| 摘要 |
PURPOSE:To improve corrosion resistance in terms of both a magnet material and a coating method by providing an anisotropically sintered magnet containing one or two of R, B, Co and Cr, and M, Fe and unavoidable impurities by specific atomic percentages respectively, and coating the surface of the sintered magnet having 95% or larger of true density with a film containing oxidation resistance and corrosion resistance. CONSTITUTION:An Nd-Fe-B rare earth element anisotropic magnet composition having corrosion resistance desirably contains one or more of rare earth elements of Y, La, Co, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Tb and Lu including R, its content is 13-15% of atomic percentage. 6-8% of B, and 1-5% of one or two of Co, Cr. Element M is 0.5-2% of one or two or more of Al, Nb, Mo, Ti, and the residue is Fe and unavoidable impurities. The surface of the sintered material of 95% or larger of true density is coated with a film having oxidation resistance and corrosion resistance. The film has corrosion resistance and is made of one selected from electrolytic Ni plating, electroless Ni plating and epoxy resin electrodeposited film of zinc phosphate base. |
