Anti-corrosion performance of eco-friendly inhibitor (2-aminobenzyl) triphenylphosphonium bromide ionic liquid on mild steel in 0.5Â M sulfuric acid

The inhibition efficiency (IEinh %) of the (2-aminobenzyl)triphenylphosphonium bromide (ABTPPB) environmental friendly inhibitor on mild steel (MS) corrosion in 0.5 M H2SO4 solution at concentrations (10−5 to 10−2 M) and temperatures (298 to 328 K) have been achieved using potentiostatic polarization (PP), galvanostatic polarization (GP), electrochemical impedance spectroscopy (EIS), and surface characterized via the scanning electron microscopy (SEM) with energy dispersive x-ray (EDX) spectroscopy, and atomic force microscopy (AFM). The results confirmed that ABTPPB was a potent inhibitor for MS in corrosive medium with the IEinh (%) adequate to 99% in 10−2 M. EIS outcomes revealed the enlarged capacitive loop in the attendance of mitigator in comparison to that of the merely acid specifies a high degree of mitigation efficiency. The definite correlation between the experimental results and isotherm utility was achieved using Langmuir Adsorption (LA) isotherm, and the inhibitor is being chemisorbed predominantly on the MS surface. Both SEM-EDX and AFM analyses sustained the formation of protective layers of the ABTPPB molecules on the sample surface. Quantum chemical (QC) calculations were employed for computational calculations, and the acquired results were instigated to be reliable with the experimental findings.