Interpreting the Passivation of HSLA Steel from Electrochemical Corrosion Investigations in Bicarbonate-Oil Aqueous Emulsions

This research proposes a schematic physical interpretation of passive films formed on HSLA steel during potentiodynamic polarization in bicarbonate-oil aqueous emulsions. The interpretation is based on the numerical calculation of charge-transfer release during the passivation process which showed an obvious disparity with bicarbonate and oil amounts. Other outcomes are attained with a primary objective to carrying out this research: the corrosion rates showed an increase with bicarbonate content and temperature, and oil acted as an anodic inhibitor. The EIS tests confirmed the corrosion inhibition and showed that the interfacial interactions that govern the corrosion reactions during the OCP conditions are adsorption-based