Electrochemical and Theoretical Examination of Some Imine Compounds as Corrosion Inhibitors for Carbon Steel in Oil Wells Formation Water
Arafat Toghan, Ahmed Fawzy, Abbas I. Alakhras, Ahmed A. Farag
Abstract
The imine compounds (Z)-N-(2-(1-methyl-1H-pyrrol-2-yl)ethyl)-1-(thiophen-2-yl)ethan-1-imine (PSI) and (Z)-N-(2-(1-methyl-1H-pyrrol-2-yl)ethyl)-1-(pyridin-2-yl)ethan-1-imine (PPI) were effectively synthesized and described as corrosion inhibitors. The inhibition efficacy of PSI and PPI at carbon steel (CS) in formation water media was assessed using potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS) techniques, and quantum chemical calculations. PSI and PPI's inhibitory efficiency is related to the test's concentration. The maximum inhibitory efficiency was found in the presence of 1 × 10 –3 M PSI and PPI, with 83 and 90 %, respectively. The two compounds are good mixed-type corrosion inhibitors, according to potentiodynamic polarization experiments. Both inhibitors' adsorption on CS surfaces followed the Langmuir adsorption isotherm, with both physisorption and chemisorption. Additionally, DFT studies and molecular dynamic (MD) simulation were used to explore the impact of PSI and PPI molecular on inhibition performance in formation water.