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Method for preparing neodymium-iron-boron magnetic powder coated with metal layer by electrochemical deposition

A technology of deposition coating and NdFeB, applied in the direction of circuits, magnetic materials, magnetic objects, etc., can solve the problems of magnetic powder magnetic reduction, oxidation deepening, etc., and achieve the effect of improving magnetic properties, increasing corrosion potential, and controlling thickness at will

Inactive Publication Date: 2005-11-02
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the shortcomings of the surface treatment of NdFeB magnetic powder in the prior art, the magnetism of the magnetic powder is reduced and the oxidation is deepened. Electrochemical deposition of boron magnetic powder coated metal layer method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1: Electrochemical deposition of NdFeB magnetic powder coating nickel layer

[0035] Electrodeposition solution formulation: NiSO 4 ·7H 2 O 300g / L, NiCl 6H 2 O 40g / L, H 3 BO 4 40g / L, sodium lauryl sulfate 0.1g / L.

[0036] The process is as follows: Weigh NiSO 4 ·7H 2 O 150g, NiCl 6H 2 O 20g, H 3 BO 420g, 0.05g of sodium lauryl sulfate, dissolved in water and prepared into 500 ml of electrodeposition solution and loaded into the tank, the stainless steel plate is placed on the bottom of the tank and connected to the negative pole of the power supply through a lead wire as the cathode, and the nickel plate is hung on the electrodeposition The solution is used as the anode, and the area ratio of cathode and anode is 1:2. Then weigh 50g of NdFeB magnetic powder with the brand MQP13-9, go through the pretreatment of degreasing for 5 minutes, rinsing with water, 1 minute of surface activation, and rinsing with water, and put the pretreated NdFeB magnetic pow...

Embodiment 2

[0037] Example 2: Electrochemical deposition of NdFeB magnetic powder coating copper layer

[0038] Electrodeposition solution formula: CuCN 30g / L, NaCN 40g / L, NaCN 2 CO 3 15g / L, potassium sodium tartrate 45g / L.

[0039] The process is as follows: Weigh CuCN 15g, NaCN 20g, NaCN 2 CO 3 7.5g, 22.5g of potassium sodium tartrate, dissolved in water and prepared into 500 milliliters of electrodeposition solution is loaded into the tank, the stainless steel plate is placed on the bottom of the tank and is connected to the negative pole of the power supply by a lead wire as the cathode, and the copper plate is hung in the electrodeposition solution as the cathode. The anode, cathode and anode area ratio is 1:2. Then weigh 50g of MQP13-9 grade NdFeB magnetic powder, go through the pretreatment of degreasing for 5 minutes, rinsing with water, 1 minute of surface activation, and rinsing with water, and put the pretreated NdFeB magnetic powder into the electrodeposition tank After...

Embodiment 3

[0040] Example 3: Electrochemical deposition of NdFeB magnetic powder coating iron layer

[0041] Electrodeposition solution formula: FeSO 4 .7H 2 O 280g / L, H 2 SO 4 30g / L.

[0042] The process is as follows: Weigh FeSO 4 .7H 2 O 150g, H 2 SO 4 15g, dissolved in water and prepared into 500ml of electrodeposition solution, put it into the tank, the stainless steel plate is placed on the bottom of the tank and connected to the negative pole of the power supply through the lead wire as the cathode, and the pure iron is suspended in the electrodeposition solution as the anode, the area ratio of cathode and anode It is 1:2. Then weigh 50g of MQP13-9 grade NdFeB magnetic powder, go through the pretreatment of degreasing for 5 minutes, rinsing with water, 1 minute of surface activation, and rinsing with water, and put the pretreated NdFeB magnetic powder into the electrodeposition tank After a certain period of settlement, the NdFeB magnetic powder is spread on the stainles...

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PUM

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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 [0001] The invention relates to a method for coating a metal layer on the surface of rare earth permanent magnet powder neodymium-iron-boron magnetic powder by using an electrochemical deposition technology, and belongs to the technical field of metal powder surface treatment. (2) Background technology [0002] NdFeB is a magnetic material with good magnetic properties in modern times. After magnetization, it can pick up steel parts whose volume is more than 600 times its own volume, and has been widely used. Because the corrosion potential of NdFeB material is too low, it is easy to cause electrochemical corrosion and reduce its performance. Therefore, in order to improve the oxidation resistance and magnetic properties of NdFeB magnetic powder, people have been working on modifying the surface of NdFeB magnetic powder through different surface treatment methods. [0003] Zhang Yinglan proposed to use sol-gel and spin coating technology to coat the surf...

Claims

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Application Information

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IPC IPC(8): C25D7/00
Inventor 姜力强郑精武盛嘉伟林旻
Owner ZHEJIANG UNIV OF TECH
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