화학공학소재연구정보센터
Langmuir, Vol.26, No.1, 215-219, 2010
Imidazole-Fe Interaction in an Aqueous Chloride Medium: Effect of Cathodic Reduction of the Native Oxide
The effect of the reduction of the native surface oxide of Fe on the binding of imidazole (as a corrosion inhibitor) with Fe in an aqueous brine solution has been addressed here. The surface interactions and corrosion inhibition efficiency were studied using X-ray photoelectron spectroscopy (XPS) and electrochemical impedance spectroscopy (EIS). It was shown that imidazole dissolved in brine bonds with the Unreduced iron oxide surface via pyrrole-type nitrogen. However, surface interactions with Fe occur via both pyridine-type and pyrrole-type nitrogen atoms when imidazole is added to brine containing a cathodically reduced iron surface. The packing density of imidazole is found to be higher ill the latter case with a corresponding increase in the corrosion inhibition efficiency.