8-7.2 situation, plating 20-30 minute, directly put into acidic bath nickel plating after the taking-up.In current density is 0.5A-2A/cm
2, under the PH=4.6-4.8 situation plating 1-3 hour.Wash 4-6 time immediately after the plating material takes out, be packaged into finished product after drying up with gas blower.
Can be according to customer requirements, electroless nickel layer thickness reaches 5 μ m-25 μ m, and corrosion resistance (salt-fog test) reached 200 hours-800 hours.
The invention has the beneficial effects as follows, under the situation that does not increase facility investment, by adopting hole sealing technology and neutral, the compound coating technology of acidic bath, significantly improve the quality and the performance of electroless nickel layer, thereby make Nd-Fe-Bo permanent magnet material have more wide application prospect.
Four,
Accompanying drawing
Do not have
Five,
Embodiment
Below in conjunction with specific embodiment, the invention will be further described
Embodiment 1
With 2.5 kilograms of the neodymium iron boron test portions of φ 10 * 6, polishing 2 hours 30 minutes in polishing machine earlier is through alkali (Na
3PO
420-40g/L; Na
2CO
310-20g/L) after the grease removal at 3%HNO
3(nitro-xylene 50g/L in hole sealing agent is washed in bright dipping in the aqueous solution 3 times; Acetic acid tri-n-butyl 20g/L; Hexamethyl tetramine 40g/L) sealing is 3 minutes, through 5%H
2SO
4After the activated in water solution, (plating bath is formed: NiSO in nickel plating in neutral plating bath
47H
2O200g/L, NiCl
25g/L, tetrasodium ethylenediamine tetraacetate 20g/L, trolamine 15ml/L), with 0.5A/cm
2Current density, PH=6.8 plating 20 minutes, (plating bath is formed: NiSO in directly nickel plating in acidic bath after the taking-up
47H
2O200g/L, NiCl
230g/L, boric acid 30g/L, asccharin 0.5g/L, 1.4-butynediol 0.05g/L), with 2A/cm
2Current density, PH=4.6 plating 1 hour again, the plating material takes out after washing 4 times, dries up, and on QS101A type salt-fog test machine, tests by GB10125, and after 746 hours, protection class is 10 (pressing GB6461).
Embodiment 2
With 4.5 kilograms of the neodymium iron boron test portions of φ 24 * 4, press embodiment 1 method polishing, degrease and bright dipping, (nitro-xylene 200g/L in hole sealing agent; Acetic acid tri-n-butyl 80g/L; Hexamethyl tetramine 60g/L) sealing is 3 minutes, through 5%H
2SO
4After the activated in water solution, (plating bath is formed: NiSO in nickel plating in neutral plating bath
47H
2O400g/L, NiCl
2100g/L, tetrasodium ethylenediamine tetraacetate 150g/L, trolamine 80ml/L), with 0.2A/cm
2Current density, PH=7.2 plating 30 minutes, (plating bath is formed: NiSO in directly nickel plating in acidic bath after the taking-up
47H
2O 400g/L, NiCl
280g/L, boric acid 60g/L, asccharin 5g/L, 1.4-butynediol 1g/L), with 0.5A/cm
2Current density, PH=4.7 plating 3 hours, the plating material takes out after washing 4 times, dries up, and on QS101A type salt-fog test machine, tests by GB10125, and after 768 hours, protection class is 10 (pressing GB6461).
Embodiment 3
With 3 kilograms of the neodymium iron boron test portions of external diameter φ 12.5, internal diameter φ 5 * 1.5, method polishing, degrease and the bright dipping of pressing embodiment 1, (nitro-xylene 120g/L in hole sealing agent; Acetic acid tri-n-butyl 55g/L; Hexamethyl tetramine 50g/L) sealing is 3 minutes, and (plating bath is formed: NiSO in activated back nickel plating in neutral plating bath
47H
2O250G/L, NiCl
280g/L, tetrasodium ethylenediamine tetraacetate 120g/L, trolamine 60ml/L), with 0.3A/cm
2Current density, PH=6.9 plating 23 minutes, (plating bath is formed: NiSO in directly nickel plating in acidic bath after the taking-up
47H
2O250g/L, NiCl
265g/L, boric acid 40g/L, asccharin 3g/L, 1.4-butynediol 0.5g/L), with 1.5A/cm
2Current density, PH=4.8 plating 2.5 hours again dries up after the washing, on QS101A type salt-fog test machine, tests by GB10125, and after 800 hours, protection class is 10 (pressing GB6461).
Claims (3)
1, a kind of neodymium iron boron (NdFeB) permanent magnetic material surface guard technology, this technology adopt material surface electronickelling technology, it is characterized in that: adopt the material surface hole sealing technology in pre-treating technology; In plating technology, adopt neutral plating bath plating compound coating technology of plating 1-3 hour in acidic bath immediately after 20-30 minute.
2, the described material surface guard technology of claim 1 is characterized in that: NdFeB material is after chamfering polishing, degrease bright dipping, at hole sealing agent---nitro-xylene 50-200g/L; Acetic acid tri-n-butyl 20-80g/L; Soak in the hexamethyl tetramine 40-60g/L aqueous solution and carried out the sealing of hole processing in 3 minutes.
