铝在室温熔盐中的电沉积

采用循环伏安法、计时电流法研究了铝在摩尔比为2∶1的AlCl3-EMIC离子液体中钨电极上的电化学还原机理和成核机理。研究表明:铝在钨极上存在欠电位沉积现象,铝的析出电位为-0.06 V,电化学反应为准可逆反应,形核过程为三维瞬时形核,半球形扩散控制长大。电沉积试验表明在电流密度为5~25 mA/cm2时镀层较致密、均匀,附着力好,纯度高。

The Electro-deposition of Aluminum from Molten Salts at Room Temperature

Cyclic voltammetry and chronoamperometry were used to study the electro-deposition mechanism and nucleation mechanism of aluminum electrodepositing on W electrode from 2∶1 molar ratio AlCl3–EMIC ionic liquids.It was found that there exists UPD deposition on W,the aluminum began to reduced at-0.06 V.The electrochemical reaction is quasi-reversible and the nucleation process is instantaneous three-dimensional nucleation with hemispherical diffusion controlled growth.The deposition experiment showed that the electrodeposits obtained on W between 5～25 mA/cm2 are dense,continuous,well adherent and high purity.