EP 1032000 A1 20000830 - CORROSION-RESISTANT PERMANENT MAGNET AND METHOD FOR PRODUCING THE SAME
Title (en)
CORROSION-RESISTANT PERMANENT MAGNET AND METHOD FOR PRODUCING THE SAME
Title (de)
KORROSIONSRESISTENTE DAUERMAGNET UND IHRES HERSTELLUNGSVERFAHREN
Title (fr)
AIMANT PERMANENT RESISTANT A LA CORROSION ET SON PROCEDE DE FABRICATION
Publication
Application
Priority
- JP 9904915 W 19990910
- JP 25651698 A 19980910
Abstract (en)
The present invention provides an Fe-B-R based permanent magnet, which has a chemical conversion coating film formed on its surface with an aluminum film interposed therebetween, the chemical conversion coating film containing at least one of titanium and zirconium, phosphorus, oxygen and fluorine as constituting elements, and a process for producing such an Fe-B-R based permanent magnet. In the permanent magnet, the chemical conversion coating film is adhered firmly to the magnet with the aluminum film interposed therebetween and hence, the magnet is excellent in corrosion resistance. Even if the magnet is left to stand for a long time under high-temperature and high-humidity conditions of a temperature of 80 DEG C and a relative humidity of 90 %, the magnet exhibits a stable high magnetic characteristic which cannot be deteriorated. Moreover, the film is free from hexa-valent chromium.
IPC 1-7
IPC 8 full level
H01F 41/02 (2006.01)
CPC (source: EP)
H01F 41/026 (2013.01)
Designated contracting state (EPC)
DE GB
DOCDB simple family (publication)
EP 1032000 A1 20000830; EP 1032000 A4 20030502; EP 1032000 B1 20040714; DE 69918660 D1 20040819; DE 69918660 T2 20050728; HK 1027207 A1 20010105; WO 0016347 A1 20000323
DOCDB simple family (application)
EP 99943247 A 19990910; DE 69918660 T 19990910; HK 00106159 A 20000928; JP 9904915 W 19990910