CN1690255A - Method for preparing neodymium-iron-boron magnetic powder coated with metal layer by electrochemical deposition - Google Patents
Method for preparing neodymium-iron-boron magnetic powder coated with metal layer by electrochemical deposition Download PDFInfo
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Abstract
The invention provides a method for electrochemical deposition cladding metal sheet of Nd-Fe-B magnetic particle, that is: electrodeposition solution containing metallic ion in electrolyser, laying the degreased and activated Nd-Fe-B magnetic particle on the conductive negative plate, the metallic plate corresponding to the related electrodeposition solution as the anode, galvanizing in a cathode current density of 0.1 to 5 A/dm2 and a temperature of 10 to 50 Deg. C to make the surface of Nd-Fe-B magnetic particle coat sheet metal, separating and purifying, then the Nd-Fe-B magnetic particle the surface of which is coated with sheet metal prepared. The invention has a characteristic of modifying the surface of magnetic particle in a low temperature, increasing largely the corrosion electric potential, and advanced the magnetic property, oxidation resistance property and conductivity. With electrochemical deposition technology, the technique of coating sheet metal is simple, and the thickness of metal cladding can be controlled randomly.
Description
(1) technical field
The present invention relates to a kind of method of utilizing electrochemical deposition technique at rare earth permanent-magnet powder NdFeB magnetic powder surface clad layer, belong to the metal-powder technical field of surface.
(2) background technology
Neodymium iron boron is a kind of magneticsubstance that had good magnetic property modern age, and can pick up object volume after it magnetizes is the steel part more than 600 times of own vol, has obtained a large amount of application.Because the NdFeB material corrosion potential is too low, is easy to galvanic corrosion takes place and reduces its performance.Therefore for characteristics such as the oxidation-resistance of improving NdFeB magnetic powder and magnetic properties, all the time, people are devoted to by different surface treatment methods modification to be carried out on the NdFeB magnetic powder surface.
Zhang Yinglan proposes with sol-gel and rotation paint-on technique the NdFeB magnetic powder surface to be coated silicone resin to improve antioxidant property (Zhang Yinglan, NdFeB magnetic surface coats the research of silicone resin oxygen-proof property, Jilin University's natural science journal, 1996, Vol.8No.3,83-86), (Meng Yan such as the Meng Yan of Shanghai Communications University, Cao Lijun, Yang Yuan is firm etc., the cladding process on quick-quenching Nd-Fe-B magnetic surface, Shanghai Communications University's journal, 2002, Vol.36No.1,55-58) and the Liu Ying of Chengdu Univ. of Science ﹠ Technology etc. (Liu Ying is coated with an inscription ancient type of banner hoisted on a featherdecked mast, Mao Xianzhong, surface treatment is to the Study of Antioxidation of Agglutinate neodymium-iron-boron permanent magnetism, Chengdu Univ. of Science ﹠ Technology's journal, 1995,1:57-59) adopt the dichromate passivation technology respectively, the silane couplent cladding process, dichromate passivation reducing process and dichromate passivation reduction-silane superpacket coating process carry out surface modification with anti-oxidation research to NdFeB magnetic powder.The common ground that these methods adopt all is to coat non-metallic layer on the NdFeB magnetic powder surface, and this unavoidably will reduce magnetic property, and some technology is under comparatively high temps modification to be carried out on the magnetic surface, will deepen the oxidation of magnetic in technological process.
(3) summary of the invention
The NdFeB magnetic powder surface treatment makes the deficiency that magnetic magnetic reduces, oxidation is deepened in the prior art in order to solve, thereby the invention provides a kind of method of electrochemical deposition covered with metal layer that the NdFeB magnetic powder corrosion potential improves the magnetic magnetic property, improves the NdFeB magnetic powder of magnetic oxidation-resistance that improves greatly.
