Experimental and theoretical study of new Schiffbases based on imidazo(1,2-a)pyridine as corrosion inhibitor of mild steel in 1M HCl
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Date
Şubat 2021Author
ELAATIAOUI, AbdelmalikKOUDAD, Mohammed
CHELFI, Tarik
Erkan Sultan
AZZOUZI, Mohamed
AOUNITI, Abdelouahad
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El Aatiaoui, A., Koudad, M., Chelfi, T., Erkan, S., Azzouzi, M., Aouniti, A., ... & Oussaid, A. (2021). Experimental and theoretical study of new Schiff bases based on imidazo (1, 2-a) pyridine as corrosion inhibitor of mild steel in 1M HCl. Journal of Molecular Structure, 1226, 129372.Abstract
In this work, we report a study on the synthesis and characterization, using several spectroscopic techniques such as IR, 13C NMR, 1H NMR and mass spectroscopy, of a new series of Schiff bases based on imidazo(1,2a)pyridine (IMP) scaffold, and the evaluation of their ability to inhibit the corrosion of mild steel in 1M HCl by mass loss techniques, Potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and quantum chemistry calculation based on density functional theory (DFT).
The obtained results show that these inhibitors, namely (E)-N-(2-phenylimidazo(1,2-a)pyridin-3-yl)-1-(1H-pyrrol-2-yl)methanimine (IMP1), (E)-N-(2-phenylimidazo(1,2-a)pyridin-3-yl)-1-(thiophen-2-yl)methanimine (IMP2) and (E)-1-(5-nitrothiophen-2-yl)-N-(2-phenylimidazo(1,2-a)pyridin-3-yl)methanimine (IMP3), act only by reducing the cathode area without changing the mechanism of the cathodic reaction, and that the effectiveness of the inhibition increases with increasing concentration of the inhibitors. The adsorption of the studied compounds on the surface of mild steel follows the Langmuir isotherm model. And finally, we highlighted the existence of a correlation between the molecular structure of the tested inhibitors and their anticorrosion activity.
Source
Journal of Molecular StructureVolume
1226URI
https://www.sciencedirect.com/science/article/pii/S0022286020316902https://hdl.handle.net/20.500.12418/13150