Jing Chen,Bajin Xu,Guoping Ling Department of Materials Science and Engineering Zhejiang University Hangzhou,China
Feasibility of improving the corrosion resistance of NdFeB magnets by electrodeposition from room temperature ionic liquid has been studied.Specifically,we electroplated aluminum coating on NdFeB magnets using the acidic aluminum chloride 1-ethyl-3-methylimidazolium chloride (AlCl3-EMIC) ionic liquid.The morphology and chemical composition of the coating were investigated using SEM microscopy coupled with EDX microanalysis.The adhesions between coating and NdFeB substrate were estimated by mechanical scratch test and thermal shock test.The corrosion resistance of the coating was evaluated by open circuit potential and potentiodynamic polarization measurements in 3.5 wt.% NaCl solution and neutral salt spray test.The results show that a dense,adherent and thickness- controllable aluminum coating can be electrodeposited on NdFeB magnets in the acidic AlCl3-EMIC ionic liquid at room temperature after anodic etching.The Al coating has a good protective ability to NdFeB magnets.
NdFeB;room temperature ionic liquid;electrodeposition of aluminum;anodic etching;corrosion resistance
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