Effect of Ca~(2+) and Mg~(2+) on CO_2 Corrosion Behavior of Tube Steel

Abstract

Effects of Ca 2+ and Mg 2+ on the CO 2 corrosion behaviors of tube steel were studied in simulated oil-field environment. The influence of Ca 2+ and Mg 2+ on the corrosion rate and morphologies of corrosion product layer was determined by scanning electron microscope and measuring mass loss. Potentiodynamic polarization and impedance spectroscopy were used to investigate the change of electrochemical characteristic parameters of corrosion product layer and corrosion dynamic process. The results show that with Ca 2+ and Mg 2+ in electrolyte, the morphologies and microstructures of corrosion product layer changed obviously, thus affecting the corrosion process.