Newly synthesized quaternary ammonium bis-cationic surfactant utilized for mitigation of carbon steel acidic corrosion; theoretical and experimental investigations

Abstract

New quaternary ammonium bis-cationic surfactant namly; 4,4′-(((1Z,5Z)-pentane-1,5-diylidene)bis(azaneylylidene))bis(1-dodecyl-1,5-dimethyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazol-1-ium bromide (QABCS) was synthesized and characterized via various spectral techniques. Surface tension measurements were performed for the investigation of surface-active parameters. QABCS's effectiveness as a corrosion inhibitor for carbon steel (CS) in 1.0 M HCl was evaluated using a variety of techniques. Inhibition potency progresses via rising QABCS dose while decreases with the temperature increasing. QABCS boosts the impedance of CS corrosion via 94.67% at 1 × 10−3 M. In addition, QABCS adsorption is consistent with Langmuir dsorption isotherm model. QABCS regards a mixed-type inhibitor. The explanation of density-functional theory (DFT) and Monte Carlo (MC) findings shows that the QABCS compound has a high adsorption potential on CS surface due to active centers in the QABCS' molecular structure. According to the scanning electron microscope (SEM) and atomic force microscope (AFM) findings, QABCS creates a shielding layer over carbon steel substrate. Theoretical discussions, as well as SEM and AFM findings, are compatible with laboratory corrosion assessment studies.