CN103938241A - Method for enhancing corrosion resistance of NdFeB (Neodymium Iron Boron) permanent magnet - Google Patents
Method for enhancing corrosion resistance of NdFeB (Neodymium Iron Boron) permanent magnet Download PDFInfo
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- CN103938241A CN103938241A CN201410137539.1A CN201410137539A CN103938241A CN 103938241 A CN103938241 A CN 103938241A CN 201410137539 A CN201410137539 A CN 201410137539A CN 103938241 A CN103938241 A CN 103938241A
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- Prior art keywords
- permanent magnet
- antiseptic property
- layer
- enhancing
- metal nickel
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- 229910001172 neodymium magnet Inorganic materials 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 40
- 230000002708 enhancing effect Effects 0.000 title claims abstract description 28
- 230000007797 corrosion Effects 0.000 title abstract description 7
- 238000005260 corrosion Methods 0.000 title abstract description 7
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 title abstract 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 70
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000011248 coating agent Substances 0.000 claims abstract description 39
- 238000000576 coating method Methods 0.000 claims abstract description 39
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 32
- 229910052751 metal Inorganic materials 0.000 claims abstract description 21
- 239000002184 metal Substances 0.000 claims abstract description 21
- 230000008020 evaporation Effects 0.000 claims abstract description 18
- 238000001704 evaporation Methods 0.000 claims abstract description 18
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 17
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 8
- 238000007747 plating Methods 0.000 claims abstract description 7
- 238000009713 electroplating Methods 0.000 claims abstract description 6
- 230000002421 anti-septic effect Effects 0.000 claims description 35
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 10
- 238000002203 pretreatment Methods 0.000 claims description 10
- 238000004506 ultrasonic cleaning Methods 0.000 claims description 10
- 239000012528 membrane Substances 0.000 claims description 9
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 5
- 229960000935 dehydrated alcohol Drugs 0.000 claims description 5
- 238000005566 electron beam evaporation Methods 0.000 claims description 5
- 238000010894 electron beam technology Methods 0.000 claims description 5
- 239000003921 oil Substances 0.000 claims description 5
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 5
- 230000007613 environmental effect Effects 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 3
- 239000010408 film Substances 0.000 abstract 6
- 239000010409 thin film Substances 0.000 abstract 3
- 238000005238 degreasing Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 3
- 238000006253 efflorescence Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 206010037844 rash Diseases 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910052779 Neodymium Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000005518 electrochemistry Effects 0.000 description 1
- 238000004070 electrodeposition Methods 0.000 description 1
- 150000004678 hydrides Chemical class 0.000 description 1
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 230000002335 preservative effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
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- Hard Magnetic Materials (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
Abstract
The invention discloses a method for enhancing corrosion resistance of an NdFeB (Neodymium Iron Boron) permanent magnet. The method comprises the following steps: step 1, pretreatment, namely degreasing and rinsing the NdFeB permanent magnet; step 2, electroplating of a metal nickel film layer, namely plating a layer of metal nickel film on the surface of the NdFeB permanent magnet; and step 3, plating a layer of silicon dioxide thin film on the surface of the metal nickel film layer. Compared with the prior art, the method disclosed by the invention has the beneficial effects that firstly the metal nickel film layer is electroplated on the surface of the NdFeB permanent magnet, and then a layer of silicon dioxide thin film is plated on the surface of the nickel coating through an evaporation coating processing technology, so that the porosity of the film layer can be effectively reduced, the surface of the coating film becomes denser, the corrosion resistance of the NdFeB permanent magnet is obviously enhanced, meanwhile the thickness of the silicon dioxide thin film layer cannot significantly increase, so that the magnetic output of the NdFeB permanent magnet cannot be affected, and the effects of high safety and environmental friendliness are achieved in the production process, thus national environmental protection requirements are met.
Description
Technical field
The invention belongs to the technical field of surface of material, relate to a kind of method that strengthens Nd-Fe-B permanent magnet antiseptic property.
Background technology
The advantage of ndfeb magnet is that cost performance is high, the mechanical characteristics that tool is good; Weak point is that Curie point is low, and temperature profile is poor, and is easy to efflorescence corrosion, must, by adjusting its chemical composition and taking surface treatment method to make it to be improved, just can reach the requirement of practical application.
