CN109208048A - Coating structure of Sintered NdFeB magnet and preparation method thereof - Google Patents

Coating structure of Sintered NdFeB magnet and preparation method thereof Download PDF

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Publication number
CN109208048A
CN109208048A CN201810898948.1A CN201810898948A CN109208048A CN 109208048 A CN109208048 A CN 109208048A CN 201810898948 A CN201810898948 A CN 201810898948A CN 109208048 A CN109208048 A CN 109208048A
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China
Prior art keywords
sintered ndfeb
zinc
ndfeb magnet
coating
layer
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CN201810898948.1A
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Chinese (zh)
Inventor
郝志平
罗赣
白兰
罗霆
孙元波
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BEIJING MAIGELONG TECHNOLOGY Co Ltd
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BEIJING MAIGELONG TECHNOLOGY Co Ltd
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Priority to CN201810898948.1A priority Critical patent/CN109208048A/en
Publication of CN109208048A publication Critical patent/CN109208048A/en
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    • CCHEMISTRY; METALLURGY
    • C25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25DPROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/10Electroplating with more than one layer of the same or of different metals
    • CCHEMISTRY; METALLURGY
    • C25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25DPROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D3/00Electroplating: Baths therefor
    • C25D3/02Electroplating: Baths therefor from solutions
    • C25D3/22Electroplating: Baths therefor from solutions of zinc
    • CCHEMISTRY; METALLURGY
    • C25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25DPROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D3/00Electroplating: Baths therefor
    • C25D3/02Electroplating: Baths therefor from solutions
    • C25D3/56Electroplating: Baths therefor from solutions of alloys
    • CCHEMISTRY; METALLURGY
    • C25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25DPROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/48After-treatment of electroplated surfaces

Abstract

This application provides coating structure of a kind of Sintered NdFeB magnet and preparation method thereof, the coating structure of the Sintered NdFeB magnet includes: the zinc layers directly contacted with Sintered NdFeB magnet;And the zinc-nickel alloy layer in zinc layers.Coating structure provided by the present application avoids the coating magnet short-cut path of traditional nickel layer bottoming and the generation of hydrogen-type corrosion phenomenon by zinc layers bottoming, to reduce the hot demagnetizing factor of Sintered NdFeB magnet;Meanwhile zinc layers and zinc-nickel alloy layer together constitute anodic coating, effectively increase the corrosion resistance of Sintered NdFeB magnet.

