Physicochemical properties of 1,3-dimethyl-2-imidazolinone−ZnCl_(2)solvated ionic liquid and its application in zinc electrodeposition

1,3-二甲基-2-咪唑啉酮−ZnCl_(2)溶剂化离子液体的物化性质及在锌电沉积中的应用

Zinc chloride(ZnCl_(2))was dissolved in the 1,3-dimethyl-2-imidazolinone(DMI)solvent,and the metallic zinc coatings were obtained by electrodeposition in room-temperature ambient air.The conductivity(σ),viscosity(η),and density(ρ)of the DMI−ZnCl_(2)solvated ionic liquid at various temperatures(T)were measured and fitted.Furthermore,cyclic voltammetry was used to study the electrochemical behavior of Zn(II)in the DMI−ZnCl_(2)solvated ionic liquid,indicating that the reduction of Zn(II)on the tungsten electrode was a one-step two-electron transfer irreversible process.XRD and SEM−EDS analysis of the cathode product confirmed that the deposited coating was metallic zinc.Finally,the effects of deposition potential,temperature and duration on the morphology of zinc coatings were investigated.The results showed that a dense and uniform zinc coating was obtained by potentiostatic electrodeposition at−2 V(vs Pt)and 353 K for 1 h.

将ZnCl_(2)溶解于1,3-二甲基-2-咪唑啉酮(DMI)中,并在室温大气环境中电沉积得到金属锌涂层。测量不同温度下DMI−ZnCl_(2)溶剂化离子液体的电导率(σ)、黏度(η)和密度(ρ)并拟合出方程式。然后,利用循环伏安法研究Zn(II)在DMI−ZnCl_(2)溶剂化离子液体中的电化学还原行为,发现Zn(II)在钨电极上的还原为一步两电子的不可逆过程。阴极产物的XRD和SEM−EDS分析表明,沉积产物为金属锌。最后,考察沉积电位、温度和时间对锌镀层形貌的影响,结果表明,在−2 V(vs Pt)和353 K条件下恒电位电沉积1 h,可得到致密均匀的锌涂层。