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Cu and Zr powders are co-added as intergranular modifiers to improve the corrosion resistance of the NdFeB sintered magnets. Compared with the Cu and Zr free sample, the Ecorr is increased sharply from -0.799 V to -0.697 V for the co-added sample with 0.15 wt.% Cu and 0.85 wt.% Zr, which demonstrate that small additions of Cu and Zr co-added can remarkably improve the electrochemical stability and corrosion resistance in salt solution. Besides, Co and Zr co-addition proved to result in relevant improvement in the magnetic properties, especially in the coercivity Hcj, Hcj was improved from 2000 to 2181 kA/m at room temperature. Further investigation of temperature dependence of coercivity demonstrates that Cu and Zr co-addition sample shows a larger  compared to that of the Cu and Zr free sample.

Improvement of Corrosion Resistance and Magnetic Properties of NdFeB Sintered Magnets with Cu and Zr Co-Added