Corrosion inhibition performance of imidazolidine derivatives for J55 pipeline steel in acidic oilfield formation water: Electrochemical, surface and theoretical studies

Abstract

Present paper deals with the performance of imidazoline derivatives (ATs) as corrosion inhibitor for J55 steel in oil field formation water saturated with CO2. The inhibition effectiveness of AT-1 was found to 90% at 400 mg/L. Inhibitors addition decreases cathodic as well anodic current densities, and significantly strengthens impedance parameters. Contact angle and SEM/AFM/SECM measurements predicts the hydrophobicity and surface morphology of steel, respectively. Density functional theory (DFT) and molecular dynamic simulation (MD) calculations were performed to investigate the adsorption mechanism of ATs. Radial distribution function (RDF) and the mean-square displacement (MSD) were used to study inhibitor/metal interactions and migration rate of corrosive species, respectively. © 2018 Taiwan Institute of Chemical Engineers