Growing interest in transporting supercritical carbon dioxide (scCO 2) for enhanced oil recovery and carbon capture and storage has led to an increased interest in the corrosion behavior of pipeline steels at varying levels of water contamination. While there has already been substantial investigation of aqueous phase corrosion under scCO2 saturation, there has been little to no analysis of the kinetics of the charge transfer process in such environments. Additionally, our group has recently presented a probe for making measurements in the non-conductive scCO2 bulk phase when contaminated by water vapor. This was accomplished by coating the probe tip with an ion conductive membrane, though it was not determined whether the presence of this membrane in any way affected the observed corrosion behavior. The work presented here serves to both increase the knowledge of charge transfer kinetics in water-scCO2 corrosion and examine the influence of ion conductive membranes on the corrosion process.