Imidazolium bearing ionic liquids (ILs), 3-hexadecyl-1-methyl-1H-imidazol-3-ium bromide [C 16 M 1 Im] [Br] and 3hexadecyl-1,2-dimethyl-1H-imidazol-3-ium bromide [C 16 M 2 Im] [Br] have been synthesized. These compounds were evaluated for corrosion resistance of mild steel in 1M HCl solution by gravimetric and electrochemical studies. The results were noticed that the inhibition efficiency, has enhanced due to a rise in the concentration of inhibitor. Further, it is observed that [C 16 M 2 Im] [Br] inhibition efficiency better than [C 16 M 1 Im] [Br] due to the increased alkyl substituents. Polarization study reveals that the used inhibitors behave as a mixed type, but predominantly exhibited the anodic inhibitive effect. The inhibitors adsorbed on the metal surface obeys Langmuir adsorption isotherm. Surface topography examined using an Atomic Force Microscope (AFM) and a Scanning Electron Microscope (SEM) with EDAX analyses. The formation of the Fe-inhibitor complex on mild steel surface has been confirmed by UV-Visible spectroscopy.

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The corrosion inhibition behavior of Tetra-n-butylammonium bromide (TBAB) on mild steel (MS) in 1N HCl was investigated through experimental and theoretical studies. Inhibition efficiency is found to have increased by a rise in the concentration of TBAB. Experimental (weight loss study, potentiodynamic polarization, electrochemical impedance spectroscopy) results suggested that TBAB exhibits better inhibition efficiency. Thermodynamic studies were discussed. TBAB on the mild steel surface obey Langmuir adsorption isotherm. SEM and AFM studies confirm the adsorption and protective ability of TBAB on mild steel in 1N HCl medium. Formation of a protective layer on mild steel was characterized by FT-IR, UV-Visible and XRD studies. Furthermore, quantum chemical parameters were calculated. The results demonstrate the adsorption capability of TBAB on mild steel in 1N HCl medium. Quantum chemical calculations are in good agreement with results obtained from experimental methods.

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