Effect of DMH on electrodeposition of silver in choline chloride-ethylene glycol bath
[Introduction]The effect of 5,5-dimethylhydantoin(DMH)as an additive on the electrodeposition of silver in choline chloride-ethylene glycol(ChCl-EG)deep eutectic solvent(DES)needs to be studied.[Method]The effect of DMH concentration on the reduction behavior and nucleation of Ag was studied by cyclic voltammetry(CV)and chrono-amperometry(CA).The phase structures,micromorphologies,and elemental compositions of the Ag coatings electro-deposited at different DMH concentrations were studied by X-ray diffraction(XRD),scanning electron microscopy(SEM),and energy-dispersive spectroscopy(EDS),and their corrosion resistance were examined through Tafel polarization measurement.[Result]With the addition of DMH and the increasing of DMH concentration,the reduction(peak)potential of silver electrodeposition was shifted towards the negative direction,and the reduction peak current density was slightly decreased.At the initial stage of electrodeposition,the nucleation of silver was close to the three-dimensional instantaneous nucleation model,but it gradually deviated from both the three-dimensional instantaneous nucleation model and the three-dimensional continuous nucleation model with the extending of time.The addition of DMH to the DES could refine the grain of Ag coating and improve its surface morphology.The Ag coating electro-deposited with 0.8 mol/L of DMH featured the most compact microstructure,the finest grains,and the best corrosion resistance.[Conclusion]DMH can be used as an additive for ChCl-EG DES to improve the properties of Ag coating.
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