1. Đenđi Vaštag, Serbia
2. Suzana Apostolov, Univerzitet u Novom Sadu, Prirodno-matematički fakultet, Serbia
3. Milan Vraneš, Serbia
4. Slobodan Gadzuric, Faculty of Sciences, University of Novi Sad, Serbia
In this paper, the possibility of using newly synthesized ionic liquid based on nicotinamide as a potential inhibitor of copper corrosion in an acidic sulfate medium was investigated. Inhibition efficiency of butyl-nicotinamide, [C4Nic]Br on copper corrosion in acidic (pH=3) 0.1 mol/dm3 sodium sulphate solution was analyzed using potentiostatic polarization measurements and electrochemical impedance spectroscopy (EIS). It was found that the investigated ionic liquid has inhibitory properties of the corrosion of copper in acidic media. The inhibitory effect of the test compound is manifested by rapid and spontaneous adsorption of [C4Nic]Br molecules on the copper surface following the Langmuir’s adsorption isotherm. As a result, the cathodic corrosion current decreases as well as the polarization resistance of the system increases in relation to the basic solution. Inhibition efficiency of the investigated compound largely depends on the applied concentration.