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Molecules 2015, 20(1), 366-383; doi:10.3390/molecules20010366

New Coumarin Derivative as an Eco-Friendly Inhibitor of Corrosion of Mild Steel in Acid Medium

1
Department of Chemical and Process Engineering, University Kebangsaan Malaysia (UKM), Bangi, Selangor 43000, Malaysia
2
Environmental Research Center, University of Technology (UOT), Baghdad 10001, Iraq
3
Fuel cell Institute, Universiti Kebangsaan Malaysia (UKM), Bangi, Selangor 43000, Malaysia
*
Author to whom correspondence should be addressed.
Academic Editor: Derek J. McPhee
Received: 4 September 2014 / Accepted: 8 December 2014 / Published: 29 December 2014
(This article belongs to the Section Molecular Diversity)
View Full-Text   |   Download PDF [2230 KB, uploaded 29 December 2014]   |  

Abstract

The anticorrosion ability of a synthesized coumarin, namely 2-(coumarin-4-yloxy)acetohydrazide (EFCI), for mild steel (MS) in 1 M hydrochloric acid solution has been studied using a weight loss method. The effect of temperature on the corrosion rate was investigated, and some thermodynamic parameters were calculated. The results indicated that inhibition efficiencies were enhanced with an increase in concentration of inhibitor and decreased with a rise in temperature. The IE value reaches 94.7% at the highest used concentration of the new eco-friendly inhibitor. The adsorption of inhibitor on MS surface was found to obey a Langmuir adsorption isotherm. Scanning electron microscopy (SEM) was performed on inhibited and uninhibited mild steel samples to characterize the surface. The Density Function theory (DFT) was employed for quantum-chemical calculations such as EHOMO (highest occupied molecular orbital energy), ELUMO (lowest unoccupied molecular orbital energy) and μ (dipole moment), and the obtained results were found to be consistent with the experimental findings. The synthesized inhibitor was characterized by Fourier transform infrared (FTIR) and nuclear magnetic resonance (NMR) spectroscopic studies. View Full-Text
Keywords: 4-hydroxycoumarin; 13C-NMR; corrosion inhibitor; weight loss 4-hydroxycoumarin; 13C-NMR; corrosion inhibitor; weight loss
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Al-Amiery, A.A.; Al-Majedy, Y.K.; Kadhum, A.A.H.; Mohamad, A.B. New Coumarin Derivative as an Eco-Friendly Inhibitor of Corrosion of Mild Steel in Acid Medium. Molecules 2015, 20, 366-383.

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