Inhibition effectiveness of two CO₂ corrosion inhibitors was evaluated at 200 °F and 80 psi CO₂ partial pressure under high turbulence multiphase fluid flow condition using the jet impingement technique. Electrochemical methods including linear polarization resistance (LPR) and electrochemical impedance spectroscopy (EIS) were employed to determine the general corrosion rate and obtain mechanistic information about flow induced pitting corrosion and film capacitance in the corrosion tests. The occurrence of pitting resulted in two time constants found in the EIS data compared to only one time constant found for the pit-free surface. The results demonstrate that high shear stress corrosion inhibitors not only offer general corrosion inhibition but also prevent carbon steels from pitting under aggressive multiphase flow conditions.