3, the described material surface guard technology of claim 1 is characterized in that: the neutral plating bath in the plating technology is by NiSO
47H
2O 200-400g/L; NiCl
25-100g/L; Tetrasodium ethylenediamine tetraacetate 20-150g/L; Trolamine 15-80ml/L forms, and wherein trolamine is an additive, and current density is 0.2-0.5A/cm
2, PH=6.8-7.2.Acidic bath is by NiSO
47H
2O 200-400g/L; NiCl
230-80g/L; Boric acid 30-60g/L; Asccharin 0.5-5g/L; 1.4-butynediol 0.05-1g/L forms, wherein asccharin and 1.4-butynediol are additive, and current density is 0.5-2A/cm
2, PH=4.6-4.8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02108634 CN1448544A (en) | 2002-04-04 | 2002-04-04 | Surface protection technology for neodymium iron boron (NdFeB) permanent magnet material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02108634 CN1448544A (en) | 2002-04-04 | 2002-04-04 | Surface protection technology for neodymium iron boron (NdFeB) permanent magnet material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1448544A true CN1448544A (en) | 2003-10-15 |
Family
ID=28680316
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02108634 Pending CN1448544A (en) | 2002-04-04 | 2002-04-04 | Surface protection technology for neodymium iron boron (NdFeB) permanent magnet material |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1448544A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104368818A (en) * | 2014-10-24 | 2015-02-25 | 苏州莱特复合材料有限公司 | Iron-based powder metallurgical material electroplating technology |
| CN110791787A (en) * | 2019-12-07 | 2020-02-14 | 爱科科技有限公司 | Method for plating double-layer zinc on surface of neodymium iron boron permanent magnet material |
| CN111020659A (en) * | 2019-12-07 | 2020-04-17 | 爱科科技有限公司 | Method for reducing porosity of coating on surface of neodymium iron boron permanent magnet material |
-
2002
- 2002-04-04 CN CN 02108634 patent/CN1448544A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104368818A (en) * | 2014-10-24 | 2015-02-25 | 苏州莱特复合材料有限公司 | Iron-based powder metallurgical material electroplating technology |
| CN110791787A (en) * | 2019-12-07 | 2020-02-14 | 爱科科技有限公司 | Method for plating double-layer zinc on surface of neodymium iron boron permanent magnet material |
| CN111020659A (en) * | 2019-12-07 | 2020-04-17 | 爱科科技有限公司 | Method for reducing porosity of coating on surface of neodymium iron boron permanent magnet material |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101319316B (en) | Method for chemical nickel plating on aluminum and aluminum alloy surface | |
| CN108251872B (en) | composite electroplating method for sintered neodymium-iron-boron magnet | |
| CN102115899B (en) | Tin-nickel alloy plating solution used for plating neodymium iron boron permanent magnet material and method for plating neodymium iron boron permanent magnet material by adopting same | |
| CN104213162A (en) | Surface treatment method for zinc alloy electroplating of automobile permanent magnetic material | |
| CN102108511A (en) | Electroplating and chemical plating composite protecting process for NdFeB permanent magnet and NdFeB permanent magnet with composite protective layer | |
| CN109256256B (en) | Neodymium-iron-boron magnet with zinc-nickel alloy electroplated on surface and preparation process thereof | |
| CN102965703A (en) | Method for improving binding force of electro-galvanized layer on surface of neodymium-iron-boron permanent magnet | |
| CN101724845A (en) | Method for electroplating zinc-nickel alloy on sintered neodymium-iron-boron material | |
| CN106968003A (en) | Nd-Fe-B magnet steel overlay coating method | |
| CN102965650B (en) | Blackening layer and organic coating dual-protective method of neodymium iron boron magnetic material surface | |
| CN101440490A (en) | Novel protection technique for plating multilayer coating on surface of sintered Nd-Fe-B permanent magnet | |
| CN110904480A (en) | Surface treatment method for improving corrosion resistance of neodymium iron boron rare earth permanent magnet material | |
| CN1421547A (en) | Electroplating of Zn-Ni alloy onto surface of Nd-Fe-B permanent magnet | |
| CN101525747B (en) | Clean rare-earth salt passivation solution | |
| CN1448544A (en) | Surface protection technology for neodymium iron boron (NdFeB) permanent magnet material | |
| CN102400144B (en) | A kind of surface treatment method of mechanical plating zinc-nickel of Nd-Fe-Bo permanent magnet material | |
| CN111020482A (en) | Sintered NdFeB magnet surface densification Al coating and preparation method thereof | |
| CN111254466B (en) | Neodymium-iron-boron permanent magnet material surface galvanizing electroplating liquid and electroplating method thereof | |
| CN1804145A (en) | Method for electroplating zinc on magnesium alloy | |
| CN102400145A (en) | Surface treatment method for mechanically coating zinc, aluminum and nickel on neodymium iron boron permanent magnet material | |
| CN114592223B (en) | Neodymium-iron-boron magnet galvanization and surface lubrication process | |
| CN101857965A (en) | Method for depositing zinc and zinc-nickel alloy on surface of magnesium alloy without cyanogen or fluorine | |
| CN106783134A (en) | A kind of surface is coated with the preparation method of the viscose glue magnet assembly of protective coating | |
| CN110724982A (en) | Gold-fog electroplating process | |
| CN113846360B (en) | Non-phosphorus and non-cyanogen zinc plating process for neodymium iron boron magnet |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C57 | Notification of unclear or unknown address | ||
| DD01 | Delivery of document by public notice |
Addressee: Niu Wei Document name: Written notice of preliminary examination of application for patent for invention |
|
| C57 | Notification of unclear or unknown address | ||
| DD01 | Delivery of document by public notice |
Addressee: Niu Wei Document name: Notification before expiration of term |
|
| C57 | Notification of unclear or unknown address | ||
| DD01 | Delivery of document by public notice |
Addressee: Niu Wei Document name: Deemed as a notice of withdrawal |
|
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |