Abstract
A protective film was formed by immersing zinc electrode in ionic liquid (IL). The degradation of the formed film has been examined by open circuit potential (OCP), polarization and electrochemical impedance spectroscopy (EIS) measurements. The potential shifts rapidly to more negative values during the initial stage of monitoring, then increases slowly to more noble values with an extensive jagged potential fluctuation during the last stage of OCP monitoring. Corrosion rates of the pre-immersed sample are lower than that experienced by un-immersed zinc sample in IL. The degradation of the film formed on zinc surface can be described by a dissolution precipitation mechanism.