Inhibition effectiveness of two CO2 corrosion inhibitors was evaluated at 93 °C (200 °F) and 0.55
MPa (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.