For reaching goal of the invention the technical solution used in the present invention be:
A kind of method of electrochemical deposition covered with metal layer of NdFeB magnetic powder, described method is: in the electrolyzer that fills the cationic electric depositing solution of containing metal, to place on the negative plate of conduction through the NdFeB magnetic powder of oil removing, activation pre-treatment, with the metal sheet with described electric depositing solution correspondence is anode, at cathode current density 0.1～5A/dm
2, under 10～50 ℃ of conditions of temperature, pass to electric current and the NdFeB magnetic powder surface coated go up metal level, obtain the NdFeB magnetic powder that the surface is coated with metal layer through purification procedures then.
For reaching covered effect preferably, the bottom land of electrolyzer applies vicissitudinous magnetic field, makes that NdFeB magnetic powder can paste negative plate in the electrodeposition process constantly to roll.Ratio of cathodic to anodic area is 1: 2～4.
Described metal is one of following:
1. nickel 2. copper 3. iron 4. zinc 5. tin 6. silver 7. the gold.
Described purification procedures is: magnetic is taken out with distilled water clean, do the solvent extraction dehydration with dehydrated alcohol then, 20 ℃～100 ℃ vacuum-dryings are after the NdFeB magnetic powder that hydrogen reducing obtains being coated with metal layer.
Described oil removing, activation pre-treatment step are:
(1) oil removing: with containing 5～20g/LNaOH, 5～20g/LNa
2CO
3, 5～10g/LNa
3PO
4, 0.008～0.05g/L Sodium dodecylbenzene sulfonate the thorough oil removing of solution;
(2) surface active: activate with dilute acid soln.Commonly used 3% hydrochloric acid soln activates.
Nickeliferous cationic electric depositing solution prescription is: NiSO
47H
2O 300g/L, NiCl6H
2O 40g/L, H
3BO
440g/L, sodium lauryl sulphate 0.1g/L.
The cationic electric depositing solution prescription of cupric is: CuCN 30g/L, NaCN 40g/L, Na
2CO
315g/L, Seignette salt 45g/L.
The cationic electric depositing solution prescription of iron content is: FeSO
47H
2O 280g/L, H
2SO
430g/L.
The electric depositing solution prescription that contains zinc cation is: NH
4Cl 260g/L, ZnCl
240g/L, H
3BO
330g/L.
The cationic electric depositing solution prescription of stanniferous is: SnCl
25g/L, NH
4Cl 240g/L, N (CH
2COOH)
3) 45g/L.
The cationic electric depositing solution prescription of argentiferous is:
AgNO
3?40g/L，Na
2S
2O
3·5H
2O?200g/L，K
2S
2O
5?40g/L。
Containing Jinyang ionic electric depositing solution prescription is: KAu (CN)
28g/L, KCN 20g/L, K
2CO
310g/L.
Especially, described electric depositing solution is filled a prescription when following: NiSO
47H
2O 300g/L, NiCl6H
2O 40g/L, H
3BO
440g/L, sodium lauryl sulphate 0.1g/L; Described method is carried out as follows:
(1) gets the pre-treatment that NdFeB magnetic powder carries out oil removing in 5 minutes, clear water rinsing, 1 minute surface active, clear water rinsing process;
(2) measure NiSO by prescription
47H
2O, NiCl6H
2O, H
3BO
4And sodium lauryl sulphate, being mixed with electric depositing solution with water dissolution and packing in the groove, stainless steel plate is positioned over bottom land and links to each other as negative electrode with the negative pole of power supply by lead-in wire, and the nickel plate hangs in the electric depositing solution as anode, and ratio of cathodic to anodic area is 1: 2;
(3) NdFeB magnetic powder after will handling is put into groove, and through precipitation after a while, NdFeB magnetic powder is tiled on the stainless steel plate, at 25 ℃, 1.5A/dm
2Condition under the electrodeposit metals nickel dam, move at bottom land with permanent magnet in the electrodeposition process;
After (4) 30 minutes, powered-down takes out magnetic with the distilled water cleaning, does the solvent extraction dehydration with dehydrated alcohol then, and is dry under 40 ℃ of conditions through putting into vacuum drying oven behind the suction filtration, after hydrogen reducing can obtain being coated with the NdFeB magnetic powder of nickel dam.
