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Neodymium-iron-boron magnet zinc plating and cathode electrophoresis composite protection process

A cathodic electrophoresis, NdFeB technology, applied in metal material coating process, superimposed layer plating, coating and other directions, can solve the problem of coating adhesion, corrosion resistance can not be guaranteed, sintered NdFeB magnets have poor corrosion resistance , technical performance can not meet the actual needs and other problems, to achieve the effect of long service life, improved corrosion resistance, and improved corrosion resistance

Inactive Publication Date: 2004-09-15
沈阳工业学院
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  • Abstract
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  • Claims
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Problems solved by technology

[0002] At present, NdFeB magnets are more and more widely used in aviation, aerospace and civil industries. The corrosion resistance of sintered NdFeB magnets is poor. Although the service life of NdFeB magnets can be improved by electroplating or coating protective layers, Increase corrosion resistance, however, these technical properties cannot meet the actual needs of the current market
The main reason is that the pre-treatment and post-treatment methods of NdFeB magnet coating are defective, that is, there is no phosphating treatment, passivation treatment and cathodic electrophoresis process after galvanizing in the prior art, so that the bonding force and corrosion resistance of the coating Can not guarantee

Method used

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  • Neodymium-iron-boron magnet zinc plating and cathode electrophoresis composite protection process

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Embodiment Construction

[0013] Such as figure 1 As shown, in conjunction with the embodiment, further illustrate the method for electro-galvanizing and cathodic electrophoresis composite protection of NdFeB magnets, the specific steps are as follows:

[0014] (1) High-temperature baking degreasing: bake the workpiece at 200°C for 1 hour to remove the oil on the surface of the workpiece and eliminate the magnetism of the material;

[0015] (2) Boiling water sealing: NdFeB matrix has a loose structure and many pores. In order to prevent the NdFeB matrix from infiltrating the pores during degreasing, rust removal, electroplating and cathodic electrophoresis, the acid and alkali and bath solution will be stored in the coating. There is a corrosive medium, and the bonding surface between the substrate and the coating is gradually corroded and pulverized during use, causing the coating to fall off, so the boiling water sealing treatment is selected. Put the workpiece into boiling water (distilled water or...

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Abstract

The invention is a kind of zinc coating and catelectrode electrophoresis compound protection method for neodymium iron boron magnet. The technology point is the combination of catelectrode electrophoresis technology and zinc coating technology, and that it carries on parkerising and passivating process after zinc coating, the process includes following steps: (1) high temperature baking deoil; (2) boiled water sealing (3) deoil; (4) rust cleaning; (5) activating; (6) cold galvanizing; (7) parkerising; (8) passivating; (9) catelectrode electrophoresis. The merits of the invention are: combines the zinc coating and catelectrode electrophoresis, and carries on parkerising process after zinc coating, it enhances the corrosion resisting and water enduring and adhesion propery of neodymium iron boron, the corrosion resisting effect is prominent, and prolongs the operating life to 4-5times.

Description

technical field [0001] The invention relates to a sintered NdFeB magnet electroplating composite protection technology, in particular to a process method of galvanizing and cathodic electrophoresis composite protection for an NdFeB magnet. Background technique [0002] At present, NdFeB magnets are more and more widely used in aviation, aerospace and civil industries. The corrosion resistance of sintered NdFeB magnets is poor. Although the service life of NdFeB magnets can be improved by electroplating or coating protective layers, To increase corrosion resistance, however, these technical properties cannot meet the actual needs of the current market. The main reason is that the pre-treatment and post-treatment methods of NdFeB magnet coating are defective, that is, there is no phosphating treatment, passivation treatment and cathodic electrophoresis process after galvanizing in the prior art, so that the bonding force and corrosion resistance of the coating Can not guarant...

Claims

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Application Information

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IPC IPC(8): C23C28/00
Inventor 赵春英任广军文松林谭勇付岩
Owner 沈阳工业学院
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