Electrochemical, thermodynamic, surface and theoretical investigation of 2-aminobenzene-1,3-dicarbonitriles as green corrosion inhibitor for aluminum in 0.5 M NaOH
By Chandrabhan Verma and P. Singh and I. Bahadur and E.E. Ebenso and M.A. Quraishi
Published in Journal of Molecular Liquids
2015
Abstract
The influence of 2-aminobenzene-1,3-dicarbonitriles derivatives (ABDNs) namely 5?-amino-2,4-dihydroxy-4?-methyl-1,1?:3?,1?-terphenyl-4?,6?-dicarbonitrile (ABDN-1), 5?-amino-2,2?,4-trihydroxy-1,1?:3?,1?-terphenyl-4?,6?-dicarbonitrile (ABDN-2) and 5?-amino-2,3?,4-trihydroxy-1,3-methoxy, 1?:3?,1?-terphenyl-4?,6?-dicarbonitrile (ABDN-3) on aluminum corrosion in 0.5 M NaOH was investigated using chemical and electrochemical methods. Potentiodynamic polarization study reveals that 2-aminobenzene-1,3-dicarbonitriles were mixed type inhibitors. Adsorption of 2-aminobenzene-1,3-dicarbonitriles on aluminum surface in 0.5 M NaOH follows the Langmuir adsorption isotherm. Adsorption of inhibitors on aluminum surface was studied using \SEM\ and \EDX\ spectroscopy examinations. Quantum chemical calculations support the weight loss and electrochemical observations.