In addition, described electric depositing solution is filled a prescription when following: CuCN 30g/L, NaCN 40g/L, 15g/L, Seignette salt 45g/L; Described method is carried out as follows:
(1) gets the pre-treatment that NdFeB magnetic powder carries out oil removing in 5 minutes, clear water rinsing, 1 minute surface active, clear water rinsing process;
(2) measure CuCN, NaCN, Na by prescription
2CO
3And Seignette salt, being mixed with electric depositing solution with water dissolution and packing in the groove, stainless steel plate is positioned over bottom land and links to each other as negative electrode with the negative pole of power supply by lead-in wire, and copper coin hangs in the electric depositing solution as anode, and ratio of cathodic to anodic area is 1: 2;
(3) NdFeB magnetic powder after will handling is put into groove, and through precipitation after a while, NdFeB magnetic powder is tiled on the stainless steel plate, at 40 ℃, 1.0A/dm
2Condition under electrodeposit metals copper layer, apply electromagnetic field at bottom land in the electrodeposition process;
After (4) 30 minutes, powered-down takes out magnetic with the distilled water cleaning, does the solvent extraction dehydration with dehydrated alcohol then, and is dry under 40 ℃ of conditions through putting into vacuum drying oven behind the suction filtration, after hydrogen reducing can obtain being coated with the NdFeB magnetic powder of copper layer.
The beneficial effect of the method for the electrochemical deposition covered with metal layer of NdFeB magnetic powder of the present invention is mainly reflected in: (1) can realize the purpose of magnetic surface modification at low temperatures, improved the corrosion potential of NdFeB magnetic powder greatly, thereby improved the magnetic property of magnetic, improved the oxidation-resistance and the electroconductibility of magnetic; (2) utilize the electrochemical deposition technique covered with metal layer, technology is simple, and the metallic cover layer thickness can arbitrarily be controlled.
(4) embodiment
The present invention is described further below in conjunction with specific embodiment, but method related in the scheme and technical parameter can not be interpreted as limitation of the present invention.
Embodiment 1: the NdFeB magnetic powder electrochemical deposition coats nickel dam
Electric depositing solution prescription: NiSO
47H
2O 300g/L, NiCl6H
2O 40g/L, H
3BO
440g/L, sodium lauryl sulphate 0.1g/L.
Technology is as follows: take by weighing NiSO respectively
47H
2O 150g, NiCl6H
2O 20g, H
3BO
420g, sodium lauryl sulphate 0.05g, with water dissolution and be mixed with 500 milliliters electric depositing solution and pack in the groove, stainless steel plate is placed on bottom land and links to each other as negative electrode with the negative pole of power supply by lead-in wire, the nickel plate is suspended in the electric depositing solution as anode, and ratio of cathodic to anodic area is 1: 2.The NdFeB magnetic powder that takes by weighing the 50g trade mark then and be MQP13-9 is through the pre-treatment of oil removing in 5 minutes, clear water rinsing, 1 minute surface active, clear water rinsing process, to put into galvanic deposition cell through the NdFeB magnetic powder after the pre-treatment, through the sedimentation of certain hour, NdFeB magnetic powder is tiled on the stainless steel plate.At 25 ℃, 1.5A/dm
2Condition under galvanic deposit clad metal nickel dam.Move at bottom land with permanent magnet in the electrodeposition process, make NdFeB magnetic powder can paste stainless steel plate and constantly roll.After 30 minutes, powered-down takes out and cleans magnetic with distilled water, cleans later with anhydrous ethanol solvent extraction dehydration, put into vacuum drying oven 40 ℃ of dryings, after hydrogen reducing can obtain coating the NdFeB magnetic powder that contains 0.37% weight nickel dam through suction filtration.
Embodiment 2: the NdFeB magnetic powder electrochemical deposition coats the copper layer
Electric depositing solution prescription: CuCN 30g/L, NaCN 40g/L, Na
2CO
315g/L, Seignette salt 45g/L.
