CN1285420A - Chemical nickel plating method for increasing mechanical strength of cohesive neodymium-ferro-boron permanent magnet - Google Patents
Chemical nickel plating method for increasing mechanical strength of cohesive neodymium-ferro-boron permanent magnet Download PDFInfo
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- CN1285420A CN1285420A CN 99111568 CN99111568A CN1285420A CN 1285420 A CN1285420 A CN 1285420A CN 99111568 CN99111568 CN 99111568 CN 99111568 A CN99111568 A CN 99111568A CN 1285420 A CN1285420 A CN 1285420A
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- China
- Prior art keywords
- permanent magnet
- nickel plating
- chemical nickel
- neodymium
- magnet
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Abstract
The invented main technological process is formed from three portions of chemical copper-plating surface sealing, electric nickel-plating and chemical nickel-plating, its main plating bath contains nickel sulfate, sodium hypophosphite, lactic acid and propionic acid. The adoption of this composite chemical nickel-plating method can effectively raise the characteristic mechanical strength of bonded neodymium-iron-boron permanent magnet so as to broaden its application range.
Description
Chemically coated nickel method is a key areas emerging in the Materials science, has obtained development rapidly in recent years, has broad application prospects.Chemical nickel plating is a kind of under the situation that does not add extrinsic current, utilizes reductive agent self catalyzed reduction deposition on the activation piece surface to obtain the method for Ni-P coating.
Bonded permanent magnet is to adopt magnetic material powder and binding agents such as Resins, epoxy, nylon to mix the permanent magnet of new generation that modes such as the back is adopted mold pressing, extruded, injection moulding are made in certain proportion, now is widely used in computer, office automation, all kinds of small and special electric machine, automobile and motorcycle instrument and field of medical.The batch manufacturing technology of bonded permanent magnet has also obtained development at full speed in China in recent years.Owing to bonded permanent magnet manufacture characteristic determined hour causes the low excessively defective of its intensity to hamper the application of such magnet in numerous industrial application when some direction sizes always.
In recent years, some coating methods are used to the surface treatment of boned neodymium iron boron permanent magnet, and main method has electrophoretic coating, spraying, electronickelling etc.; The main purpose of these methods is to improve the resistance to corrosion on bonded permanent magnet surface.And the present invention adopts a kind of surface coating process specially in order to improve the feature physical strength of boned neodymium iron boron permanent magnet.
The objective of the invention is to adopt the method for composite chemical nickel plating to improve the feature physical strength of bonded permanent magnet.
The nickel chemical plating technology process that the present invention adopts is as follows:
One, technical process
1, bonded permanent magnet inspection of blank
Check defectives such as whether jagged magnet blank edge
2, bonded permanent magnet surface degreasing
For obtaining the coating of even compact
3, chamfering
4, oil removing
Remove the greasy dirt that chamfering equipment may adhere to magnet surface
5, ultrasonic cleaning
30 seconds-60 seconds
6, surface active
The 1-3% hydrochloric acid soln
7, surface-sealing
Adopt electroless copper to carry out surface-sealing
Electroplate liquid formulation and technology:
Copper sulfate (CuSO
44H
2O) 5g/L
Seignette salt (KNaC
4H
4O
64H
2O) 25g/L
Formaldehyde (HCHO) (37%) 5mL/L
Sodium hydroxide (NaOH) 7g/L
Nickelous chloride (NiCl
26H
2O) 0.1g/L
Ethanol (C
2H
5OH) 33mL/L
pH 11.5-13.5
30 ℃ of temperature
8, nickel plating
Electroplate liquid formulation and technology:
Single nickel salt (Ni
2SO
47H
2O) 300g/L
Boric acid (H
3BO
3) 40g/L
30 ℃ of temperature
pH 3.0-5.0
Current density 2.5-10A/dm
2
9, chemical nickel plating
Electroplate liquid formulation and technology:
Single nickel salt (Ni
2SO
47H
2O) 15-30g/L
Sodium hypophosphite (NaH
2PO
23H
2O) 20-36g/L
Trisodium Citrate (Na
3C
6H
5O
73H
2O) 10-14g/L
Lactic acid (C
3H
6O
3) (88%) 15mL/L
Propionic acid (C
3H
6O
2) 5mL/L
pH 4.4-4.8
30 ℃ of temperature
Sedimentation velocity 10 μ m/h
Coating phosphorus content 8-13% two, coating material and thickness
1, copper plate 5--7 μ m
2, nickel layer 3--4 μ m
3, chemical nickel plating (phosphorous 8-13%) 10--12 μ m three, coating performance
1, intensity: the feature physical strength index that can effectively improve bonded permanent magnet.As:
A. can be with the radial crushing strength of sheet magnet from 2kg/m
2Bring up to 4kg/m
2More than.
