Surface treatment method for electric phosphorization of permanent magnet material

A technology of surface treatment and permanent magnet materials, which is applied to the surface treatment of NdFeB permanent magnet materials and the field of electrophosphating of permanent magnet materials, which can solve the problems of affecting the service life of NdFeB permanent magnets, reducing product stability and reliability, NdFeB alloy has poor corrosion resistance and other problems, so as to save the surface adjustment process, easy control and short processing time

Inactive Publication Date: 2014-05-21
BEIJING ZHONG KE SAN HUAN HI TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The rare earth element neodymium in the NdFeB powder alloy is active in nature, which makes the corrosion resistance of the entire NdFeB alloy very poor. It is easy to rust and corrode in a hot and humid environment, and the magnetic properties will be reduced or damaged due to corrosion failure. , which seriously affects the service life of NdFeB permanent magnets and reduces the stability and reliability of the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Will 2.3 kilograms of sintered NdFeB permanent magnet materials were first polished in a vibration mill for 2 hours. After degreasing with 20g / liter of sodium phosphate, 10g / liter of sodium carbonate, and 10g / liter of sodium hydroxide, pickling in 1% nitric acid to remove surface oxides, washing with water, and electrophosphating treatment. Phosphoric acid 15 g / L, zinc oxide 15 g / L, surfactant OP-10 1 g / L, carbon steel as anode, magnet as cathode, voltage 6 volts, reaction 15 seconds, phosphating layer thickness 0.3 microns. The coating has good adhesion and is qualified in the scratch test, and the anti-corrosion performance is shown in Table 1.

Embodiment 2

[0019] Will 2.3 kilograms of sintered NdFeB permanent magnet materials were first polished in a vibration mill for 2 hours. After degreasing with 20g / liter of sodium phosphate, 10g / liter of sodium carbonate, and 10g / liter of sodium hydroxide, pickling in 1% nitric acid to remove surface oxides, washing with water, and electrophosphating treatment. Phosphoric acid 50 g / L, zinc oxide 5 g / L, manganese dihydrogen phosphate 8 g / L, surfactant OP-105 g / L, carbon steel as anode, magnet as cathode, voltage 6 volts, reaction 10 seconds, phosphorus The layer thickness is 10 microns. The coating has good adhesion and is qualified in the scratch test, and the anti-corrosion performance is shown in Table 1.

Embodiment 3

[0021] Will 2.3 kilograms of sintered NdFeB permanent magnet materials were first polished in a vibration mill for 2 hours. After degreasing with 20g / liter of sodium phosphate, 10g / liter of sodium carbonate, and 10g / liter of sodium hydroxide, pickling in 1% nitric acid to remove surface oxides, washing with water, and electrophosphating treatment. Phosphoric acid 35 g / L, zinc oxide 3 g / L, nickel oxide 0.5 g / L, surfactant OP-103 g / L, carbon steel as anode, magnet as cathode, voltage 6 volts, reaction 80 seconds, phosphating layer 3 microns thick. The coating has good adhesion and is qualified in the scratch test, and the anti-corrosion performance is shown in Table 1.

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Abstract

The present invention provides a surface treatment method for electric phosphorization of a permanent magnet material. The surface treatment method comprises: (1) chamfering polishing: adopting a mechanical vibration mill and tumbling chamfer method to carry out conventional polishing on a neodymium-iron-boron permanent magnet material; (2) degreasing and deoiling: adding sodium phosphate, sodium carbonate or sodium hydroxide to carry out conventional defatting and deoiling; (3) acid washing rust removing: adding a nitric acid solution to carry out conventional acid washing rust removing and water washing; (4) an electric phosphorization treatment: adopting an electric phosphorization agent to carry out an electric phosphorization treatment; and (5) water washing and blow drying. According to the present invention, the surface treatment method has characteristics of simpleness, rapidness and environmental protection, and the high corrosion resistance is provided; the treatment process has characteristics of no sediment production, short treatment time and simple control; and the treatment steps are less, the surface conditioning step can be saved, the tank solution can be reused, and the adhesion of the paint on the substrate is effectively improved.

Description

technical field [0001] The invention relates to the field of surface treatment of materials, in particular to the surface treatment technology of NdFeB permanent magnet materials. Specifically, the invention relates to an electrophosphating technology of permanent magnet materials. Background technique [0002] In recent years, the application and development of NdFeB permanent magnet materials has been very rapid, and the success of the protection of NdFeB permanent magnet materials is one of the key technologies related to the promotion and application of materials. The material is mainly made of rare earth metals such as neodymium Nd, iron and boron through powder metallurgy process. As the strongest magnetic material at present, it has been widely used in electroplating devices, machinery, medical treatment, automobiles and other fields, and its application prospects are very broad. [0003] The premise of the application of NdFeB permanent magnet materials is to first ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/36
Inventor 白晓刚潘广麾
Owner BEIJING ZHONG KE SAN HUAN HI TECH
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