Study of furfural derivatives as a possible green corrosion inhibitor for mild steel in CO2-saturated formation water.

The anticorrosive activity of furfural derivatives, by ex-situ and in-situ syntheses, on mild steel immersed in CO 2 -saturated formation water solution was evaluated using mass loss measurements, polarization curves, X-ray photoelectron spectroscopy, quantum chemical calculation, and electrochemical impedance. Furfural thiosemicarbazone presented inhibition efficiency reaching 90.2% for 72 h in immersion. The same molecule, synthesized in-situ by the mixture of the precursors in the corrosive medium, also produced good efficiency, 82.2% for 24 h of immersion, but it decreased over the time due to incomplete conversion of the precursors in furfural thiosemicarbazone. [Display omitted] • In-situ synthesis of furfural thiosemicarbazone occurred in the corrosive medium. • Furfural thiosemicarbazone presented great inhibition efficiency for mild steel. • The presence of S atom plays a crucial role in the interaction of the inhibitor with the metallic surface. [ABSTRACT FROM AUTHOR]