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A kind of surface passivation treatment method of r-t-b series sintered permanent magnet

A technology of R-T-B and passivation treatment, which is applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., can solve the problems of complex process, harsh working environment, and less treatment process, so as to improve production efficiency and reduce production Links, the effect of ensuring quality stability

Active Publication Date: 2015-11-25
BEIJING ZHONG KE SAN HUAN HI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few bluish (black) treatment processes applied to R-T-B sintered permanent magnets, and the process is complicated and the working environment is harsh.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Put the R-T-B series sintered permanent magnets that have gone through the pretreatment stages (including mechanical cleaning, alkaline degreasing, ultrasonic cleaning, pickling and derusting, ultrasonic cleaning, alcohol dehydration and drying) into the surface treatment experiment box (by Japan Taba EHS-221M type high-speed aging test box produced by ESPEC Co., Ltd.), and the surface passivation treatment was carried out for 3 hours under the conditions that the temperature was 100°C, the humidity was 50RH%, and the pressure was 0.5atm. Then carry out salt spray test and damp heat test to the R-T-B system sintered permanent magnet through this surface passivation treatment, wherein, salt spray test is carried out in the SQ-800-ST type salt water spray test box that Sakahashi Co., Ltd. produces; It is carried out in the PL-2KP type alternating damp heat test chamber produced by Japan Tabai ESPEC Co., Ltd. In addition, the demagnetization rate at high temperature was al...

Embodiment 2

[0023] Put the R-T-B series sintered permanent magnets that have gone through the pretreatment stages (including mechanical cleaning, alkaline degreasing, ultrasonic cleaning, pickling and derusting, ultrasonic cleaning, alcohol dehydration and drying) into the surface treatment experiment box (by Japan Taba EHS-411M high-speed aging test box produced by ESPEC Co., Ltd.), and the surface passivation treatment was carried out for 0.5 hours under the conditions that the temperature was 160°C, the humidity was 80RH%, and the pressure was 5atm.

[0024] Then carry out salt spray test and damp heat test to the R-T-B system sintered permanent magnet through this surface passivation treatment, wherein, salt spray test is carried out in the SQ-800-ST type salt water spray test box that Sakahashi Co., Ltd. produces; It is carried out in the PL-2KP type alternating damp heat test chamber produced by Japan Tabai ESPEC Co., Ltd. In addition, the demagnetization rate at high temperature wa...

Embodiment 3

[0026] Put the R-T-B series sintered permanent magnets that have gone through the pretreatment stages (including mechanical cleaning, alkaline degreasing, ultrasonic cleaning, pickling and derusting, ultrasonic cleaning, alcohol dehydration and drying) into the surface treatment experiment box (by Japan Taba EHS-211M high-speed aging test box produced by ESPEC Co., Ltd.), and the surface passivation treatment was carried out for 2 hours under the conditions that the temperature was 120°C, the humidity was 100RH%, and the pressure was 2atm.

[0027] Then carry out salt spray test and damp heat test to the R-T-B system sintered permanent magnet through this surface passivation treatment, wherein, salt spray test is carried out in the SQ-800-ST type salt water spray test box that Sakahashi Co., Ltd. produces; It is carried out in the PL-2KP type alternating damp heat test chamber produced by Japan Tabai ESPEC Co., Ltd. In addition, the demagnetization rate at high temperature was...

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PUM

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Abstract

The invention provides a surface passivation treatment method for an R-T-B series sintered permanent magnet. The surface passivation treatment method comprises a pretreatment stage and a surface passivation treatment stage, wherein the pretreatment stage comprises the steps of mechanical cleaning, alkaline degreasing, ultrasonic cleaning, rust removal through pickling, ultrasonic cleaning, alcohol dehydration and drying; and the surface passivation treatment stage comprises the step of placing the pretreated R-T-B series sintered permanent magnet in the environment with 100-160 DEG C temperature, 50-100 RH% humidity and 0.5-5 atm pressure for 0.5-3 h. With the surface passivation treatment method for an R-T-B series sintered permanent magnet provided by the invention, the production links can be obviously reduced, the production efficiency is improved, the quality stability of a surface passivating film can be effectively ensured, and the corrosion resistance of the product is obviously improved.

Description

technical field [0001] The invention relates to a surface passivation treatment method of a permanent magnet, in particular to a surface passivation treatment method of an R-T-B system sintered permanent magnet. Background technique [0002] The surface protection treatment of R-T-B series sintered permanent magnets is mainly to implement a protective layer on the surface. Corrosion-resistant protective layers mainly include metal coatings, polymer coatings, conversion coatings and composite coatings. In short-term rust prevention, the method of implementing a conversion coating layer is usually used for protection. At present, in the conversion coating treatment of rare earth permanent magnet materials, the phosphating treatment process is mainly used. However, the phosphating film is easily affected by factors such as pretreatment process, phosphating solution composition, phosphating film forming temperature, and time, and is not stable enough. [0003] Blue (black) tr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/18C23C8/02C23C8/80
Inventor 薛慧力陈国安左季敏金国顺饶晓雷胡伯平
Owner BEIJING ZHONG KE SAN HUAN HI TECH
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