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journalArticle School of Chemistry and Chemical Engineering, Xi’an University of Architecture and Technology, Xi'an, China Li Zhang Qiu Effect of CO32− Concentration on the Corrosion Behavior of X80 Pipeline Steel in Simulated Soil Solution In this paper, the effect of CO32−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 CO32−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 CO32−concentration was different from that of NaHCO3, the NaHCO3 addition increased the corrosion current density, which consequently increased the corrosion rate. 4592-4601 5/2020 en http://www.electrochemsci.org/abstracts/vol15/150504592.pdf 2020-04-06 12:16:26 CrossRef International Journal of Electrochemical Science DOI 10.20964/2020.05.48 ISSN 14523981