Description

Coating structure of Sintered NdFeB magnet and preparation method thereof
Technical field
The invention belongs to electromagnetic arts, more particularly, to the coating structure and preparation method thereof of Sintered NdFeB magnet.
Background technique
In sintered NdFeB industry, ambrose alloy nickel, nickel nickel or blue white zine electroplated layer structure are generallyd use.Ambrose alloy nickel or nickel Nickel coating be all with nickel coating bottoming, for the ultrathin small magnet extremely low for unit permeance PC value, the magnetic of nickel coating bottoming Its hot demagnetizing factor obviously increases body, initial magnetic flux is decreased obviously compared with the magnet before zinc layers bottoming or plating, this is greatly Affect the miniaturized application of electronic device.
The hot demagnetizing factor of electro-galvanized layer magnet is although lower, but its corrosion resistance is very poor, for example individual handset user is just It deeply hurts, individual handset is using there is voice distortion after 1 year or mobile phone falls on the ground rear earphone or receiver Equal acoustical devices just lose phonetic function, find that the zinc coating on magnet has overgrowed with white rust after dismantling mobile phone device, or Person has fallen off.The problem of poor corrosion resistance, perplexs always many well-known mobile-phone manufacturers.Hot demagnetizing factor is higher simultaneously, plates Layer the problem of binding force is relatively low and higher cost always Nd-Fe-B permanent magnetic industry a challenge.
Summary of the invention
In view of the above problems, this application provides a kind of low-heat demagnetizing factor, highly corrosion resistant, high-bond and low costs The coating structure of coating structure, the Sintered NdFeB magnet uses zinc layers bottoming, significantly reduces the heat of Sintered NdFeB magnet Demagnetizing factor;By zinc layers and zinc-nickel alloy layer collective effect, the corrosion resistance of Sintered NdFeB magnet is improved;In addition, zinc-nickel closes Passivation layer in layer gold provides protection as surface layer for Sintered NdFeB magnet, further improves the resistance to of Sintered NdFeB magnet Corrosivity.
This application provides a kind of coating structures of Sintered NdFeB magnet characterized by comprising
Zinc layers are directly contacted with Sintered NdFeB magnet;And
Zinc-nickel alloy layer is located in zinc layers.
In the coating structure of above-mentioned Sintered NdFeB magnet, further includes: passivation layer is formed on zinc-nickel alloy layer.
In the coating structure of above-mentioned Sintered NdFeB magnet, the thickness of the zinc layers is between 1~10 μm.
In the coating structure of above-mentioned Sintered NdFeB magnet, the thickness of the zinc-nickel alloy layer is between 2~8 μm.
Present invention also provides a kind of methods of coating structure for preparing Sintered NdFeB magnet, comprising: in sintering neodymium iron Zinc layers are formed on boron magnet;And zinc-nickel alloy layer is formed in zinc layers.
In the above-mentioned methods, further includes: passivation layer is formed on zinc-nickel alloy layer.
In the above-mentioned methods, the thickness of the zinc layers is between 1~10 μm.
In the above-mentioned methods, the thickness of the zinc-nickel alloy layer is between 2~8 μm.
In this application, the coating magnet short-cut path and hydrogen-type corrosion phenomenon of traditional nickel layer bottoming are avoided by zinc layers bottoming Occur, to reduce the hot demagnetizing factor of Sintered NdFeB magnet;Meanwhile zinc layers and zinc-nickel alloy layer together constitute positive polarity Coating effectively increases the corrosion resistance of Sintered NdFeB magnet.The Sintered NdFeB magnet that the coating of the application is coated Hot demagnetizing factor than the hot demagnetizing factor for the Sintered NdFeB magnet that traditional ambrose alloy nickel or nickel coating are coated lower 40~70%, Binding force of cladding material is 2~4 times higher than the binding force of ambrose alloy nickel coating, and by salt spray test it can be found that the coating of the application The salt spray test of the Sintered NdFeB magnet coated improves 2 than the Sintered NdFeB magnet that simple zinc coating is coated~ 6 times, improve the corrosion resistance of Sintered NdFeB magnet;In addition, the present invention is to product specification in PC value < 0.3 or orientation side It has a significant effect to the reduced rate of the hot demagnetizing factor of thickness < 2mm magnet, the reduced rate of the smaller hot demagnetizing factor of PC value is brighter It is aobvious;Moreover, the electroplating cost of the coating structure of the application is 2/3rds of the electroplating cost of ambrose alloy nickel coating.
Detailed description of the invention
Fig. 1 shows the schematic diagram of the coating structure of Sintered NdFeB magnet.
Specific embodiment
The following examples can make those skilled in the art that the present invention be more fully understood, but not limit in any way The present invention.
As shown in Figure 1, the coating structure includes cladding this application provides a kind of coating structure of Sintered NdFeB magnet Zinc layers 2 on Sintered NdFeB magnet 1;And it is coated on the zinc-nickel alloy layer 3 in zinc layers.
