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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, NdFeB technology, which is applied in the field of electroplating protection of NdFeB permanent magnet materials, can solve the problems of high magnetic loss, achieve the effect of improving capacity, improving quality, and broad application prospects

Active Publication Date: 2015-04-22
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 spherical 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...

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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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Patent Type & Authority Patents(China)
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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