Electrodeposition of NdFeB films in DMI-LiNO3 ionic liquid analogs at room temperature
The feasibility and reaction mechanism of NdFeB film electrodeposition in 1,3-dimethyl-2-imidazolidinone(DMI)-LiNO3 ionic liquid analogs at room temperature were investigated.Cyclic voltammetry indicated that the reduction peak at-1.83 V(vs Ag)was related to the reduction of Fe(Ⅱ)to Fe,while the reduction peak at-2.01 V(vs Ag)was related to the reduction of B(Ⅲ)to B.The electrochemical reduction reaction of Fe(Ⅱ)and B(Ⅲ)were irreversible processes controlled by diffusion,and the diffusion coefficients of Fe(Ⅱ)and B(Ⅲ)at 313 K were 3.03×10-6 and 6.74×10-7cm2/s,respectively.In addition,XRD analysis suggested that the product obtained by the electrodeposition in DMI-LiNO3-Nd(CF3SO3)3-FeC12-H3BO3 ionic liquid analogs for 2 h on the Al substrate contained NdFe3B3.SEM and EDS analysis showed that Nd,Fe,and B in the cathode product were uniformly distributed.XPS analysis revealed that the mass fractions of Nd,Fe,and B on the W substrate were 27.44％,27.90％,and 7.51％,respectively.
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