B. the radially anti-pressure ability of C shape magnet can be brought up to more than the 3kg from 1.9kg.
C. can with the axial resistance to fracture ability of circular thin-wall magnet from 15kg bring up to 35kg with
On, radially anti-pressure ability is brought up to more than the 2.5kg from 1.5kg.Four, the scope of application
A, boned neodymium iron boron permanent magnet
Characteristic component:
Neodymium metal 8-30%AT (AT refers to atomic percent)
Cobalt metal 1-20%AT
Boron 2-8%AT
Metallic iron (balanced contents)
Sneak into epoxy adhesive in above-mentioned powdered alloy, content is 0.5-15%WT
(WT refers to weight percent)
B, neodymium iron boron-ferrite composite permanent magnet
Nd-fe-b permanent magnetic alloy powder 50-95%WT
Strontium ferrites or barium ferrite powder 5-50%WT
Sneak into epoxy adhesive in above-mentioned mixed powder, content is 1-15%WT.
Five, EXAMPLE Example 1:C shape Agglutinate neodymium-iron-boron magnet ring, external diameter 6.8mm, internal diameter 4.2mm, gap width 2.05mm, the vertical indentation, there feature of application request anti-pressure ability is greater than 3kg.After implementing the present invention's composite chemical Nickel Plating Treatment, vertical indentation, there feature anti-pressure ability is brought up to 3.2kg from handling preceding 1.9kg.Feature compression test mode sees that accompanying drawing 1. directions of arrow are the test pressure direction.When adopting electronickelling to handle, handle the vertical indentation, there feature anti-pressure ability in back and can only bring up to 2.9kg.When adopting electrophoretic surface to handle, handle the vertical indentation, there feature anti-pressure ability in back and can only bring up to 2.2kg.Embodiment 2: thin wall ring magnet, specification are external diameter 17.94mm, internal diameter 15.82mm, and height 10.8mm, radially anti-pressure ability is greater than 2.5kg for application request, and axially the resistance to fracture ability is greater than 35kg.After implementing the present invention's composite chemical Nickel Plating Treatment, radially anti-pressure ability is brought up to more than the 2.5kg from handling preceding 2kg.Axially the resistance to fracture ability is brought up to more than the 35kg from handling preceding 15kg.Feature compression test mode is seen accompanying drawing 2, accompanying drawing 3.The direction of arrow is the test pressure direction among the figure.When adopting electronickelling to handle, after the processing radially anti-pressure ability can only bring up to 2.3kg.Axially the resistance to fracture ability can only be brought up to 28kg.When adopting electrophoretic surface to handle, after the processing radially anti-pressure ability can only bring up to 1.7kg.Axially the resistance to fracture ability can only be brought up to 17kg.
Method provided by the invention is used for the raising of boned neodymium iron boron permanent magnet surface characteristic intensity, and effect is remarkable.Fundamentally solved the too high problem of percentage of damage when slim permanent magnet is installed in the similar example 1 on production line.Also improved greatly simultaneously thin-walled toroidal coils in the similar example 2 more further injection moulding add the yield rate in man-hour.Application extension of the present invention the Application Areas of Agglutinate neodymium-iron-boron.
Claims (4)
1, a kind of composite chemical nickel plating method that improves mechanical strength of cohesive neodymium-ferro-boron permanent magnet, key step comprises electroless copper surface-sealing, electronickelling and chemical nickel plating.
2, a kind of composite chemical nickel plating method that is used for any two or three combination step that comprise claim item 1 description of the surface amorphous coating phosphorus content of bonded permanent magnet surface-treated in the 8-13% scope.
