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Corrosion kinetics of spark plasma sintering Nd-Fe-B magnets in different electrolytes

Anodic potentiodynamic polarization experiments as well as electrochemical impedance spectroscopy tests were carried out to investigate the corrosion kinetics of conventionally sintered and spark plasma sintered (SPS) Nd-Fe-B magnets in different electrolytes. The electrolytes used were NaOH, NaCl and H/sub 2/SO/sub 4/ solutions. Results reveal that in alkaline solution, both magnets exhibit evident passive behavior. In saline and acidic solutions, however, both magnets commit corrosion process. The SPS Nd-Fe-B magnets possess much bigger absorption resistance than conventional sintered one, indicating the former are less incident to absorb the active ions in the solutions and thus possess lower corrosion rate.