铝在1-氢-3-甲基咪唑氯铝酸盐中的低温电沉积

合成了Lewis酸性1-氢-3-甲基咪唑氯铝酸型离子液体,并首次将其应用于铝的低温电沉积反应中。在不同条件下,通过循环伏安、计时电位和计时电流法对电沉积过程进行了研究,并对得到的铝沉积物进行了表征。结果表明,成核密度和晶粒生长速度对铝的沉积结构影响很大。铝的晶型取向主要取决于温度和电流密度。在5~15mA/cm2和313.2~343.2K的条件下可以获得平整、致密和附着力较好的铝沉积层。另外,电沉积的效率和铝的纯度也得到了明显改善。

Low-temperature Electrodeposition of Aluminum in 1-Hydrogen-3-methylimidazolium Chloroaluminate

Lewis acidic 1-hydrogen-3-methylimidazolium chloroaluminate ionic liquid was synthesized and applied to electrodeposite aluminum at low temperature. Electrodeposition process under different experimental conditions was investigated by cyclic voltammetry, chronopotentiometry and chronoamperometry. The morphology of deposits was characterized. The results show that nucleation density and grain growth rate exert big influence on structure of aluminum. Orientation of aluminum grain depends on temperature and current density. Smooth, dense and well adherent aluminum coatings are obtained on copper substrates at 5~15 mA/cm2 and 313.2~343.2 K. Moreover, deposition efficiency and aluminum purity are significantly improved.