Chemical, electrochemical, theoretical (DFT & MD), thermodynamics and surface morphology studies of carbon steel during gas and oil production using three novel di-cationic amphiphilic as corrosion inhibitors in acidic medium

Abstract Three di-cationic amphiphiles were synthesized and characterized by FTIR, (1H & 13C) NMR spectroscopies. These compounds are tested as corrosion inhibitors for CS in 1 M HCl by weight loss (WL), EIS, potentiodynamic polarization (PP) techniques, and surface morphology (SEM & AFM). Surface tension results exhibited that these surfactants are a good surface attitude in their aqueous media. The gained results exhibited that the di-cationic surface-active agents are stellar deterioration inhibitors for CS in 1 M HCl. A discouragement efficacy augmented with increment of the inhibitor concentration. Adsorption of CSI, CSII & CSIII on CS in 1 M HCl was established to comply with Langmuir’s adsorption isotherm. SEM & AFM photos exhibit a good CS surface in presence of CSI, CSII & CSIII in opposite of the absence of them. The inhibition mechanism is suggested on the thermodynamic factors. The inhibitive impact of the explored surfactants against the corrosion of the CS surface was implied by DFT/6-31G(d,p) computations.