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A method for surface treatment of chrome-free zinc coating for NdFeB permanent magnet materials

A permanent magnet material and surface treatment technology, applied in anti-corrosion coatings, metal-free paints, etc., can solve problems such as easy rust and corrosion, magnetic performance decline or damage, and poor corrosion resistance of NdFeB alloys, etc., to achieve High corrosion resistance, easy handling, and the effect of improving anti-corrosion performance

Active Publication Date: 2017-03-22
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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  • A method for surface treatment of chrome-free zinc coating for NdFeB permanent magnet materials
  • A method for surface treatment of chrome-free zinc coating for NdFeB permanent magnet materials

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0021] Polish 2.3 kg of 8*8*7mm sintered NdFeB permanent magnet material in a vibration mill for 2 hours. After degreasing with sodium phosphate 20g / liter, sodium carbonate 10g / liter and sodium hydroxide 10g / liter, blow dry. For sandblasting, please refer to the surface pretreatment method (CN101373650A) of the dry sandblasting NdFeB permanent magnet material applied by the inventor in 2007 for ultrasonic washing. The chromium-free zinc-aluminum liquid is by weight percentage: 35% of flaky zinc powder (the particle size of zinc powder is 800 mesh), 5% of flaky aluminum powder (the particle size of aluminum powder is 800 mesh), 0.15% of polytetrafluoroethylene (polytetrafluoroethylene The particle size of tetrafluoroethylene is 400 mesh), magnesia 0.15% (the particle size of magnesium oxide is 120 mesh), hydrocarbon methyl cellulose 3%, polyethylene glycol 1%, alkylphenol polyoxyethylene ether 2%, 601 Epoxy resin 8%, silane coupling agent KH-5501%, phytic acid 1%, the rest is ...

Embodiment 2

[0024] Put 2.3 kg of sintered NdFeB permanent magnet material of 24*99*7mm in the vibration mill for 2 hours. After degreasing with sodium phosphate 20g / liter, sodium carbonate 10g / liter and sodium hydroxide 10g / liter, blow dry. For sandblasting, please refer to the surface pretreatment method (CN101373650A) of the dry sandblasting NdFeB permanent magnet material applied by the inventor in 2007 for ultrasonic washing. The chromium-free zinc-aluminum liquid is as follows by weight percentage: the content of flaky zinc powder is 20% (the particle size of zinc powder is 1000 mesh), the content of flaky aluminum powder is 10% (the particle size of aluminum powder is 1000 mesh), and the content of tin powder is 1% (tin powder is 1000 mesh). Powder particle size is 400 mesh), polytetrafluoroethylene 4% (polytetrafluoroethylene particle size is 200 mesh), hydrocarbon methyl cellulose 1%, polyethylene glycol 1%, alkylphenol polyoxyethylene ether 2% , 14% of 604 epoxy resin, 1% of sil...

Embodiment 3

[0027] Polish 2.3 kg of D24.99*7mm sintered NdFeB permanent magnet material in a vibration mill for 2 hours. After degreasing with sodium phosphate 20g / liter, sodium carbonate 10g / liter and sodium hydroxide 10g / liter, blow dry. For sandblasting, please refer to the surface pretreatment method (CN101373650A) of the dry sandblasting NdFeB permanent magnet material applied by the inventor in 2007 for ultrasonic washing. The chromium-free zinc-aluminum liquid is as follows by weight percentage: the content of flaky zinc powder is 30% (the particle size of zinc powder is 900 mesh), the content of flaky aluminum powder is 10% (the particle size of aluminum powder is 900 mesh), and the content of magnesium powder is 0.15%. (the particle size of magnesium powder is 150 mesh), polytetrafluoroethylene 4.5% (polytetrafluoroethylene particle size is 300 mesh), hydrocarbon methyl cellulose 3%, polyethylene glycol 1%, alkylphenol polyoxyethylene ether 2%, 607 epoxy resin 15%, silane coupli...

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Abstract

The invention discloses a surface treatment method for a chromium and zinc-free coating of a neodymium-iron-boron permanent magnet material. The method comprises the following steps of: performing chamfering, polishing, degreasing, oil removing, sand blasting, derusting and chromium, zinc and aluminum-free coating treatment; and performing zinc-aluminum coating treatment on the surface of the neodymium-iron-boron permanent magnet material by using a chromium, zinc and aluminum-free solution, wherein the chromium, zinc and aluminum-free solution comprises metal powder, inorganic powder, organic powder, hydrocarbon methylcellulose, polyethylene glycol, alkyl phenyl polyoxyethylene ether, an epoxy resin, a silane coupling agent, phytic acid and the balance of ethanol; the metal powder comprises zinc powder and aluminum powder; the inorganic powder comprises magnesium powder, tin powder, tin dioxide or magnesium oxide; and the organic powder comprises polyfluortetraethylene. The surface treatment method has the advantages of easiness for treating, quickness, environmental friendliness and high corrosion resistance.

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, in particular, the invention relates to a surface treatment method for chromium-free zinc coatings of NdFeB permanent magnet materials . Background technique [0002] In recent years, the application and development of neodymium iron boron (NdFeB) permanent magnet materials is very rapid, and the success of the protection of NdFeB permanent magnet materials is related to one of the key technologies whether the material can be popularized and applied. 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D5/38C09D5/08
Inventor 白晓刚潘广麾仉新功冯志兵
Owner BEIJING ZHONG KE SAN HUAN HI TECH
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