Patent ID: 7473343
Filing Date: 2009-01-06
Classification: C25D,H01F

Abstract:
1. A method of manufacturing a rare-earth magnet, comprising the steps of: electroplating a first protective film including nickel on a magnet body including a rare-earth element with a first plating bath of a water solution, the first plating bath consisting of a nickel source, a conductive salt, a pH stabilizer, and a semi-brightener 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, the nickel source is selected from the group consisting of nickel sulfate, nickel chlorides and nickel bromides and the pH stabilizer is selected from the group consisting of boric acid, sodium borate, potassium borate, lithium borate and magnesium borate; and forming a second protective film including nickel and sulfur on the first protective film.