1-辛基-2,3-二甲基咪唑氯盐离子液体对电解铜表面质量的影响

Effect of 1-octyl-2,3-dimethyl-imidazolium Chloride Ionic Liquid on Copper Electrorefining

以1-辛基-2,3-二甲基咪唑氯盐离子液体(简写式[OMMIm]Cl)作为添加剂进行铜的电解精炼,对所得阴极铜进行扫描电镜和粗糙度测试.结果表明,在铜电解液中添加5～20 mg/L的[OMMIm]Cl作为添加剂能使阴极铜晶粒细化、板面光滑致密;对含有上述添加剂的电解液进行循环伏安和塔菲尔测试,发现该添加剂对铜离子在阴极的放电有一定的促进作用;从工艺和电化学两方面对[OMMIm]Cl在62℃的铜电解液中的稳定性进行了研究,得知该离子液体在62℃的铜电解液中保温48 h也不影响其对阴极铜细化晶粒的作用效果.

1 - octyl - 2,3 - dimethyl - imidazolium chloride ionic liquid （ [ OMMIm ] C1） is employed as an addi- tive in copper electrorefining. The results of SEM and roughness tests of cathode copper demonstrate that small grain size, smooth and compact copper can be achieved when the additive concentration of 5 -20 mg/L is added in electrolyte. Cyclic Vohammetry and Tafel tests show that the additive has a little positive effect on ions dis- charge on copper cathode.