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

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Table 1. The corrosion potential Ecorr, corrosion current density icorr and Tafel slope b of NdFeB sintered magnets tested in 2.5 wt.% NaCl aqueous solutions
Figure 2. Mass loss of the NdFeB sintered magnets measured in 120℃, 2 bar and 100% relative humidity atmosphere for different times
Figure 4. Demagnetization curves of the starting magnet (a), the magnet with 0.85 wt.% Zr and 0.15 wt.% Cu co-addition (b) and the magnet with 1.0 wt.% Zr addition (c)
Figure 5. Temperature dependence of coercivity for the NdFeB sintered magnets.

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