Journal
JOURNAL OF MOLECULAR LIQUIDS
Volume 220, Issue -, Pages 71-81Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molliq.2016.04.042
Keywords
Mild steel (MS); Weight loss; Electrochemical measurements; Scanning electron microscopy (SEM); Atomic force microscopy (AFM)
Funding
- Ministry of Human Resource Development (MHRD), New Delhi, India
- Wroclaw Center for Networldng and Supercomputing [171]
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The corrosion inhibition effect of two nicotinonitriles namely, 2-amino-6-phenyl-4-(p-tolyl)nicotinonitriles (ATN) and 2-amino-4-(4-methoxyphenyl)-6-phenylnicotinonitrile (AMN), has been investigated for mild steel in 1 M HCl solution by using weight loss, electrochemical impedance spectroscopy and potentiodynamic polarization methods. The experimental results show that the inhibition efficiency increases (80-97%), with increase in the ATN and AMN concentration from 0.08-033 mM. The maximum inhibition efficiency 97.14% and 95.23% was obtained for AMN and ATN respectively at 0.33 mM. Both the inhibitors efficiently inhibit corrosion via adsorption on the metal surface and found to obey the Langmuir adsorption isotherm. Electrochemical impedance spectroscopy analysis reveals an increase in the charge transfer resistance due to the adsorption of inhibitors molecules on metal surface. Potentiodynarnic polarization data reveals that, both ATN and AMN predominantly act as cathodic inhibitors. The SEM and AFM, study confirms that the surface of inhibited metal surface is better than without inhibitor. The density function theory and Monte Carlo simulation have also been used to determine the relationship between molecular configuration and inhibition efficiencies. The experimental and theoretical results are in good agreement with each other. (C) 2016 Elsevier B.V. All rights reserved.
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