Technology is as follows: take by weighing CuCN 15g respectively, NaCN 20g, Na
2CO
37.5g, Seignette salt 22.5g, with water dissolution and be mixed with 500 milliliters electric depositing solution and pack in the groove, stainless steel plate is placed on bottom land and links to each other as negative electrode with the negative pole of power supply by lead-in wire, copper coin is suspended in the electric depositing solution as anode, and ratio of cathodic to anodic area is 1: 2.The NdFeB magnetic powder that takes by weighing the 50g MQP13-9 trade mark then is through the pre-treatment of oil removing in 5 minutes, clear water rinsing, 1 minute surface active, clear water rinsing process, to put into galvanic deposition cell through the NdFeB magnetic powder after the pre-treatment, through the sedimentation of certain hour, NdFeB magnetic powder is tiled on the stainless steel plate.At 40 ℃, 1.0A/dm
2Condition under galvanic deposit clad copper layer.Apply electromagnetic field at bottom land in the electrodeposition process, make NdFeB magnetic powder can paste stainless steel plate and constantly roll.After 30 minutes, powered-down takes out and cleans magnetic with distilled water, cleans later with anhydrous ethanol solvent extraction dehydration, put into vacuum drying oven 40 ℃ of dryings, after hydrogen reducing can obtain coating the NdFeB magnetic powder that contains 0.40% weight copper layer through suction filtration.
Embodiment 3: the NdFeB magnetic powder electrochemical deposition coats the iron layer
Electric depositing solution prescription: FeSO
4.7H
2O 280g/L, H
2SO
430g/L.
Technology is as follows: take by weighing FeSO respectively
4.7H
2O 150g, H
2SO
415g, with water dissolution and be mixed with 500 milliliters electric depositing solution and pack in the groove, stainless steel plate is placed on bottom land and links to each other as negative electrode with the negative pole of power supply by lead-in wire, and pure iron is suspended in the electric depositing solution as anode, and ratio of cathodic to anodic area is 1: 2.The NdFeB magnetic powder that takes by weighing the 50g MQP13-9 trade mark then is through the pre-treatment of oil removing in 5 minutes, clear water rinsing, 1 minute surface active, clear water rinsing process, to put into galvanic deposition cell through the NdFeB magnetic powder after the pre-treatment, through the sedimentation of certain hour, NdFeB magnetic powder is tiled on the stainless steel plate.At 20 ℃, 1.5A/dm
2Condition under galvanic deposit clad metal iron layer.Move back and forth at bottom land with permanent magnet in the electrodeposition process, make NdFeB magnetic powder can paste stainless steel plate and constantly roll.After 35 minutes, powered-down takes out and cleans magnetic with distilled water, cleans later with anhydrous ethanol solvent extraction dehydration, put into vacuum drying oven 40 ℃ of dryings, after hydrogen reducing can obtain coating the NdFeB magnetic powder that contains 0.42% weight iron through suction filtration.
Embodiment 4: the NdFeB magnetic powder electrochemical deposition coats the zinc layer
Electric depositing solution prescription: NH
4C1 260g/L, ZnCl
240g/L, H
3BO
330g/L.
Technology is as follows: take by weighing NH respectively
4Cl 130g, ZnCl
220g, H
3BO
315g, with water dissolution and be mixed with 500 milliliters electric depositing solution and pack in the groove, stainless steel plate is placed on bottom land and links to each other as negative electrode with the negative pole of power supply by lead-in wire, and pure zine plate is suspended in the electric depositing solution as anode, and ratio of cathodic to anodic area is 1: 2.The NdFeB magnetic powder that takes by weighing the 50g MQP13-9 trade mark then is through the pre-treatment of oil removing in 5 minutes, clear water rinsing, 1 minute surface active, clear water rinsing process, to put into galvanic deposition cell through the NdFeB magnetic powder after the pre-treatment, through the sedimentation of certain hour, NdFeB magnetic powder is tiled on the stainless steel plate.At 20 ℃, 1.5A/dm
2Condition under galvanic deposit clad metal zinc layer.Move back and forth at bottom land with permanent magnet in the electrodeposition process, make NdFeB magnetic powder can paste stainless steel plate and constantly roll.After 30 minutes, powered-down takes out and cleans magnetic with distilled water, cleans later with anhydrous ethanol solvent extraction dehydration, put into vacuum drying oven 40 ℃ of dryings, after hydrogen reducing can obtain coating the NdFeB magnetic powder that contains 0.45% weight zinc through suction filtration.
