Abstract
Effect of salt (NaCl) concentration on the corrosion rate of carbon steel in CO2-saturated solutions was explored in a wide range from 0.001 wt% to 10 wt%. Electrochemical impedance spectroscopy (EIS) and linear polarization resistance (LPR) were utilized to determine the instantaneous corrosion rate of C1018 carbon steel under freely corroding condition. Both EIS and LPR results indicated that corrosion rate decreases with increasing salt concentration, and the highest corrosion rate was found at the lowest salt concentration (0.001 wt%). Potentiodynamic polarization and potentiostatic hold experiments were performed to study anodic and cathodic kinetics using microelectrode technique. Cathodic polarization results showed that the cathodic reaction is under diffusion or mixed control and the limiting current increases with decreasing salt concentration. Anodic polarization results suggested that chloride adsorption prevails at high salt concentration, while hydroxyl adsorption prevails at low salt concen...
Published Version
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