Journal
JOURNAL OF MOLECULAR LIQUIDS
Volume 211, Issue -, Pages 105-118Publisher
ELSEVIER
DOI: 10.1016/j.molliq.2015.06.052
Keywords
Mild steel; Ionic liquids; Corrosion inhibition; DFT; Monte Carlo simulation
Funding
- North-West University
- National Research Foundation of South Africa (NRF) of South Africa
- Center of Research Excellence in Corrosion, King Fahd University of Petroleum and Minerals (KFUPM)
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The inhibition of mild steel corrosion in 1 M HCl solution by some itnidazolium-based ionic liquids (ILs), namely 1-ethyl-3-methylimidazolium tetrafluoroborate [EMIM](+)[BF4](-), 1-butyl-2,3-dimethylimidazolium tetrafluoroborate [BDMIM](+)[BF4](-) and 1-decyl-3-methylimidazolium tetrafluoroborate [C10MIM](+)[BF4](-) was investigated using experimental and theoretical techniques. All the studied ILs showed appreciable inhibition efficiencies. Polarization measurements showed that the studied compounds are mixed-type inhibitors and the results obeyed Langmuir adsorption isotherm. Spectroscopic studies confirmed chemical interactions between mild steel and the ILs. Scanning electron microscopy images revealed that the inhibitors formed protective film on mild steel surface. The results of quantum chemical calculations and Monte Carlo simulations agree with experimental observations. (C) 2015 Elsevier B.V. All rights reserved.
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