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Process method for reducing magnetic loss of neodymium-iron-boron permanent magnet under high-temperature and high-humidity conditions

A high-temperature, high-humidity, process method technology is applied in the field of reducing the magnetic loss of NdFeB permanent magnets under high-temperature and high-humidity conditions.

Active Publication Date: 2012-07-18
SHENYANG GENERAL MAGNETIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above-mentioned sintered NdFeB permanent magnet electroplating under the existing electroplating process conditions, the magnetic loss is as high as 15% to 18% after 24 hours of high temperature and high humidity (temperature 85°C, humidity 85%) test

Method used

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  • Process method for reducing magnetic loss of neodymium-iron-boron permanent magnet under high-temperature and high-humidity conditions
  • Process method for reducing magnetic loss of neodymium-iron-boron permanent magnet under high-temperature and high-humidity conditions
  • Process method for reducing magnetic loss of neodymium-iron-boron permanent magnet under high-temperature and high-humidity conditions

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Effect test

Embodiment 1

[0016] For a piece of NdFeB permanent magnet, it is required to have a magnetic loss of ≤10% after 24 hours of high temperature and high humidity test after electroplating NiCuNi. The specific process method is as follows:

[0017] 1. Take 3kg of the product of this specification and use anhydrous dry chamfering in a flat-bottomed vibrating finishing machine. The abrasive is a spherical type with a diameter of Φ3, the weight is 25kg, the chamfering time is 3 hours, and the vibration frequency is 40r / min.

[0018] 2. Use ultrasonic waves to degrease in a neutral degreasing solution with a temperature controlled at 60°C for 2 minutes, and wash with flowing water to remove the degreasing liquid on the surface of the product.

[0019] 3. Use 1% HNO 3 The solution is pickled for 20 seconds, and ultrasonic cleaning is performed immediately after each 5 seconds, and the residual acid solution in the blind hole of the sintered NdFeB permanent magnet is removed by using the ultrasonic...

Embodiment 2

[0026] For a piece of NdFeB permanent magnet, it is required to have a magnetic loss of ≤10% after 24 hours of high temperature and high humidity test after electroplating NiCuNi. The specific process method is as follows:

[0027] 1. Take 3kg of the product of this specification and use anhydrous dry chamfering in a flat-bottomed vibrating finishing machine. The abrasive is a ball type with a diameter of Φ3, the weight is 25kg, the chamfering time is 3 hours, and the vibration frequency is 40r / min.

[0028] 2. Use ultrasonic waves to degrease in a neutral degreasing solution with a temperature controlled at 60°C for 2 minutes, and wash with flowing water to remove the degreasing liquid on the surface of the product.

[0029] 3. Use 1% HNO 3 The solution is pickled for 20 seconds, and ultrasonic cleaning is performed immediately after each 5 seconds, and the residual acid solution in the blind hole of the sintered NdFeB permanent magnet is removed by using the ultrasonic cavi...

Embodiment 3

[0039] For a piece of NdFeB permanent magnet, it is required to have a magnetic loss of ≤10% after 24 hours of high temperature and high humidity test after electroplating NiCuNi. The specific process method is as follows:

[0040] 1. Take 3kg of the product of this specification and use anhydrous dry chamfering in a flat-bottomed vibrating finishing machine. The abrasive is a ball type with a diameter of Φ3, the weight is 25kg, the chamfering time is 3 hours, and the vibration frequency is 40r / min.

[0041] 2. Use ultrasonic waves to degrease in a neutral degreasing solution with a temperature controlled at 60°C for 2 minutes, and wash with flowing water to remove the degreasing liquid on the surface of the product.

[0042] 3. Use 1% HNO 3 The solution is pickled for 20 seconds, and ultrasonic cleaning is performed immediately after each 5 seconds, and the residual acid solution in the blind hole of the sintered NdFeB permanent magnet is removed by using the ultrasonic cavi...

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Abstract

The invention relates to the technical field of electroplating protection of neodymium-iron-boron permanent magnet materials, in particular to a process method for reducing the magnetic loss of a neodymium-iron-boron permanent magnet under high-temperature and high-humidity conditions. The process method comprises the following steps of: performing chamfering, deoiling, acid cleaning and activation pretreatment processes, an electroplating process and an electroplating post-treatment process on the neodymium-iron-boron permanent magnet, wherein in the electroplating process, a bottom nickel plated layer, an intermediate copper layer and an outer nickel plated layer are sequentially plated from inside to outside, the thickness of the bottom nickel plated layer is 5-10 mu m, the thickness of the intermediate copper layer is 5-7 mu m and the thickness of the outer nickel plated layer is 5-10 mu m. According to the process method disclosed by the invention, the magnetic loss of the sintered neodymium-iron-boron permanent magnet under the moisture and heat-resistant conditions by combining the plated layers with the different thicknesses, the quality of an electroplated nickel layer and the performances of the sintered neodymium-iron-boron permanent magnet material are significantly improved, and the neodymium-iron-boron permanent magnet material further has broader application prospects.

Description

technical field [0001] The invention relates to the technical field of electroplating protection for NdFeB permanent magnet materials, in particular to a process method for reducing the magnetic loss of NdFeB permanent magnets under high temperature and high humidity conditions. Background technique [0002] Analysis of the metallographic structure of NdFeB material shows that it has three phases: Nd 2 Fe 14 B phase; Nd-rich phase; B-rich phase. Among them, Nd 2 Fe 14 B is the main phase, and the grains are polygonal; the B-rich phase exists in the form of isolated blocks or particles; the Nd-rich phase is distributed along the grain boundaries or at the intersection of grain boundaries; this metallographic structure is very good for magnetic properties. It can be said that it is necessary, but it is very unfavorable from the perspective of anti-corrosion. This is due to the fact that electrochemical corrosion occurs between different phases due to different potentials. ...

Claims

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Application Information

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IPC IPC(8): C25D5/14C25D3/12C25D3/38
Inventor 孙宝玉惠鑫裴文利刘振刚崔振华
Owner SHENYANG GENERAL MAGNETIC
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