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In this paper, the effect of CO3 concentration on the corrosion behavior of pipeline steels was studied by using potentiodynamic polarization and electrochemical impedance methods in a high-pH simulated soil solution. The results showed that the corrosion of X80 pipeline steel in a Na2CO3 solution involved a self-passivation mechanism. As the CO3 concentration increased, the protective performance of the passivated film increased, whereas the corrosion rate decreased. When 1 mol/L NaHCO3 was added, the corrosion followed an active-passive mechanism and displayed two anodic peaks. Moreover, the influence of the CO3 concentration was different from that of NaHCO3, the NaHCO3 addition increased the corrosion current density, which consequently increased the corrosion rate.

Effect of CO32− Concentration on the Corrosion Behavior of X80 Pipeline Steel in Simulated Soil Solution