Improved Corrosion Resistance of Co,Al-Alloyed NdFeB Magnetic Nanostructures Processed by Microwave Synthesis Techniques.

Co,Al-alloyed NdFeB nanostructures were synthesized by microwave combustion, followed by the reduction–diffusion process. Al and Nd substitution of Fe improved the corrosion resistance of nanostructured Nd20Fe54Co15Al3B8. The corrosion resistance value was comparable to those of sintered NdFeB magnets. X-ray diffraction and TEM revealed a multiphase system and the presence of Nd-rich phase. The $2~\mu \text{m}$ -thick Ni plating improved corrosion potential to −0.77 and −0.74 V, respectively, and current density to 329 and $144~\mu \text{A}$ /cm2, respectively. The $10~\mu \text{m}$ -thick Ni plating provided a high degree of protection against corrosion. [ABSTRACT FROM AUTHOR]