Corrosion behavior of X65 carbon steel in simulated oilfield produced water

Corrosion behavior of X65 steel in simulated oil field water was studied by weight loss, polarization curve, electrochemical impedance spectroscopy, scanning electron microscope, and X-ray diffraction methods. Effects of temperature, acetic acid concentration, and CO₂ partial pressure on the corrosion behavior were discussed. Results showed that the corrosion rate increased with the increasing of temperature, acetic acid concentration, and CO₂ partial pressure. High temperature favored the formation of FeCO₃; the addition of acetic acid could speed hydrogen depolarization, but the more acetic acid could remove FeCO₃ layer, CO₂ mainly influenced the cathodic reaction, appearing limiting diffusive current density. Acetic acid and CO₂ had a synergistic effect on the corrosion process of X65 carbon steel in simulated oilfield produced water.