研究了Cu/Al复合添加对(Pr,Nd)_12.8Dy_1.0Fe_balNb_0.1B_6.0(at%)烧结磁体抗腐蚀性和磁性的影响。结果表明:添加0.6 at%Al和0.2 at%Cu时磁体的抗腐蚀性最强,磁体在0.001 mol/L HCl溶液中的腐蚀电流密度从46.90 μA·cm^-2降低到11.14 μA·cm^-2,在湿热环境中腐蚀100 h的质量损失从13.2 mg·cm^-2降低到0.4 mg·cm^-2。抗腐蚀性的提高源于Cu和Al对富(Pr,Nd)晶界相化学稳定性的提高及其分布状况的改善。同时,Cu/Al对烧结NdFeB晶界结构的优化也有利于磁体磁性能的提高。

Effects of Cu/Al compound addition on the anti-corrosive and magnetic properties (Pr,Nd)_12.8Dy_1.0Fe_balNb_0.1B_6.0(at%) sintered magnets were investigated. It is found that the corrosion current density decreases from 46.90 μA·cm^-2 for the magnet without Cu/Al to 11.14  μA·cm^-2 for the magnet with additions of 0.6 at% Al and 0.2 at% Cu in 0.001 mol/L HCl solutions, the mass loss reduces from 13.2 mg.cm^-2 to 0.4 mg.cm^-2 in hot/humidity atmosphere for 100 h. The 0.6 at% Al- and 0.2 at% Cu-added magnet has the maximum corrosion resistance. The improvement of the corrosion resistance can be ascribed to the enhanced chemical stability and the optimized distribution of (Pr, Nd)-rich grain boundary phase. Additionally, the optical grain boundary microstructure is benefit for the magnetic properties.