Embodiment 5: the NdFeB magnetic powder electrochemical deposition coats the tin layer
Electric depositing solution prescription: SnCl
25g/L, NH
4Cl 240g/L, N (CH
2COOH)
3) 45g/L.Technology is as follows: take by weighing SnCl respectively
22.5g, NH
4Cl120g, N (CH
2COOH)
3) 23g, with water dissolution and be mixed with 500 milliliters electric depositing solution and pack in the groove, stainless steel plate is placed on bottom land and links to each other as negative electrode with the negative pole of power supply by lead-in wire, and the tin utmost point is suspended in the electric depositing solution as anode, and ratio of cathodic to anodic area is 1: 2.The NdFeB magnetic powder that takes by weighing the 50g MQP13-9 trade mark then is through the pre-treatment of oil removing in 5 minutes, clear water rinsing, 1 minute surface active, clear water rinsing process, to put into galvanic deposition cell through the NdFeB magnetic powder after the pre-treatment, through the sedimentation of certain hour, NdFeB magnetic powder is tiled on the stainless steel plate.At 20 ℃, 0.7A/dm
2Condition under galvanic deposit clad metal tin layer.Move back and forth at bottom land with permanent magnet in the electrodeposition process, make NdFeB magnetic powder can paste stainless steel plate and constantly roll.After 30 minutes, powered-down takes out and cleans magnetic with distilled water, cleans later with anhydrous ethanol solvent extraction dehydration, put into vacuum drying oven 40 ℃ of dryings, after hydrogen reducing can obtain coating the NdFeB magnetic powder that contains 0.30% weight tin through suction filtration.
Embodiment 6: the NdFeB magnetic powder electrochemical deposition coats silver layer
Electric depositing solution prescription: AgNO
340g/L, Na
2S
2O
35H
2O 200g/L, K
2S
2O
540g/L.
Technology is as follows: take by weighing AgNO respectively
320g, Na
2S
2O
35H
2O 100g, K
2S
2O
520g, with water dissolution and be mixed with 500 milliliters electric depositing solution and pack in the groove, stainless steel plate is placed on bottom land and links to each other as negative electrode with the negative pole of power supply by lead-in wire, and stereotype is suspended in the electric depositing solution as anode, and ratio of cathodic to anodic area is 1: 2.The NdFeB magnetic powder that takes by weighing the 50g MQP13-9 trade mark then is through the pre-treatment of oil removing in 5 minutes, clear water rinsing, 1 minute surface active, clear water rinsing process, to put into galvanic deposition cell through the NdFeB magnetic powder after the pre-treatment, through the sedimentation of certain hour, NdFeB magnetic powder is tiled on the stainless steel plate.At 20 ℃, 0.15A/dm
2Condition under galvanic deposit clad metal silver layer.Move back and forth at bottom land with permanent magnet in the electrodeposition process, make NdFeB magnetic powder can paste stainless steel plate and constantly roll.After 30 minutes, powered-down takes out and cleans magnetic with distilled water, cleans later with anhydrous ethanol solvent extraction dehydration, put into vacuum drying oven 40 ℃ of dryings, after hydrogen reducing can obtain coating the NdFeB magnetic powder that contains 0.15% weight silver through suction filtration.