In some embodiments, zinc layers bottoming avoids the coating magnet short-cut path and hydrogen-type corrosion phenomenon of traditional nickel layer bottoming Occur, to reduce the hot demagnetizing factor of Sintered NdFeB magnet;Meanwhile zinc layers and zinc-nickel alloy layer together constitute positive polarity Coating effectively increases the corrosion resistance of Sintered NdFeB magnet.
In some embodiments, the coating structure of Sintered NdFeB magnet further include: the passivated production on zinc-nickel alloy layer The passivation layer 4 of raw grey, blue or black is used as surface layer, to protect Sintered NdFeB magnet.
In some embodiments, the thickness of zinc layers, if zinc layers are too thin (less than 1 μm), cannot have between 1~10 μm Effect reduces hot demagnetizing factor;If zinc layers are blocked up (being greater than 10 μm), the use of knot neodymium iron boron magnetic body may be negatively affected.
In some embodiments, the thickness of zinc-nickel alloy layer is between 2~8 μm, if zinc-nickel alloy layer is too thin (less than 2 μ M), then cannot with zinc layers collective effect, and then improve Sintered NdFeB magnet corrosion resistance;If zinc-nickel alloy layer is blocked up (being greater than 8 μm), then it may negatively affect the use of knot neodymium iron boron magnetic body.
In addition, the present invention is to product specification in the hot demagnetizing factor of PC value < 0.3 or differently- oriented directivity thickness < 2mm magnet Reduced rate has a significant effect, and the reduced rate of the smaller hot demagnetizing factor of PC value is more obvious.
Present invention also provides a kind of methods of coating structure for forming Sintered NdFeB magnet, including, in sintering neodymium iron One layer of zinc layers 2 are electroplated on boron magnet 1.One layer of zinc-nickel alloy layer 3 is electroplated in zinc layers 2;Later, this method further includes closing in zinc-nickel One layer of passivation layer 4 is passivated using passivating solution (such as trivalent chromium deactivating liquid) in layer gold 3, after (70~100 DEG C) of high temperature solidifications, passivation Layer 4 is used as surface layer, to protect Sintered NdFeB magnet.
Embodiment 1
Using the Sintered NdFeB magnet of 9.90*3.40*0.80, preceding place can be carried out to Sintered NdFeB magnet 1 first Reason, including chamfering commonly used in the art, oil removing, pickling, ultrasonic wave water washing etc..Then the electroplate liquid for using electrogalvanizing, is burning Tie the zinc layers 2 that one layer of 1 μ m-thick is electroplated on neodymium iron boron magnetic body 1.Zinc layers 2 are prime coat, in zinc layers 2, using Zinc-nickel alloy electroplating The zinc-nickel alloy layer 3 of one layer of 2 μ m-thick is electroplated in liquid, on zinc-nickel alloy layer 3, is passivated one layer of passivation layer 4 using trivalent chromium deactivating liquid, After hot setting, passivation layer 4 is used as surface layer.
Embodiment 2
Using the Sintered NdFeB magnet of 9.90*3.40*0.80, preceding place can be carried out to Sintered NdFeB magnet 1 first Reason, including chamfering commonly used in the art, oil removing, pickling, ultrasonic wave water washing etc..Then the electroplate liquid for using electrogalvanizing, is burning Tie the zinc layers 2 that one layer of 5 μ m-thick is electroplated on neodymium iron boron magnetic body 1.Zinc layers 2 are prime coat, in zinc layers 2, using Zinc-nickel alloy electroplating The zinc-nickel alloy layer 3 of one layer of 4 μ m-thick is electroplated in liquid, on zinc-nickel alloy layer 3, is passivated one layer of passivation layer 4 using trivalent chromium deactivating liquid, After hot setting, passivation layer 4 is used as surface layer.
Embodiment 3
Using the Sintered NdFeB magnet of 9.90*3.40*0.80, preceding place can be carried out to Sintered NdFeB magnet 1 first Reason, including chamfering commonly used in the art, oil removing, pickling, ultrasonic wave water washing etc..Then the electroplate liquid for using electrogalvanizing, is burning Tie the zinc layers 2 that one layer of 10 μ m-thick is electroplated on neodymium iron boron magnetic body 1.Zinc layers 2 are prime coat, in zinc layers 2, using Zinc-nickel alloy electroplating The zinc-nickel alloy layer 3 of one layer of 8 μ m-thick is electroplated in liquid, on zinc-nickel alloy layer 3, is passivated one layer of passivation layer 4 using trivalent chromium deactivating liquid, After hot setting, passivation layer 4 is used as surface layer.
Comparative example 1
Using the Sintered NdFeB magnet of 9.90*3.40*0.80, pre-treatment, packet are carried out to Sintered NdFeB magnet first Include chamfering commonly used in the art, oil removing, pickling, ultrasonic wave water washing etc..Then the electroplate liquid for using electronickelling, in sintering neodymium iron The nickel layer of one layer of 1 μ m-thick is electroplated on boron magnet.On nickel layer, using the electroplate liquid of electro-coppering, one layer of 2 μ m-thick is electroplated on nickel layer Layers of copper using the electroplate liquid of electronickelling again, the nickel layer of one layer of 1 μ m-thick is electroplated in layers of copper, in sintered NdFeB magnetic later The coating structure of ambrose alloy nickel is formed on body.
Comparative example 2
