The effect of Nb and Ga addition on the corrosion resistance of Nd‐Fe‐B permanent magnets in acidic environments

Abstract

This paper describes the effect of alloying elements such as Nb and Ga on the corrosion behaviour of Nd‐Fe‐B permanent magnetic alloy. The results revealed that the alloying elements are not helpful in improving the corrosion resistance of the base magnet; rather their presence makes the base alloy highly vulnerable to corrosion in acidic environments. In particular, Nb addition is more detrimental to corrosion as was evidenced by potentiodynamic, cyclic polarisation, E_corr vs time, electrochemical impedance and SEM results. The studies also showed that the degradation of the alloys with and without alloying addition takes place due to preferential dissolution of grain boundaries.

Citation

Gurappa, I. (2004), "The effect of Nb and Ga addition on the corrosion resistance of Nd‐Fe‐B permanent magnets in acidic environments", Anti-Corrosion Methods and Materials, Vol. 51 No. 1, pp. 31-40. https://doi.org/10.1108/00035590410512717