Inhibition of stainless and mild steel corrosion in 1 M HCl solution by 1-octyl-3-methylimidazolium bromide and 1-dodecyl-3-methylimidazolium bromide was investigated using electrochemical and weight loss methods. The qualitative surface analysis was carried out. The studied compounds showed appreciable inhibition efficiencies. Polarization measurements proved that they are mixed-type inhibitors with predominantly anodic action. The inhibition efficiency for mild steel is higher comparing with AISI 304 stainless steel. The Gibbs energy of adsorption was calculated by means of the Langmuir isotherm.Keywords: Imidazolium-based compounds; corrosion inhibition; polarization curve; electrochemical impedance spectroscopy; stainless steel
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