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Title:
METHOD FOR PRODUCING RARE-EARTH PERMANENT MAGNET AND METAL PLATING BATH
Document Type and Number:
WIPO Patent Application WO/2004/079055
Kind Code:
A1
Abstract:
A method for producing a rare-earth permanent magnet, which comprises laminating a first protective layer comprising nickel and a second protective layer comprising nickel and sulfur on a magnet base material comprising a rare earth element in this order, wherein the first protective layer is formed through electroplating by using a plating bath comprising a nickel source, an electroconductive salt and a pH stabilizer and having a nickel content of 0.3 mol/l to 0.7 mol/l in terms of a nickel atom and an electroconductivity of 80 mS/cm or more; and a plating bath for use in the method. The method allows the suppression of the elution of a rare-earth rich phase from the magnet base material, resulting in the reduction in the formation of pinholes, which leads to the production of a rare-earth permanent magnet improved in corrosion resistance.

Inventors:
SAKAMOTO TAKESHI (JP)
NAKAYAMA YASUYUKI (JP)
IWAI TATSUHIRO (JP)
YAMAMOTO TOMOMI (JP)
Application Number:
PCT/JP2004/002713
Publication Date:
September 16, 2004
Filing Date:
March 04, 2004
Export Citation:
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Assignee:
TDK CORP (JP)
SAKAMOTO TAKESHI (JP)
NAKAYAMA YASUYUKI (JP)
IWAI TATSUHIRO (JP)
YAMAMOTO TOMOMI (JP)
International Classes:
C25D3/12; C25D5/14; C25D7/00; H01F41/02; (IPC1-7): C25D7/00; C25D5/14; H01F41/02
Foreign References:
JP2002285377A2002-10-03
JPH097810A1997-01-10
JPH07283018A1995-10-27
JPH0491406A1992-03-24
JPH02277794A1990-11-14
Attorney, Agent or Firm:
Mitazaki, Taiji (9-5 Shinjuku 1-chom, Shinjuku-ku Tokyo, JP)
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