Insights of Corrosion Inhibitor Based in Pyridinium Ionic Liquids

Steel surfaces treated with synthesized ionic liquid (ILs) namedly 4-methyl-1-(3-phenoxypropyl) pyridinium bromide ( Pyr 1 ) , 4-(dimethylamino)-1-(2-phenoxyethyl) pyridinium bromide ( Pyr 2 ) and4-(dimethylamino)-1-(3-phenoxypropyl) pyridinium bromide ( Pyr 3 ) were investigated in HCl acid media (1 M) using several techniques. Surfaces were analyzed by SEM and FESEM microscopy and by XPS spectroscopy, while the inhibition process was studied by electrochemical impedance (EIS) measurements. The results obtained by EIS demonstrated a higher charge transfer resistance that led to a high inhibition performance. According to Langmuir isotherm model and the activation parameters, these ILs can be adsorbed onto the mild steel surface through physical and chemical bonds. This study was supported by DFT and Monte Carlo calculations approach which confirms the adsorption behavior of the studied ILs.