The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 06, 2009
Filed:
Mar. 01, 2004
Takeshi Sakamoto, Tokyo, JP;
Yasuyuki Nakayama, Tokyo, JP;
Tatsuhiro Iwai, Tokyo, JP;
Tomomi Yamamoto, Tokyo, JP;
Takeshi Sakamoto, Tokyo, JP;
Yasuyuki Nakayama, Tokyo, JP;
Tatsuhiro Iwai, Tokyo, JP;
Tomomi Yamamoto, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
Provided are a method of manufacturing a rare-earth magnet with superior corrosion resistance, and a plating bath used for the method. A first protective film including nickel and a second protective film including nickel and sulfur are laminated in order on a magnet body including a rare-earth element. The first protective film is formed through electroplating with a first plating bath including a nickel source, a conductive salt and a pH stabilizer, and having a concentration of the nickel source of 0.3 mol/l to 0.7 mol/l on a nickel atom basis and a conductivity of 80 mS/cm or over. Thereby, a rare-earth-rich phase can be prevented from being leached out, and the production of pinholes can be reduced. Therefore, the corrosion resistance of the rare-earth magnet can be improved.