Controlling of mild-steel corrosion in acidic solution using environmentally friendly ionic liquid inhibitors: Effect of alkyl chain
By Azeez, Fadhel A.; Al-Rashed, Osama A.; Nazeer, Ahmed Abdel
Published in Journal of Molecular Liquids
2018
Abstract
In this study three environmentally friendly ionic liquids (ILs) namely: 1-Methyl-3-propylimidazolium iodide (MPIMI), 1-butyl-3-methylimidazolium iodide (BMIMI) and 1-hexyl-3-methylimidazolium iodide (HMIMI) were examined as inhibitors for suppressing mild-steel corrosion in 1 M HCl solution. PDP, EFM and EIS techniques were used to study the inhibition action on the metal surface. PDP study revealed that these ILs acted as mixed-type inhibitors due to their adsorption on the steel surface following Langmuir adsorption isotherm. The negative values obtained for Gibbs free energy supported the spontaneous physical adsorption of these inhibitors. Pronounced elevation in the inhibition efficiency was achieved with increasing the concentration of the ILs with maximum inhibitions of 93.1%, 87.8% and 80.4% using 5
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