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Int. J. Mol. Sci. 2013, 14(6), 11915-11928; doi:10.3390/ijms140611915

Inhibition Effects of a Synthesized Novel 4-Aminoantipyrine Derivative on the Corrosion of Mild Steel in Hydrochloric Acid Solution together with Quantum Chemical Studies

1
Department of Chemical and Process Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, Bangi, Selangor 43600, Malaysia
2
Applied Chemistry Division, Applied Science Department, University of Technology, Baghdad 10066, Iraq
3
Applied Physics Division, Applied Science Department, University of Technology, Baghdad 10066, Iraq
*
Author to whom correspondence should be addressed.
Received: 27 February 2013 / Revised: 22 May 2013 / Accepted: 24 May 2013 / Published: 4 June 2013
(This article belongs to the Section Physical Chemistry, Theoretical and Computational Chemistry)
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Abstract

1,5-Dimethyl-4-((2-methylbenzylidene)amino)-2-phenyl-1H-pyrazol-3(2H)-one (DMPO) was synthesized to be evaluated as a corrosion inhibitor. The corrosion inhibitory effects of DMPO on mild steel in 1.0 M HCl were investigated using electrochemical impedance spectroscopy (EIS), potentiodynamic polarization, open circuit potential (OCP) and electrochemical frequency modulation (EFM). The results showed that DMPO inhibited mild steel corrosion in acid solution and indicated that the inhibition efficiency increased with increasing inhibitor concentration. Changes in the impedance parameters suggested an adsorption of DMPO onto the mild steel surface, leading to the formation of protective films. The novel synthesized corrosion inhibitor was characterized using UV-Vis, FT-IR and NMR spectral analyses. Electronic properties such as highest occupied molecular orbital energy, lowest unoccupied molecular orbital energy (EHOMO and ELUMO, respectively) and dipole moment (μ) were calculated and discussed. The results showed that the corrosion inhibition efficiency increased with an increase in the EHOMO values but with a decrease in the ELUMO value.
Keywords: corrosion inhibitor; electrochemical impedance spectroscopy; 2-methylbenzaldehyde corrosion inhibitor; electrochemical impedance spectroscopy; 2-methylbenzaldehyde
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Junaedi, S.; Al-Amiery, A.A.; Kadihum, A.; Kadhum, A.A.H.; Mohamad, A.B. Inhibition Effects of a Synthesized Novel 4-Aminoantipyrine Derivative on the Corrosion of Mild Steel in Hydrochloric Acid Solution together with Quantum Chemical Studies. Int. J. Mol. Sci. 2013, 14, 11915-11928.

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