Adsorption behavior of 8,9-bis(4 (dimethyl amino)phenyl)benzo[4,5]imidazo[1,2-a]pyridine-6,7-dicarbonitrile on mild steel surface in 1 M {HCl}
By Verma, Chandrabhan; Quraishi, M. A.
Published in Journal of the Association of Arab Universities for Basic and Applied Sciences
2017
Abstract
Abstract The effect of 8,9-bis(4 (dimethylamino)phenyl)benzo[4,5]imidazo[1,2-a]pyridine-6,7-dicarbonitrile (INH) on mild steel corrosion in 1 M {HCl} was studied by electrochemical, surface and quantum chemical calculation methods. Results showed that percentage of inhibition efficiency increases on increasing {INH} concentration. The maximum inhibition efficiency of 96.32% was obtained at 25 mg L?1 concentration. Tafel polarization measurements show that the presence of {INH} in acid solution affects both cathodic and anodic reactions but acts as predominantly cathodic type inhibitor. The Scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and atomic force microscopy (AFM) studies suggest the formation of adherent layer of {INH} on mild steel surface. The results of theoretical calculations were found to be consistent with the surface and electrochemical results.