Using the Sintered NdFeB magnet of 9.90*3.40*0.80, pre-treatment, packet are carried out to Sintered NdFeB magnet first Include chamfering commonly used in the art, oil removing, pickling, ultrasonic wave water washing etc..Then the electroplate liquid for using electrogalvanizing, in sintering neodymium iron The zinc layers of one layer of 1 μ m-thick are electroplated on boron magnet.
Later, there are the hot demagnetizing factor of carry out, the coating knot of coating structure magnet to the formation that embodiment 1 and comparative example 1 obtain Resultant force is tested.
Hot demagnetizing factor test: preparation sample, saturation, which magnetize, room temperature measures sample flux value, are sticked to plater loads onto, is put into In drying box, heats up and keep the temperature to 120 DEG C of * 2Hr, be cooled to room temperature, measurement sample magnetic flux, the hot demagnetizing factor of calculating.
Binding force of cladding material test: prepare sample, prepare special glue, prepare thrust working plate, prepare thrust meter, gluing, scrape Plate, drying, cooling, is put into thrust tooling platform, breaks sample, record thrust force value, observe coating, determine fixed sample, no Fall coating for qualification.
Test result see the table below 1:
Table 1
Embodiment 1 Embodiment 2 Embodiment 3 Comparative example 1
Hot demagnetizing factor 2.1% 2.3% 2.5% 9.8%
Binding force of cladding material 195N 210N 215N 95N
There is the magnet of coating structure to carry out salt spray test test the formation that embodiment 1 to 3 and comparative example 2 obtain.
Salt spray test: prepare sample, be put into salt spray test chamber, 5%NaCl neutral aqueous solution, 35 DEG C of temperature, it is continuous spraying, Every 24Hr observe a sample appearance, determine, coating non-corroding, without be bubbled, without cracking etc. open defects be qualification.
Test result see the table below 2:
Table 2
Embodiment 1 Embodiment 2 Embodiment 3 Comparative example 2
Salt spray test 48Hr 110Hr 168Hr 24Hr
By upper table 1 as can be seen that the application avoids the coating magnet short-cut path of traditional nickel layer bottoming by zinc layers bottoming With the generation of hydrogen-type corrosion phenomenon, to reduce the hot demagnetizing factor of Sintered NdFeB magnet, the coating of the application is coated super The heat for the Sintered NdFeB magnet that the hot demagnetizing factor of slim Sintered NdFeB magnet and traditional ambrose alloy nickel coating are coated subtracts magnetic Rate is compared, hence it is evident that is reduced, under the conditions of identical 120 DEG C of * 2Hr demagnetization, the ultrathin type that the coating of the application is coated is sintered neodymium The hot demagnetizing factor of iron boron magnet is 2.1%~2.5%, and the hot demagnetizing factor for the Sintered NdFeB magnet that ambrose alloy nickel coating is coated It is 9.8%.
Protection is provided for Sintered NdFeB magnet as surface layer by the passivation layer on zinc-nickel alloy layer, is further improved The corrosion resistance of ultrathin Sintered NdFeB magnet, and the binding force of the coating structure is improved, pass through the coating knot in table 1 The binding force that resultant force can be seen that coating structure provided by the present application is 2~4 times higher than the binding force of ambrose alloy Structure of Electroplating coat of Ni, Under identical thrust machine condition, the binding force of the coating structure of the application is 195N~215N, and ambrose alloy Structure of Electroplating coat of Ni Binding force is 95N.
As can be seen from Table 2, zinc layers and zinc-nickel alloy layer together constitute anodic coating, effectively increase sintering neodymium The corrosion resistance of iron boron magnet, by salt spray test it can be found that the ultrathin sintered NdFeB that the coating of the application is coated Magnet improves 4~6 times than the Sintered NdFeB magnet that simple zinc coating is coated, under the conditions of identical salt spray test, The salt spray test for the ultrathin Sintered NdFeB magnet that the coating of the application is coated has reached 48Hr~168Hr, and zinc coating The salt spray test of the Sintered NdFeB magnet coated is usually 24Hr, improves 2~6 times.
In addition, about 107 yuan/Kg of the price of metallic nickel, and the price of metallic zinc is 31.7 yuan/Kg, therefore, the application provides Coating structure electroplating cost be ambrose alloy Structure of Electroplating coat of Ni electroplating cost about 2/3rds.
To sum up, the hot demagnetizing factor for the Sintered NdFeB magnet that the coating of the application is coated is than traditional ambrose alloy nickel or nickel The hot demagnetizing factor for the Sintered NdFeB magnet that coating is coated low 40~70%, combination of the binding force of cladding material than ambrose alloy nickel coating Power is 2~4 times high, and by salt spray test it can be found that the salt fog for the Sintered NdFeB magnet that the coating of the application is coated Test improves 2~6 times than the Sintered NdFeB magnet that simple zinc coating is coated;In addition, the coating structure of the application Electroplating cost is about 2/3rds of the electroplating cost of ambrose alloy nickel coating.
It will be understood by those skilled in the art that above embodiments are only exemplary embodiments, without departing substantially from spirit of the invention In the case where range, a variety of variations can be carried out, replaced and changed.