Neodymium in Nd-Fe-B permanent magnet is a kind of rare earth element, and chemically reactive is very strong, and easily oxidized in air, solidity to corrosion is poor, and in Nd-Fe-Bo permanent magnet material rich B phase, rich Nd phase, Nd
2fe
14the electrochemical potential of B phase is different, and rich Nd phase and rich B phase electropotential are lower than matrix Nd
2fe
14b phase forms electrochemistry microbattery in damp and hot environment, and first rich Nd phase and rich B are corroded mutually, and when serious, the oxide compound and the hydride that produce a large amount of Nd make material efflorescence, thereby cause the degradation of magnet.So general all preservative coats on the plated surface of Nd-Fe-B permanent magnet.Coating for protection against corrosion on Nd-Fe-B permanent magnet is nickel coating mostly, and nickel coating is cathodic electrodeposition coating, and without electro-chemical protection, in the time that coating exists hole, first matrix can be corroded, thereby only has coating just to play a protective role the in the situation that of dense non-porous.Coating is thinner, and porosity is just higher, ensure the non-corrosibility of nickel coating, more than generally coating will reach 20um.But the too thick magnetic output that can shield Nd-Fe-B permanent magnet of metallic nickel rete, affects its result of use.
Summary of the invention
The problems referred to above that the present invention need to solve are thin for above-mentioned prior art coating, and porosity is high, and non-corrosibility is poor; The thick magnetic output that can shield Nd-Fe-B permanent magnet of coating, affects the deficiency of its result of use, and the method for the enhancing Nd-Fe-B permanent magnet antiseptic property that a kind of coating is thin and Corrosion Protection is strong is provided.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
A method that strengthens Nd-Fe-B permanent magnet antiseptic property, comprises the following steps:
The first step: pre-treatment, Nd-Fe-B permanent magnet is carried out to oil removing, rinsing;
Second step: plated metal nickel rete, plates layer of metal nickel rete at surface of Nd-Fe-B permanent magnet;
The 3rd step: plate again layer of silicon dioxide film at metallic nickel film surface.
The method of described enhancing Nd-Fe-B permanent magnet antiseptic property, the complete processing of pre-treatment is, first uses acetone soln ultrasonic cleaning Nd-Fe-B permanent magnet 20 minutes-25 minutes, uses dehydrated alcohol ultrasonic cleaning 10 minutes-15 minutes after taking-up again, dries up for subsequent use.
The method of described enhancing Nd-Fe-B permanent magnet antiseptic property, the complete processing of plated metal nickel rete is, cleaned Nd-Fe-B permanent magnet is placed among nickel plating solution, is: 45 DEG C-55 DEG C in temperature, under the condition of pH=4.0-5.0, carry out electronickelling, current density is 1A/dm
2-1.2A/dm
2, electroplating time is 30min-45min.
The method of described enhancing Nd-Fe-B permanent magnet antiseptic property, the complete processing that applying silicon oxide film adopts is evaporation coating.
The method of described enhancing Nd-Fe-B permanent magnet antiseptic property, described evaporation coating complete processing is, and with vacuum electron beam evaporation coating machine, the temperature of Nd-Fe-B permanent magnet is controlled at 220 DEG C-250 DEG C, and vacuum keep is 6.67 × 10
-3pa-1.07 × 10
-2pa, the bombarding current of electron beam gun is controlled between 4.0A-4.5A, and intensifying ring voltage 3000V-3200V carries out evaporation coating 20 seconds-25 seconds with this understanding.
The method of described enhancing Nd-Fe-B permanent magnet antiseptic property, the thickness of described silica membrane layer is 50nm-80nm.
Compared with prior art, the invention has the beneficial effects as follows: first at surface of Nd-Fe-B permanent magnet plated metal nickel rete, the complete processing of passing through evaporation coating is again at nickel coating plated surface last layer silica membrane, can effectively reduce rete porosity, make the surface of plated film become fine and close, obviously strengthen the antiseptic property of Nd-Fe-B permanent magnet, the thickness of silica membrane layer can obviously not increase simultaneously, can not affect its magnetic output, and safety and environmental protection in the process of producing, meets national environmental requirement.
Embodiment
Describe the preferred technical solution of the present invention below in detail.
embodiment 1
A method that strengthens Nd-Fe-B permanent magnet antiseptic property, comprises the following steps:
The first step: pre-treatment, Nd-Fe-B permanent magnet is carried out to oil removing, rinsing;
Second step: plated metal nickel rete, plates layer of metal nickel rete at surface of Nd-Fe-B permanent magnet;
The 3rd step: plate again layer of silicon dioxide film at metallic nickel film surface.
The method of described enhancing Nd-Fe-B permanent magnet antiseptic property, the complete processing of pre-treatment is, first uses acetone soln ultrasonic cleaning Nd-Fe-B permanent magnet 20 minutes, uses dehydrated alcohol ultrasonic cleaning 10 minutes after taking-up again, dries up for subsequent use.
