Title :
Corrosion kinetics of spark plasma sintering Nd-Fe-B magnets in different electrolytes
Author :
Yue, M. ; Zhang, J.X. ; Liu, W.Q. ; Wang, G.P.
Author_Institution :
Key Lab. of Adv. Functional Mater., Beijing Univ. of Technol., China
Abstract :
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 H2SO4 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.
Keywords :
corrosion; corrosion testing; electrochemical impedance spectroscopy; ferromagnetic materials; iron compounds; neodymium compounds; plasma materials processing; reaction kinetics; sintering; H2SO4; NaCl; NaOH; Nd2Fe14B; absorption resistance; acidic solution; alkaline solution; anodic potentiodynamic polarization; corrosion kinetics; electrochemical impedance spectroscopy; electrolytes; saline solution; spark plasma sintered Nd-Fe-B magnets; Corrosion; Current density; Equivalent circuits; Grain boundaries; Kinetic theory; Magnets; Microstructure; Plasmas; Polarization; Sparks;
Conference_Titel :
Magnetics Conference, 2005. INTERMAG Asia 2005. Digests of the IEEE International
Print_ISBN :
0-7803-9009-1
DOI :
10.1109/INTMAG.2005.1464078
