关键词: 电化学沉积, 共晶溶剂, 离子液体, 钴, 循环伏安

Abstract: The electrodeposition of cobalt from a solution containing cobalt chloride in either a urea-choline chloride based or an ethylene glycol (EG)-choline chloride based ionic liquid has been carried out onto copper and steel cathodes by constant current and constant potential methods at different temperatures. The influences of various experimental conditions on electrodeposition and morphology of the deposited layers have been investigated by scanning electron microscopy (SEM) and X-ray diffraction (XRD)technique. It has been shown that the smooth, shiny with good adherence and bright metallic coloured cobalt coatings were obtained from both urea and EG based ionic liquids at the applied deposition potentials up to -0.8 V and applied deposition current densities up to -6.0 A·m^-2 by the addition of 0.05 mol·L^-1 P₂O₅ at temperatures ranging from 30 to 90 ℃. The cathodic current efficiency for the deposition of cobalt reached 98%.

Key words: electrodeposition, reline, ethaline, cobalt, cyclic voltammetry