The method of described enhancing Nd-Fe-B permanent magnet antiseptic property, the complete processing of plated metal nickel rete is, cleaned Nd-Fe-B permanent magnet is placed among nickel plating solution, in temperature is: 50 DEG C, under the condition of pH=4.5, carry out electronickelling, current density is 1A/dm
2, electroplating time is 30min.
The method of described enhancing Nd-Fe-B permanent magnet antiseptic property, the complete processing that applying silicon oxide film adopts is evaporation coating.
The method of described enhancing Nd-Fe-B permanent magnet antiseptic property, described evaporation coating complete processing is, and with vacuum electron beam evaporation coating machine, the temperature of Nd-Fe-B permanent magnet is controlled at 220 DEG C, and vacuum keep is 8 × 10
-3pa, the bombarding current of electron beam gun is controlled between 4.0A, and intensifying ring voltage 3000V carries out evaporation coating 20 seconds with this understanding.
The method of described enhancing Nd-Fe-B permanent magnet antiseptic property, the thickness of described silica membrane layer is 50nm, thicknesses of layers is thinner, can not affect the magnetic output of Nd-Fe-B permanent magnet.
embodiment 2
A method that strengthens Nd-Fe-B permanent magnet antiseptic property, comprises the following steps:
The first step: pre-treatment, Nd-Fe-B permanent magnet is carried out to oil removing, rinsing;
Second step: plated metal nickel rete, plates layer of metal nickel rete at surface of Nd-Fe-B permanent magnet;
The 3rd step: plate again layer of silicon dioxide film at metallic nickel film surface.
The method of described enhancing Nd-Fe-B permanent magnet antiseptic property, the complete processing of pre-treatment is, first uses acetone soln ultrasonic cleaning Nd-Fe-B permanent magnet 20 minutes, uses dehydrated alcohol ultrasonic cleaning 15 minutes after taking-up again, dries up for subsequent use.
The method of described enhancing Nd-Fe-B permanent magnet antiseptic property, the complete processing of plated metal nickel rete is, cleaned Nd-Fe-B permanent magnet is placed among nickel plating solution, in temperature is: 48 DEG C, under the condition of pH=4.3, carry out electronickelling, current density is 1A/dm
2, electroplating time is 35min.
The method of described enhancing Nd-Fe-B permanent magnet antiseptic property, the complete processing that applying silicon oxide film adopts is evaporation coating.
The method of described enhancing Nd-Fe-B permanent magnet antiseptic property, described evaporation coating complete processing is, and with vacuum electron beam evaporation coating machine, the temperature of Nd-Fe-B permanent magnet is controlled at 220 DEG C, and vacuum keep is 1.0 × 10
-2pa, the bombarding current of electron beam gun is controlled between 4.5A, and intensifying ring voltage 3100V carries out evaporation coating 25 seconds with this understanding.
The method of described enhancing Nd-Fe-B permanent magnet antiseptic property, the thickness of described silica membrane layer is 80nm, thicknesses of layers is thinner, can not affect the magnetic output of Nd-Fe-B permanent magnet.
embodiment 3
A method that strengthens Nd-Fe-B permanent magnet antiseptic property, comprises the following steps:
The first step: pre-treatment, Nd-Fe-B permanent magnet is carried out to oil removing, rinsing;
Second step: plated metal nickel rete, plates layer of metal nickel rete at surface of Nd-Fe-B permanent magnet;
The 3rd step: plate again layer of silicon dioxide film at metallic nickel film surface.
The method of described enhancing Nd-Fe-B permanent magnet antiseptic property, the complete processing of pre-treatment is, first uses acetone soln ultrasonic cleaning Nd-Fe-B permanent magnet 25 minutes, uses dehydrated alcohol ultrasonic cleaning 15 minutes after taking-up again, dries up for subsequent use.
The method of described enhancing Nd-Fe-B permanent magnet antiseptic property, the complete processing of plated metal nickel rete is, cleaned Nd-Fe-B permanent magnet is placed among nickel plating solution, is: 53 DEG C in temperature, under the condition of pH=4.6, carry out electronickelling, current density is 1.1A/dm
2, electroplating time is 40min.
The method of described enhancing Nd-Fe-B permanent magnet antiseptic property, the complete processing that applying silicon oxide film adopts is evaporation coating.
