LAUSR

Abstract Sintered (Ce, Nd)-Fe-B magnets with high cost performance were prepared by substituting of Ce for Nd with the dual-main phase method. The corrosion behaviors of dual-main phase sintered (CexNd1–x)30Fe69B1 (x = 0.15 wt%, 0.3 wt%) magnets, which were named as Ce15 and Ce30, were studied in 3.5 wt% NaCl, 6.6 wt% Na2SO4 and 3.0 wt% NaOH aqueous solutions, respectively. The galvanic corrosion of Ce30 is stronger than that of Ce15. However, the mass loss value of Ce30 is smaller than Ce15 after free corrosion for 33 d in NaCl solution. In the other two solutions, all the results show that the corrosion resistance of Ce30 is better than that of Ce15. The scanning electron microscope results show that the crack and shedding of the magnetic phase of Ce30 is less than that of Ce15. Combined above, the abnormal corrosion behavior shows that Ce30 magnets perform better corrosion resistance than Ce15, and the degradation degree of magnetic phase mainly affects the corrosion resistance of magnets.