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Method for plating double-layer zinc on surface of neodymium-iron-boron permanent magnet material

A permanent magnet material, neodymium-iron-boron technology, applied in the direction of jewelry, etc., can solve the problems of poor coating adhesion, poor surface condition, and low anti-corrosion ability, so as to improve the coating adhesion, reduce the generation of acid mist, and reduce porosity Effect

Inactive Publication Date: 2020-02-14
ARCFL TECHNOLOGY LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the sintered NdFeB permanent magnet material is a product formed by powder metallurgy sintering, which has a loose structure, high porosity, poor surface condition, and high brittleness.
At present, the potassium salt galvanized surface protection technology has disadvantages such as poor coating adhesion and low anti-corrosion ability.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A method for coating the surface of a neodymium-iron-boron permanent magnet material with double-layer zinc, comprising the steps of:

[0028] Step 1) Degreasing the NdFeB permanent magnet material;

[0029] The grade of the permanent magnet is 35SH, and the size is 10×4.32×1.7mm. Grinding and chamfering NdFeB permanent magnet materials, in a 60L chamfering machine, put 30~40kg of silicon carbide abrasives of d6~d8, 15~20kg of NdFeB products, chamfering frequency 40~50Hz, sealed water Chamfering, chamfering time 6~8h, chamfering size R0.1~0.3.

[0030] Soak the ground and chamfered NdFeB permanent magnet material in a degreasing agent with a temperature of 50°C and a concentration of 20mL / L for 60s. The degreasing agent is CY-1 degreasing agent.

[0031] Step 2) Clean the NdFeB permanent magnet material after degreasing, and then pickle the NdFeB permanent magnet material;

[0032] Wash the NdFeB permanent magnet material with hot water at 50°C for 60s. Pickle the ...

Embodiment 2

[0045] A method for coating the surface of a neodymium-iron-boron permanent magnet material with double-layer zinc, comprising the steps of:

[0046] Step 1) Degreasing the NdFeB permanent magnet material;

[0047] The grade of the permanent magnet is 35SH, and the size is 10×4.32×1.7mm. Grinding and chamfering NdFeB permanent magnet materials, in a 60L chamfering machine, put 30~40kg of silicon carbide abrasives of d6~d8, 15~20kg of NdFeB products, chamfering frequency of 40~50Hz, sealed water Chamfering, chamfering time 6~8h, chamfering size R0.1~0.3.

[0048] Soak the ground and chamfered NdFeB permanent magnet material in a degreasing agent with a temperature of 40°C and a concentration of 15mL / L for 70s in ultrasonic waves. The degreasing agent is CY-1 degreasing agent.

[0049] Step 2) Clean the NdFeB permanent magnet material after degreasing, and then pickle the NdFeB permanent magnet material;

[0050] Wash the NdFeB permanent magnet material in hot water at 40°C ...

Embodiment 3

[0062] A method for coating the surface of a neodymium-iron-boron permanent magnet material with double-layer zinc, comprising the steps of:

[0063] Step 1) Degreasing the NdFeB permanent magnet material;

[0064] The grade of the permanent magnet is 35SH, and the size is 10×4.32×1.7mm. Grinding and chamfering NdFeB permanent magnet materials, in a 60L chamfering machine, put 30~40kg of silicon carbide abrasives of d6~d8, 15~20kg of NdFeB products, chamfering frequency 40~50Hz, sealed water Chamfering, chamfering time 6~8h, chamfering size R0.1~0.3.

[0065] Soak the ground and chamfered NdFeB permanent magnet material in a degreasing agent with a temperature of 60°C and a concentration of 25mL / L for 50s. The degreasing agent is CY-1 degreasing agent.

[0066] Step 2) Clean the NdFeB permanent magnet material after degreasing, and then pickle the NdFeB permanent magnet material;

[0067] Wash the NdFeB permanent magnet material in hot water at 60°C for 50s. Pickle the wa...

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Abstract

The invention discloses a method for plating double-layer zinc on the surface of a neodymium-iron-boron permanent magnet material, and belongs to the field of surface treatment of sintered neodymium-iron-boron permanent magnet materials. The method is characterized in that the method comprises the following steps: (1) deoiling the neodymium-iron-boron permanent magnet material; (2) cleaning the deoiled neodymium-iron-boron permanent magnet material, and then pickling the neodymium-iron-boron permanent magnet material; (3) activating the acid-washed neodymium-iron-boron permanent magnet material; (4) performing sulfate zinc electroplating on the neodymium-iron-boron permanent magnet material to form a bottom zinc layer; (5) performing potassium salt zinc plating on the neodymium-iron-boronpermanent magnet material to form a surface zinc layer; and (6) passivating the surface of the galvanized neodymium-iron-boron permanent magnet material. The neodymium, iron and boron treated by the method for plating the double-layer zinc on the surface of the neodymium-iron-boron permanent magnet material are excellent in corrosion resistance, the salt spray resistance experiment after passivation can reach more than 120 hours, the bonding strength of a galvanized layer and the neodymium-iron-boron permanent magnet material is improved, and the corrosion resistance of the galvanized layer isalso improved.

Description

technical field [0001] The invention discloses a method for coating double-layer zinc on the surface of an NdFeB permanent magnet material, which belongs to the field of surface treatment of sintered NdFeB permanent magnet materials. Background technique [0002] NdFeB permanent magnet material is the third-generation new functional material developed in the 1980s. It has energy conversion function and is an efficient energy conversion medium. It is widely used in communication, instrumentation, nuclear magnetic resonance and other fields. However, since sintered NdFeB is composed of Nd-rich phase, B-rich phase and main phase Nd2Fe14B, the electrode potentials of each phase are different, and intergranular corrosion is prone to occur, resulting in a decrease in the corrosion resistance of the body itself, which limits the further development of NdFeB. promotional application. For this reason, people in the industry have invented a series of surface treatment technologies fo...

Claims

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Application Information

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IPC IPC(8): C25D5/10C25D3/22C25D5/36C25D5/48C25D7/00
CPCC25D3/22C25D5/10C25D5/36C25D5/48C25D7/001
Inventor 张友亮仉喜峰孙菲菲李军
Owner ARCFL TECHNOLOGY LIMITED
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