The method of described enhancing Nd-Fe-B permanent magnet antiseptic property, described evaporation coating complete processing is, and with vacuum electron beam evaporation coating machine, the temperature of Nd-Fe-B permanent magnet is controlled at 250 DEG C, and vacuum keep is 7.15 × 10
-3pa, the bombarding current of electron beam gun is controlled between 4.0A, and intensifying ring voltage 3000V carries out evaporation coating 23 seconds with this understanding.
The method of described enhancing Nd-Fe-B permanent magnet antiseptic property, the thickness of described silica membrane layer is 60nm, thicknesses of layers is thinner, can not affect the magnetic output of Nd-Fe-B permanent magnet.
Compared with prior art, the invention has the beneficial effects as follows: first at surface of Nd-Fe-B permanent magnet plated metal nickel rete, the complete processing of passing through evaporation coating is again at nickel coating plated surface last layer silica membrane, can effectively reduce rete porosity, make the surface of plated film become fine and close, obviously strengthen the antiseptic property of Nd-Fe-B permanent magnet, the thickness of silica membrane layer can obviously not increase simultaneously, can not affect its magnetic output, and safety and environmental protection in the process of producing, meets national environmental requirement.
Above concrete embodiment only can be served as reference of the present invention instead of limitation of the present invention.
Claims (6)
1. a method that strengthens Nd-Fe-B permanent magnet antiseptic property, is characterized in that: comprise the following steps:
The first step: pre-treatment, Nd-Fe-B permanent magnet is carried out to oil removing, rinsing;
Second step: plated metal nickel rete, plates layer of metal nickel rete at surface of Nd-Fe-B permanent magnet;
The 3rd step: plate again layer of silicon dioxide film at metallic nickel film surface.
2. the method for enhancing Nd-Fe-B permanent magnet antiseptic property according to claim 1, it is characterized in that: the complete processing of pre-treatment is, first use acetone soln ultrasonic cleaning Nd-Fe-B permanent magnet 20 minutes-25 minutes, after taking-up, use again dehydrated alcohol ultrasonic cleaning 10 minutes-15 minutes, dry up for subsequent use.
3. the method for enhancing Nd-Fe-B permanent magnet antiseptic property according to claim 1, it is characterized in that: the complete processing of plated metal nickel rete is, cleaned Nd-Fe-B permanent magnet is placed among nickel plating solution, in temperature be: 45 DEG C-55 DEG C, under the condition of pH=4.0-5.0, carry out electronickelling, current density is 1A/dm
2-1.2A/dm
2, electroplating time is 30min-45min.
4. the method for enhancing Nd-Fe-B permanent magnet antiseptic property according to claim 1, is characterized in that: the complete processing that applying silicon oxide film adopts is evaporation coating.
5. the method for enhancing Nd-Fe-B permanent magnet antiseptic property according to claim 4, it is characterized in that: described evaporation coating complete processing is, with vacuum electron beam evaporation coating machine, the temperature of Nd-Fe-B permanent magnet is controlled at 220 DEG C-250 DEG C, and vacuum keep is 6.67 × 10
-3pa-1.07 × 10
-2pa, the bombarding current of electron beam gun is controlled between 4.0A-4.5A, and intensifying ring voltage 3000V-3200V carries out evaporation coating 20 seconds-25 seconds with this understanding.
6. the method for enhancing Nd-Fe-B permanent magnet antiseptic property according to claim 1, is characterized in that: the thickness of described silica membrane layer is 50nm-80nm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410137539.1A CN103938241B (en) | 2014-04-08 | 2014-04-08 | A kind of method strengthening Nd-Fe-B permanent magnet antiseptic property |
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|---|---|---|---|
| CN201410137539.1A CN103938241B (en) | 2014-04-08 | 2014-04-08 | A kind of method strengthening Nd-Fe-B permanent magnet antiseptic property |
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| CN103938241A true CN103938241A (en) | 2014-07-23 |
| CN103938241B CN103938241B (en) | 2016-06-29 |
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| CN201410137539.1A Expired - Fee Related CN103938241B (en) | 2014-04-08 | 2014-04-08 | A kind of method strengthening Nd-Fe-B permanent magnet antiseptic property |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110093646A (en) * | 2019-04-26 | 2019-08-06 | 厦门建霖健康家居股份有限公司 | A kind of electro-plating method of magnetic structure |
| CN110983333A (en) * | 2019-12-06 | 2020-04-10 | 东莞中探探针有限公司 | Neodymium-iron-boron composite coating and preparation method and application thereof |
| CN113718251A (en) * | 2021-08-25 | 2021-11-30 | 深圳市金源康实业有限公司 | Plastic surface coating structure and preparation method thereof |
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| Publication number | Publication date |
|---|---|
| CN103938241B (en) | 2016-06-29 |
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