Embodiment 7: the NdFeB magnetic powder electrochemical deposition coats the gold layer
Electric depositing solution prescription: KAu (CN)
28g/L, KCN20g/L, K
2CO
310g/L.Technology is as follows: take by weighing KAu (CN) respectively
24g, KCN10g, K
2CO
35g, with water dissolution and be mixed with 500 milliliters electric depositing solution and pack in the groove, stainless steel plate is placed on bottom land and links to each other as negative electrode with the negative pole of power supply by lead-in wire, and stereotype is suspended in the electric depositing solution as anode, and ratio of cathodic to anodic area is 1: 2.The NdFeB magnetic powder that takes by weighing the 50g MQP13-9 trade mark then is through the pre-treatment of oil removing in 5 minutes, clear water rinsing, 1 minute surface active, clear water rinsing process, to put into galvanic deposition cell through the NdFeB magnetic powder after the pre-treatment, through the sedimentation of certain hour, NdFeB magnetic powder is tiled on the stainless steel plate.At 40 ℃, 0.1A/dm
2Condition under galvanic deposit coat the gold layer.Move back and forth at bottom land with permanent magnet in the electrodeposition process, make NdFeB magnetic powder can paste stainless steel plate and constantly roll.After 30 minutes, powered-down takes out and cleans magnetic with distilled water, cleans later with anhydrous ethanol solvent extraction dehydration, put into vacuum drying oven 40 ℃ of dryings, after hydrogen reducing can obtain coating the NdFeB magnetic powder that contains 0.12% weight gold through suction filtration.
Claims (10)
1. the method for the electrochemical deposition covered with metal layer of a NdFeB magnetic powder, it is characterized in that described method is: in the electrolyzer that fills the cationic electric depositing solution of containing metal, to place on the negative plate of conduction through the NdFeB magnetic powder of oil removing, activation pre-treatment, with the metal sheet with described electric depositing solution correspondence is anode, at cathode current density 0.1～5A/dm
2, under 10～50 ℃ of conditions of temperature, pass to electric current and the NdFeB magnetic powder surface coated go up metal level, obtain the NdFeB magnetic powder that the surface is coated with metal layer through purification procedures then.
2. the method for the electrochemical deposition covered with metal layer of NdFeB magnetic powder as claimed in claim 1 is characterized in that the bottom land of described electrolyzer applies vicissitudinous magnetic field, and ratio of cathodic to anodic area is 1: 2～4.
3. the method for the electrochemical deposition covered with metal layer of NdFeB magnetic powder as claimed in claim 2 is characterized in that described metal is one of following:
1. nickel 2. copper 3. iron 4. zinc 5. tin 6. silver 7. the gold.
4. the method for the electrochemical deposition covered with metal layer of NdFeB magnetic powder as claimed in claim 2, it is characterized in that described purification procedures is: magnetic is taken out clean with distilled water, do the solvent extraction dehydration with dehydrated alcohol then, 20 ℃～100 ℃ vacuum-dryings are after the NdFeB magnetic powder that hydrogen reducing obtains being coated with metal layer.
5. as the method for the electrochemical deposition covered with metal layer of the described NdFeB magnetic powder of one of claim 1～4, it is characterized in that described oil removing, activation pre-treatment step are:
(1) oil removing: with containing 5～20g/LNaOH, 5～20g/LNa
2CO
3, 5～10g/LNa
3PO
4, 0.008～0.05g/L Sodium dodecylbenzene sulfonate the thorough oil removing of solution;
(2) surface active: activate with dilute acid soln.
6. the method for the electrochemical deposition covered with metal layer of NdFeB magnetic powder as claimed in claim 5 is characterized in that described nickeliferous cationic electric depositing solution prescription is:
NiSO
4·7H
2O?300g/L，
NiCl·6H
2O?40g/L，
H
3BO
4?40g/L，
Sodium lauryl sulphate 0.1g/L.
