Magnet surface treatment method

The invention provides a magnet surface treatment method which comprises: a step of pretreatment of a magnet to be treated; and a step of removing a defective layer on the magnet to be treated by using a pickling solution. The pickling solution is prepared by mixing nitric acid and water; the magnet...

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Bibliographische Detailangaben
Hauptverfasser:	JIN GUOSHUN, XUE HUILI, JIANG BING, SUN QIHUI
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMICAL SURFACE TREATMENT CHEMISTRY CLEANING OR DEGREASING OF METALLIC MATERIAL BY CHEMICALMETHODS OTHER THAN ELECTROLYSIS COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR 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
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Beschreibung
Zusammenfassung:	The invention provides a magnet surface treatment method which comprises: a step of pretreatment of a magnet to be treated; and a step of removing a defective layer on the magnet to be treated by using a pickling solution. The pickling solution is prepared by mixing nitric acid and water; the magnet to be treated is pickled by the pickling solution, and then is subjected to ultrasonic cleaning in water; the above process is repeated at least twice. The magnet surface treatment method provided by the invention can well remove the defective layer on the surface of a sintered rare earth R-Fe-B permanent magnet, thus significantly improve the product corrosion resistance, and prolong the service life.