Title:
SURFACE TREATMENT METHOD FOR PERMANENT MAGNET, PERMANENT MAGNET AND PROTECTIVE FILM THEREOF
Document Type and Number:
WIPO Patent Application WO/2024/087548
Kind Code:
A1
Abstract:
Disclosed in the present invention are a surface treatment method for a permanent magnet, a permanent magnet and a protective film thereof. The surface treatment method for a permanent magnet comprises the following steps: S1, carrying out zirconization treatment on a permanent magnet to obtain a permanent magnet having a zirconium film, wherein the zirconization treatment is carried out at a temperature of 5-40℃ and a pH value of 1.5-6 for 5-30 min; and S2, carrying out passivation treatment on the permanent magnet having the zirconium film, and drying the permanent magnet, wherein the passivation treatment is carried out at a temperature of 15-50℃ and a pH value greater than or equal to 10 for 4-12 min. According to the treatment method of the present invention, the obtained permanent magnet has relatively good moisture resistance and relatively large surface tension; and the treatment method of the present invention reduces pollutant emission, and conforms to the concept of green ecological and environmentally friendly production.
Inventors:
ZHANG YANYAN (CN)
LIANG YAMIN (CN)
FU DONGHUI (CN)
LAI HUOXIU (CN)
HUANG JIAYING (CN)
LIANG YAMIN (CN)
FU DONGHUI (CN)
LAI HUOXIU (CN)
HUANG JIAYING (CN)
Application Number:
PCT/CN2023/090163
Publication Date:
May 02, 2024
Filing Date:
April 23, 2023
Export Citation:
Assignee:
FUJIAN GOLDEN DRAGON RARE EARTH CO LTD (CN)
International Classes:
C23C22/80; C23C22/60; H01F41/02
Attorney, Agent or Firm:
G & W PARTNERS (CN)
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