7. the method for the electrochemical deposition covered with metal layer of NdFeB magnetic powder as claimed in claim 5 is characterized in that the cationic electric depositing solution prescription of described iron content is:
FeSO
4·7H
2O?280gL，
H
2SO
4?30g/L。
8. the method for the electrochemical deposition covered with metal layer of NdFeB magnetic powder as claimed in claim 5 is characterized in that the described electric depositing solution prescription that contains zinc cation is:
NH
4Cl?260g/L，ZnCl
2?40g/L，H
3BO
3?30g/L。
9. the method for the electrochemical deposition covered with metal layer of NdFeB magnetic powder as claimed in claim 6 is characterized in that:
Described electric depositing solution prescription is:
NiSO
4·7H
2O?300g/L，
NiCl·6H
2O?40g/L，
H
3BO
4?40g/L，
Sodium lauryl sulphate 0.1g/L
Described method is carried out as follows:
(1) gets the pre-treatment that NdFeB magnetic powder carries out oil removing in 5 minutes, clear water rinsing, 1 minute surface active, clear water rinsing process;
(2) measure NiSO by prescription
47H
2O, NiCl6H
2O, H
3BO
4And sodium lauryl sulphate, being mixed with electric depositing solution with water dissolution and packing in the groove, stainless steel plate is positioned over bottom land and links to each other as negative electrode with the negative pole of power supply by lead-in wire, and the nickel plate hangs in the electric depositing solution as anode, and ratio of cathodic to anodic area is 1: 2;
(3) NdFeB magnetic powder after will handling is put into groove, and through precipitation after a while, NdFeB magnetic powder is tiled on the stainless steel plate, at 25 ℃, 1.5A/dm
2Condition under the electrodeposit metals nickel dam, move at bottom land with permanent magnet in the electrodeposition process;
After (4) 30 minutes, powered-down takes out magnetic with the distilled water cleaning, does the solvent extraction dehydration with dehydrated alcohol then, and is dry under 40 ℃ of conditions through putting into vacuum drying oven behind the suction filtration, after hydrogen reducing can obtain being coated with the NdFeB magnetic powder of nickel dam.
10. the method for the electrochemical deposition covered with metal layer of NdFeB magnetic powder as claimed in claim 5 is characterized in that:
Described electric depositing solution prescription is:
CuCN 30g/L, NaCN 40g/L, 15g/L, Seignette salt 45g/L;
Described method is carried out as follows:
(1) gets the pre-treatment that NdFeB magnetic powder carries out oil removing in 5 minutes, clear water rinsing, 1 minute surface active, clear water rinsing process;
(2) measure CuCN, NaCN, Na by prescription
2CO
3And Seignette salt, being mixed with electric depositing solution with water dissolution and packing in the groove, stainless steel plate is positioned over bottom land and links to each other as negative electrode with the negative pole of power supply by lead-in wire, and copper coin hangs in the electric depositing solution as anode, and ratio of cathodic to anodic area is 1: 2;
(3) NdFeB magnetic powder after will handling is put into groove, and through precipitation after a while, NdFeB magnetic powder is tiled on the stainless steel plate, at 40 ℃, 1.0A/dm
2Condition under electrodeposit metals copper layer, apply electromagnetic field at bottom land in the electrodeposition process;
After (4) 30 minutes, powered-down takes out magnetic with the distilled water cleaning, does the solvent extraction dehydration with dehydrated alcohol then, and is dry under 40 ℃ of conditions through putting into vacuum drying oven behind the suction filtration, after hydrogen reducing can obtain being coated with the NdFeB magnetic powder of copper layer.
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| CN102299000A (en) * | 2010-06-26 | 2011-12-28 | 比亚迪股份有限公司 | NdFeB (neodymium iron boron) permanent magnet material and preparation method thereof |
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| CN109273184A (en) * | 2018-10-19 | 2019-01-25 | 广东省稀有金属研究所 | A kind of monocrystalline magnetic powder of Low-cost corrosion-resistant and the preparation method and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS62259407A (en) * | 1986-05-02 | 1987-11-11 | Seiko Epson Corp | Manufacture of sintered rare earth magnet |
| JPH01225102A (en) * | 1988-03-04 | 1989-09-08 | Nippon Steel Corp | High corrosion-resistant rare earth permanent magnet, raw material powder therefor and manufacture thereof |
| JP3028337B2 (en) * | 1988-07-21 | 2000-04-04 | 株式会社トーキン | Rare earth magnet alloy powder, method for producing the same, and polymer composite rare earth magnet using the same |
| CN1058053A (en) * | 1991-06-01 | 1992-01-22 | 东北工学院 | The method of electroplating bright nickel on Nd-Fe-B alloy |
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