Surface passivation treatment method for R-T-B series sintered permanent magnet

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, a...

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Bibliographische Detailangaben
Hauptverfasser:	JIN GUOSHUN, ZUO JIMIN, CHEN GUOAN, XUE HUILI, HU BOPING, RAO XIAOLEI
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL DIFFUSION TREATMENT OF METALLIC MATERIAL INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL METALLURGY SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION
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Beschreibung
Zusammenfassung:	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.