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Preparation method of particle-enhanced organic anticorrosive coating on surface of neodymium-iron-boron permanent magnet material

A surface particle and anti-corrosion coating technology, applied in the direction of coating, electrolytic coating, electrophoretic plating, etc., can solve the problems of poor corrosion resistance, achieve high cost performance of products, realize the effect of simple and easy industrial application, and prolong service life

Inactive Publication Date: 2012-05-09
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a method for preparing an NdFeB permanent magnet surface particle-reinforced organic anti-corrosion coating, in order to solve the problems of poor corrosion resistance of NdFeB permanent magnets and further improve the corrosion resistance and service temperature of electrophoretic organic coatings

Method used

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  • Preparation method of particle-enhanced organic anticorrosive coating on surface of neodymium-iron-boron permanent magnet material
  • Preparation method of particle-enhanced organic anticorrosive coating on surface of neodymium-iron-boron permanent magnet material

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Embodiment 1

[0023] The preparation method of the particle-reinforced organic anti-corrosion coating on the surface of the NdFeB permanent magnet in this embodiment is carried out according to the following steps:

[0024] (1) Chamfering and polishing: use mechanical vibrating and rolling chamfering methods to perform surface polishing on 38SH sintered NdFeB permanent magnets, and the final size is 25×12×3mm;

[0025] (2) Degreasing and degreasing: put the chamfered magnet into a 60°C alkaline degreasing agent (the main components are sodium carbonate, sodium phosphate, sodium silicate and emulsifier, etc.) for 5 minutes to degrease and degrease;

[0026] (3) Pickling and derusting: add 10% HNO 3 The solution is pickled and derusted for 10s;

[0027] (4) Surface phosphating: put the permanent magnet after pickling and derusting into the zinc-based phosphating solution for phosphating treatment at a medium temperature of 60-70°C for 2 minutes;

[0028] (5) Cathodic electrophoresis: Put th...

Embodiment 2

[0032] The preparation method of the particle-reinforced organic anti-corrosion coating on the surface of the NdFeB permanent magnet in this embodiment is carried out according to the following steps:

[0033] (1) Chamfering and polishing: use mechanical vibrating and rolling chamfering methods to perform surface polishing on 30EH sintered NdFeB permanent magnets, and the final size is 40×50×10mm;

[0034] (2) Degreasing and degreasing: put the chamfered magnet into a 60°C alkaline degreasing agent (mainly sodium carbonate, sodium phosphate, sodium silicate and emulsifier, etc.) for 5 minutes to degrease and degrease;

[0035] (3) Pickling and rust removal: put in 0.25mol / L sulfuric acid solution for pickling and rust removal for 10s;

[0036] (4) Surface phosphating: Put the permanent magnet after pickling and derusting into zinc-based phosphating solution for surface phosphating at 60-70°C for 2 minutes;

[0037] (5) Cathodic electrophoresis: put the phosphating permanent m...

Embodiment 3

[0041] The preparation method of the particle-reinforced organic anti-corrosion coating on the surface of the NdFeB permanent magnet in this embodiment is carried out according to the following steps:

[0042] (1) Chamfering and polishing: use mechanical vibrating and rolling chamfering methods to perform surface polishing on 30EH sintered NdFeB permanent magnets, and the final size is 40×50×10mm;

[0043] (2) Degreasing and degreasing: put the chamfered magnet into a 60°C alkaline degreasing agent (mainly sodium carbonate, sodium phosphate, sodium silicate and emulsifier, etc.) for 5 minutes to degrease and degrease;

[0044] (3) Pickling and rust removal: put in 0.25mol / L sulfuric acid solution for pickling and rust removal for 10s;

[0045] (4) Surface phosphating: Put the permanent magnet after pickling and derusting into zinc-based phosphating solution for surface phosphating at 60-70°C for 2 minutes;

[0046] (5) Cathodic electrophoresis: put the phosphating permanent m...

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Abstract

The invention relates to a preparation method of a particle-enhanced organic anticorrosive coating on the surface of a neodymium-iron-boron permanent magnet material, and specifically relates to a cathode electrophoresis coating method of the particle-enhanced organic anticorrosive coating on the surface of the neodymium-iron-boron permanent magnet material. According to the invention, first, the surface of the neodymium-iron-boron permanent magnet material is polished; the surface of the neodymium-iron-boron permanent magnet material is subject to degreasing, rust removing by acid cleaning, surface phosphorizing, cathode electrophoresis coating and high-temperature curing, such that a particle-enhanced organic matter coating is formed on the surface of the neodymium-iron-boron permanent magnet material. According to the coating provided by the invention, epoxy resin, acrylic acid and polyurethane are adopted as substrates; micro-nano titanium oxide particles, alumina particles, graphite particles, aluminum particles and the like are adopted as enhancing phases, such that a composite organic coating can be prepared. The coating causes no influence on the inherent magnetic performance of the magnet. The coating has a good bonding force with the magnet, and has a good caking property with bonding glue. The coating is also advantaged in uniform thickness, smooth surface, high corrosion resistance, and low preparation cost.

Description

technical field [0001] The invention relates to the field of surface electrochemical treatment of materials, in particular to a cathodic electrophoretic coating method for particle-reinforced organic anti-corrosion coatings on the surface of NdFeB permanent magnet materials. Background technique [0002] Since its birth in 1983, NdFeB permanent magnets have been widely used in microwave technology, audio-visual technology, electrical engineering, instrument technology, computer technology, magnetic separation technology, biotechnology, automobile industry and other fields due to their outstanding magnetic properties. It has become an important part of national economic development. However, its poor corrosion resistance greatly limits its application range. Therefore, how to improve its corrosion resistance has become an important issue in the production and use of NdFeB materials. At present, the treatment methods for improving the corrosion resistance of NdFeB permanen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D13/06C25D13/10C25D13/20
Inventor 钟震晨徐吉林罗军明马胜灿
Owner NANCHANG HANGKONG UNIVERSITY
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