常温型溶融塩からのアモルファスZn-Ni合金の電析

抄録

The electrochemical depositions of Zn-Ni alloy from ambient temperature molten salt electrolytes (ZnCl₂-NiCl₂-1-ethyl-3-methylimidazolium chloride (EMIC)-ethanol system) were investigated. The Ni content in the Zn-Ni alloy deposits could be controlled continuously from 18.8 to 93.0mol% by changing the bath composition and current density. In order to confirm the presence of amorphous structures on Zn-Ni alloy, X-ray diffraction (XRD) and differential scanning calorimetry (DSC) were used. The X-ray diffraction patterns of the alloy, in which Ni content was from 40.7 to 71.7mol%, showed a very broad peak indicating the presence of amorphous structure. The surface of the Zn-Ni deposits was very smooth and uniform. Moreover, the results of DSC measurements for the alloys showed exothermic peaks which are considered to be due to the amorphous-to-crystalline transformation and crystal growth. From these experimental results, it was confirmed that amorphous Zn-Ni alloys could be deposited electrochemically from ambient temperature molten salt electrolyte containing ethanol.