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) an...

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Bibliographic Details
Published in:Langmuir 2010-01, Vol.26 (1), p.215-219
Main Authors: Bhargava, G, Ramanarayanan, T.A, Bernasek, S. L
Format: Article
Language:English
Subjects:
Chemistry
Colloidal state and disperse state
Electrochemistry
Exact sciences and technology
General and physical chemistry
Interfaces: Adsorption, Reactions, Films, Forces
Surface physical chemistry
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Summary: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 in the latter case with a corresponding increase in the corrosion inhibition efficiency.
ISSN:0743-7463
1520-5827
DOI:10.1021/la9020355