Inhibition of mild steel corrosion in 1 M HCl solution by alkylimidazolium bromides was investigated using electrochemical and weight loss methods. The studied ionic liquids showed appreciable inhibition efficiencies. Polarization measurements proved that the studied ILs are mixed-type inhibitors with predominantly anodic inhibition. The inhibition efficiency increased with the ionic liquid concentration and with the length of the alkyl chain. The values obtained from the polarization curves and Nyquist plots are in good agreement. The highest inhibition efficiency reached for the 1-octyl-3-methylimidazolium bromide was 93%. The Gibbs energy of adsorption was calculated by means of the Flory-Huggins isotherm and El Awady Thermodynamic-kinetic model.Keywords: Alkylimidazolium bromides, corrosion inhibition, polarization curve, electrochemical impedance spectroscopy, hydrochloric acid
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