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Organic sealing of bonded neodymium-iron-boron magnet and cathodic electrophoretic composite surface protection technology

A cathodic electrophoresis and composite surface technology, which is applied in electrophoretic plating, magnetic objects, permanent magnet manufacturing, etc., can solve the problems of large difference in surface electrophoretic activity, accumulation of impurity ions, increase in solution conductivity, etc., and achieve appearance and insulation performance Good, simple sealing process, excellent corrosion resistance

Inactive Publication Date: 2007-08-08
WUHAN RES INST OF MATERIALS PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the special features of NdFeB magnets, such as high resistance, high porosity, large difference in surface electrophoretic activity, accumulation of magnets in the bath solution, lead to accumulation of impurity ions, and increased conductivity of the solution limit the electrophoresis during the coating process. The increase of voltage makes the thickness of the coating film low (≤20um) and it is difficult to ensure uniformity, and it is easy to cause defects such as fish eyes and bubbles in the coating film
Japanese patent Jp 005428 / 2000 introduces an impregnating agent or anaerobic resin impregnation sealant organic sealing agent to seal the surface of the magnet. It first protects the electroplating layer of the magnet, and then protects the porous electroplating layer. The hole sealing treatment only blocks the pores of the protective electroplating layer on the surface of the magnet, but the pores of the magnet itself have not been effectively blocked, and there is no additive to improve corrosion resistance in the sealing agent, so the sealing The effect of porosity in NdFeB magnets is not significant

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Immerse 1Kg of φ25×15 bonded NdFeB magnet material in the organic material of anaerobic impregnating agent, put it into a vacuum kettle, evacuate to above 750mmHg, and continue for 10-15min. Take out the test piece and rinse it with water. After curing in water-curing medium at 90°C for 2-5 minutes, after phosphating and washing with water, cathodic electrophoresis coating is carried out: the initial voltage of cathodic electrophoresis is 80-90V, the deposition voltage is 140-160V, the electrophoresis temperature is 28-30°C, and the electrophoresis time It is 150-180s, and then cured after washing, that is, first baked at 80°C for 20-30 minutes, and then baked at 170°C for 30 minutes to complete the curing. That is, the bonded NdFeB magnet product that has been sealed with anaerobic impregnating agent and compounded with cathodic electrophoretic coating film protection is obtained. The corrosion resistance test of this NdFeB magnetic ring protective coating is carried o...

Embodiment 2

[0047] Immerse 1Kg of φ25×15 bonded NdFeB material into the organic material of the fast-curing impregnating agent, put it in a vacuum kettle, and evacuate it to above 750mmHg for 10-15min. After curing in the water-curing medium for 2-5 minutes, after phosphating and washing with water, cathodic electrophoresis coating is carried out: the initial voltage of cathodic electrophoresis is 80-90V, the deposition voltage is 140-160V, the electrophoresis temperature is 28-30°C, and the electrophoresis time is 150- 180s, washed with water, and then cured: first bake at 80°C for 20-30 minutes, then bake at 170°C for 30 minutes to complete curing. That is to say, a bonded NdFeB magnet product that has been sealed with a fast-curing impregnating agent and compositely protected by a cathodic electrophoretic coating film is obtained. The corrosion resistance test of this NdFeB magnetic ring protective coating is carried out, and the results meet the following indicators:

[0048] 3% by w...

Embodiment 3

[0052]Immerse 1Kg of φ25×15 bonded NdFeB materials into a fast-curing impregnating agent organic sealing agent containing additives of 0.5% barium petroleum sulfonate, 0.1% dodecylamine, and 0.2% cyclohexanediamine, and place it in a vacuum In the kettle, evacuate to above 750mmHg for 10-15 minutes, take out the test piece and rinse it with water, cure it in a water-curing medium at 90°C for 2-5 minutes, then phosphate and wash it with water, and then carry out cathodic electrophoretic coating: cathode The initial electrophoresis voltage is 80-90V, the deposition voltage is 140-160V, the electrophoresis temperature is 28-30°C, and the electrophoresis time is 150-180s. After washing, then curing: first bake at 80°C for 20-30 minutes, then bake at 170°C for 30 minutes. That is to say, the bonded NdFeB magnetic product that has been sealed with a fast-curing impregnating agent containing corrosion-inhibiting additives and compositely protected by cathodic electrophoretic coatings ...

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PUM

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Abstract

The invention relates to one compound surface protection technique to add Ferro-magnet organic sealing hole and cathode electrophoresis, which adopts relative buffer erosion oilchromium sulfonate for 0.2%-1.5%, dodecyl amine for 0.1%-1%, cyclohexadiene for0.2%-1.5%; oleic acid, decanedioic acid and octadecyl amine reaction for0.1%-0.5% impregnant or rapid fix impregnant, wherein, in vacuum condition, it processes sealing hles and then for electrophoresis coating compound surface.

Description

technical field [0001] The invention discloses an organic sealing and cathodic electrophoresis composite surface protection technology for bonding NdFeB magnets, which belongs to the technical field of porous NdFeB surface protection, and in particular relates to a surface protection method for bonding NdFeB magnets. Background technique [0002] As the third-generation rare earth permanent magnet material, NdFeB has excellent magnetic properties and high cost performance, so it has achieved rapid development in scientific research, production and application in recent years. Widely used in high-tech fields such as electronic appliances, machinery and medical equipment, automobiles, and aviation. With the continuous improvement of its performance, new application growth points continue to emerge, especially the development of knowledge economy represented by the information industry. Functional materials such as permanent magnets continue to bring new uses. [0003] However...

Claims

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Application Information

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IPC IPC(8): H01F41/02H01F1/057H01F1/08B22F3/26C25D13/00
CPCH01F41/026
Inventor 邱大健肖祥定倪晓雪赵定义谢鸽平
Owner WUHAN RES INST OF MATERIALS PROTECTION
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