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Technology for improving surface roughness of neodymium-iron-boron magnetic steel after electroplating

A surface roughness and NdFeB technology, which is applied in the process of improving the surface roughness of NdFeB magnets after electroplating, can solve the problems of the decrease in the roughness of NdFeB magnets, reduce production costs and ensure reliability and service life, to ensure the effect of protection ability

Inactive Publication Date: 2019-04-02
ZHEJIANG DONGYANG DMEGC RARE EARTH MAGNET CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above problems, the present invention provides a process for improving the surface roughness of NdFeB magnets after electroplating, which can solve the problem of the decrease in roughness of NdFeB magnets after electroplating protection

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A process for improving the surface roughness of NdFeB magnets after electroplating, comprising the following steps:

[0032] a) Physical roughening: The chamfered NdFeB magnets are physically roughened by a dry vibration mill, in which the weight ratio of the abrasive brown corundum to the magnet is 3:1, and the treatment time is 1 hour. Brown corundum The particle size is 12mm; 80-mesh diamond is also added to assist coarsening, and the amount added is 0.5 grams of diamond per kilogram of NdFeB magnets;

[0033] b) Chemical roughening: Treat the above-treated NdFeB magnets with a roughening pickling solution for 20 seconds; the roughening pickling solution consists of the following components, analytically pure sulfuric acid 0.5mL / L, analytically pure hydrochloric acid 0.2 mL / L, urotropine 3g / L, the balance is water;

[0034] c) Barrel plating: use the plating solution to carry out barrel plating on the chemically roughened NdFeB magnets, the drum speed is 2rpm; the ...

Embodiment 2

[0037] A process for improving the surface roughness of NdFeB magnets after electroplating, comprising the following steps:

[0038] a) Physical roughening: The chamfered NdFeB magnetic steel is physically roughened by a dry vibration mill, in which the weight ratio of the abrasive brown corundum to the magnetic steel is 5:1, and the treatment time is 6 hours. Brown corundum The particle size is 15mm; 200-mesh diamond is also added to assist coarsening, and the amount added is 2.0 grams of diamond per kilogram of NdFeB magnets;

[0039] b) Chemical roughening: Treat the above-mentioned NdFeB magnets with a roughening pickling solution for 60 seconds; the roughening pickling solution consists of the following components, analytically pure sulfuric acid 4mL / L, analytically pure hydrochloric acid 1.2mL / L, urotropine 5g / L, the balance is water;

[0040] c) Barrel plating: The chemically roughened NdFeB magnets are barrel-plated with a plating solution, the drum speed is 4rpm; th...

Embodiment 3

[0043] A process for improving the surface roughness of NdFeB magnets after electroplating, comprising the following steps:

[0044] a) Physical roughening: The chamfered NdFeB magnetic steel is physically roughened by a dry vibration mill, in which the weight ratio of the abrasive brown corundum to the magnetic steel is 4:1, and the treatment time is 3 hours. Brown corundum The particle size is 13mm; 160-mesh diamond is also added to assist coarsening, and the amount added is 1.0 grams of diamond per kilogram of NdFeB magnets;

[0045] b) Chemical roughening: Treat the above-mentioned NdFeB magnets with a roughening pickling solution for 30 seconds; the roughening pickling solution consists of the following components, analytically pure sulfuric acid 1.5mL / L, analytically pure hydrochloric acid 0.4 mL / L, urotropine 3.5g / L, the balance is water;

[0046] c) Barrel plating: The chemically roughened NdFeB magnets are barrel-plated with a plating solution, the drum speed is 3rpm...

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Abstract

The invention belongs to the technical field of magnetic materials, and discloses a technology for improving the surface roughness of neodymium-iron-boron magnetic steel after electroplating. The technology comprises the steps of physical coarsening, chemical coarsening, barrel plating and the like. According to the technology, the physical coarsening process and the chemical coarsening process cannot damage a neodymium-iron-boron magnetic steel matrix, the magnetic property cannot be reduced, the binding force between the matrix and a coating layer cannot be influenced, and the protection capability of the coating layer cannot be reduced. No organic additive is added in the barrel plating process adopted in the technology, and an inorganic additive is added, so that it is guaranteed thatthe product electroplated layer is free of decomposition and volatilization of organic components during the later storage, the situation that the wettability is affected due to reduction of the surface tension of the coating layer cannot be caused, and the phenomenon that the adhesive is not firm due to the fact that the surface wettability of the coating layer is reduced is avoided.

Description

technical field [0001] The invention relates to the technical field of magnetic materials, in particular to a process for improving the surface roughness of NdFeB magnets after electroplating. Background technique [0002] As we all know, NdFeB magnets have been widely used in micro motors, high-end communication electronic equipment, drones, energy-saving motors, electronics, electric vehicles, wind power and other industries. However, NdFeB magnets adopt a sintered powder metallurgy process. The matrix material is loose and porous, and other rare earth elements such as neodymium are easily oxidized in the air and become invalid. In order to prolong its service life, it must be processed on its surface. Electroplating surface protection treatment, so that the service life of NdFeB magnets can be extended, but the products after electroplating under the conventional process cannot meet the user's surface roughness requirements, and the electroplating process of the conventio...

Claims

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Application Information

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IPC IPC(8): C25D5/36C25D3/12C23G1/08B24B1/04
CPCB24B1/04C23G1/081C25D3/12C25D5/36
Inventor 龙送林张有平陈辉辉胡柏轩厉凌峰
Owner ZHEJIANG DONGYANG DMEGC RARE EARTH MAGNET CO LTD
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