Study on the corrosion behavior of NdFeB permanent magnets in nitric acid and oxalic acid solutions with electrochemical techniques

Corrosion behavior of sintered NdFeB magnets in nitric acid and oxalic acid was investigated. The experiment results indicated that NdFeB is strongly corroded in nitric acid solution, and is passivated in oxalic acid solution. Based on the corrosion behavior, the possible corrosion mechanisms are discussed.