Claims (8)

1. a kind of coating structure of Sintered NdFeB magnet characterized by comprising
Zinc layers are directly contacted with the Sintered NdFeB magnet;And
Zinc-nickel alloy layer is located in the zinc layers.
2. the coating structure of Sintered NdFeB magnet according to claim 1, which is characterized in that further include: passivation layer, shape At on the zinc-nickel alloy layer.
3. the coating structure of Sintered NdFeB magnet according to claim 1, which is characterized in that the thickness of the zinc layers exists Between 1~10 μm.
4. the coating structure of Sintered NdFeB magnet according to claim 1, which is characterized in that the zinc-nickel alloy layer Thickness is between 2~8 μm.
5. a kind of method for the coating structure for preparing Sintered NdFeB magnet characterized by comprising
Zinc layers are formed on Sintered NdFeB magnet;And
Zinc-nickel alloy layer is formed in the zinc layers.
6. according to the method described in claim 5, it is characterized by further comprising:
Passivation layer is formed on the zinc-nickel alloy layer.
7. according to the method described in claim 5, it is characterized in that, the thickness of the zinc layers is between 1~10 μm.
8. according to the method described in claim 5, it is characterized in that, the thickness of the zinc-nickel alloy layer is between 2~8 μm.
CN201810898948.1A 2018-08-08 2018-08-08 Coating structure of Sintered NdFeB magnet and preparation method thereof Withdrawn CN109208048A (en)

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* Cited by examiner, † Cited by third party
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CN113322465A (en) * 2021-07-05 2021-08-31 包头麦戈龙科技有限公司 Low-magnetic-attenuation and high-corrosion-resistance electroplated layer structure and preparation method thereof

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CN106968003A (en) * 2017-03-03 2017-07-21 陈治 Nd-Fe-B magnet steel overlay coating method
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113322465A (en) * 2021-07-05 2021-08-31 包头麦戈龙科技有限公司 Low-magnetic-attenuation and high-corrosion-resistance electroplated layer structure and preparation method thereof

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Application publication date: 20190115