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Phosphorization method for sintered Nd-Fe-B magnetic material

A magnetic material, neodymium-iron-boron technology, applied in the coating process of metal materials, etc., can solve the problems of low bonding force between the substrate and the coating film, poor stability of the medium temperature phosphating process, and high energy consumption

Inactive Publication Date: 2016-08-24
CHONGQING BAWANG ENVIRONMENTAL PROTECTION NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the organic coating used for NdFeB permanent magnet materials has an unsatisfactory pre-treatment degreasing effect, poor stability of the medium-temperature phosphating process, high energy consumption, low corrosion resistance of the formed phosphating film, and low bonding force between the substrate and the coating film. , the phosphating of NdFeB permanent magnet materials is the key to the application of its organic coating technology

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0023] The phosphating method of sintered NdFeB magnetic materials, the process includes: rolling chamfering - sealing - degreasing - derusting - surface adjustment - normal temperature phosphating - passivation and other steps, wherein:

[0024] 1. Rolling and chamfering

[0025] Vibration grinder, drum grinder, and centrifugal grinder are used to put different specifications of sintered NdFeB magnetic materials and abrasives into the grinder for grinding.

[0026] 2. Sealing

[0027] The surface of sintered NdFeB magnetic material is rough and has high porosity. It is easy to corrode in acidic and alkaline solutions. The hole sealing method can improve its corrosion resistance. The method is as follows: put the sintered NdFeB magnetic material with rolling and chamfering into the zinc stearate molten body, take it out after a period of time, cool it, remove the solidified zinc stearate, and complete the hole sealing.

[0028] 3. Degreasing

[0029] Put the sintered NdFeB ...

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Abstract

The invention discloses a phosphorization method for a sintered Nd-Fe-B magnetic material. In the technical scheme, through a physical pore-sealing method, pores in the sintered Nd-Fe-B magnetic material are sealed, and the material then is subjected to phosphorization and passivation. The phosphorization method includes the steps of: roll burnishing and chamfering, pore sealing, oil removal, rust removal, surface finishing, normal-temperature phosphorization and passivation. The method is suitable for industrial production. The material is strong in anti-corrosion performance and has low cost.

Description

technical field [0001] The invention relates to the field of organic coating pretreatment on the surface of sintered NdFeB magnetic materials, in particular to the phosphating method of sintered NdFeB magnetic materials. Background technique [0002] NdFeB permanent magnet materials are widely used in high-tech industries such as computers, electronic communications, information systems, micro-motors, automobiles, nuclear magnetic resonance, and instruments because of their high saturation magnetization, coercive force, and large magnetic energy product. NdFeB permanent magnet material is a product formed by powder metallurgy sintering, with loose structure, high porosity and poor surface condition. The standard electrode potential of neodymium is even more negative than that of iron. It is easily oxidized in humid air and corroded by a strong reaction with acidic substances in the air. It is easy to cause intergranular corrosion, forming oxides and hydrides of neodymium and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/73
Inventor 谭光英刘廷川
Owner CHONGQING BAWANG ENVIRONMENTAL PROTECTION NEW MATERIAL CO LTD