Corrosion Inhibition of X-65 Carbon Steel in Oil Wells Produced Water under CO2 Environment

Abstract

Corrosion behavior of X-65 type carbon steel exposed to CO2 saturated oil well produced water was studied in the absence and presence of new synthesized; ethoxy- (5-methyl-benzotriazol-1-yl) (EMB) at 50 oC by both potentiodynamic polarization and electrochemical impedance (EIS) techniques. Results indicated that the inhibitor retards both cathodic and anodic reactions and acts as mixed type inhibitor. SEM technique confirmed formation of a good protective film on metal surface which imparts the high inhibition efficiency. The results were discussed in the light of quantum chemical calculations to provide theoretical interpretation of the inhibitor performance.