3, in claim item 1 or 2 methods to boned neodymium iron boron permanent magnet in order to improve the surface treatment of its characteristic strength.
The characteristic component of magnet is: neodymium metal 8-30%AT (AT atomic percent)
Cobalt metal 1-20%AT
Boron 2-8%AT
Metallic iron (balanced contents)
Sneak into epoxy adhesive in above-mentioned nd-fe-b permanent magnetic alloy powder, content is 0.5-15%WT (WT is weight percentage)
4, in claim item 1 or 2 methods to ferrite-neodymium iron boron compoiste adhering permanent magnet in order to improve the surface treatment of its characteristic strength.
The characteristic component of magnet is: a. nd-fe-b permanent magnetic alloy powder 50-95%WT.
B. strontium ferrites or barium ferrite powder 5-50%WT.
Sneak into epoxy adhesive in above-mentioned mixed powder, content is 1-15%WT.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99111568 CN1285420A (en) | 1999-08-18 | 1999-08-18 | Chemical nickel plating method for increasing mechanical strength of cohesive neodymium-ferro-boron permanent magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99111568 CN1285420A (en) | 1999-08-18 | 1999-08-18 | Chemical nickel plating method for increasing mechanical strength of cohesive neodymium-ferro-boron permanent magnet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1285420A true CN1285420A (en) | 2001-02-28 |
Family
ID=5275162
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99111568 Pending CN1285420A (en) | 1999-08-18 | 1999-08-18 | Chemical nickel plating method for increasing mechanical strength of cohesive neodymium-ferro-boron permanent magnet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1285420A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102108511A (en) * | 2010-12-24 | 2011-06-29 | 烟台正海磁性材料股份有限公司 | Electroplating and chemical plating composite protecting process for NdFeB permanent magnet and NdFeB permanent magnet with composite protective layer |
| CN102051605B (en) * | 2009-10-30 | 2012-07-04 | 海洋王照明科技股份有限公司 | Method for anti-corrosive surface treatment of aluminum or aluminum alloy product |
| CN102560445A (en) * | 2012-02-17 | 2012-07-11 | 湖南航天工业总公司 | Process for chemically and compositely plating nickel and phosphorus on sintered neodymium iron boron |
| CN104952582A (en) * | 2015-04-17 | 2015-09-30 | 南通万宝实业有限公司 | Novel permanently-magnetic material |
| CN105040004A (en) * | 2015-08-28 | 2015-11-11 | 安徽大地熊新材料股份有限公司 | Sintered Nd-Fe-B magnet surface coating technology |
| CN111041461A (en) * | 2019-12-09 | 2020-04-21 | 电子科技大学 | Method for chemically plating nickel on ferrite |
-
1999
- 1999-08-18 CN CN 99111568 patent/CN1285420A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102051605B (en) * | 2009-10-30 | 2012-07-04 | 海洋王照明科技股份有限公司 | Method for anti-corrosive surface treatment of aluminum or aluminum alloy product |
| CN102108511A (en) * | 2010-12-24 | 2011-06-29 | 烟台正海磁性材料股份有限公司 | Electroplating and chemical plating composite protecting process for NdFeB permanent magnet and NdFeB permanent magnet with composite protective layer |
| CN102560445A (en) * | 2012-02-17 | 2012-07-11 | 湖南航天工业总公司 | Process for chemically and compositely plating nickel and phosphorus on sintered neodymium iron boron |
| CN102560445B (en) * | 2012-02-17 | 2014-02-19 | 湖南航天工业总公司 | Process for chemically and compositely plating nickel and phosphorus on sintered neodymium iron boron |
| CN104952582A (en) * | 2015-04-17 | 2015-09-30 | 南通万宝实业有限公司 | Novel permanently-magnetic material |
| CN105040004A (en) * | 2015-08-28 | 2015-11-11 | 安徽大地熊新材料股份有限公司 | Sintered Nd-Fe-B magnet surface coating technology |
| CN111041461A (en) * | 2019-12-09 | 2020-04-21 | 电子科技大学 | Method for chemically plating nickel on ferrite |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |