Corrosion inhibiting performance of novel imidazolium‐based ionic liquids as an efficient and green corrosion constraint for carbon steel in neutral chloride solution

Abstract

Considering the ionic liquids (ILs) were classified as green inhibitors herein three ecofriendly imidazolium-based ILs were employed in corrosion inhibition, where weight loss evaluations along with electrochemical methods, including potentiodynamic polarization test, electrochemical impedance spectroscopy, and cyclic voltammetry measurements were exploited to elucidate corrosion prevention performance of the considered agents. The results derived from the polarization studies attested to the fact that these ILs could effectively act as mixed-type corrosion inhibitors. Moreover, the progress of surface reactions due to the corrosion process was studied through field emission scanning electron microscopy and atomic force microscopy. Also, UV/Vis spectroscopy corroborated chemical interaction among metal surfaces and ILs. Findings clarified that the chemisorption of the ILs onto carbon steel surface conforms to Langmuir adsorption isotherm. Finally, it was found that all proposed ILs could play an effective role in corrosion preventing, for which, the efficiencies in the range of 82%-92% were achieved by electrochemical impedance analyses for investigated ILs at 75 ppm.