alexa Quinoxaline derivatives as corrosion inhibitors for mild steel in hydrochloric acid medium: Electrochemical and quantum chemical studies


Journal of Steel Structures & Construction

Author(s): Olasunkanmi LO, Kabanda MM Ebenso EE

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The corrosion inhibition potential of four quinoxaline derivatives namely, 1-[3-(4-methylphenyl)-5- (quinoxalin-6-yl)-4,5-dihydropyrazol-1-yl]butan-1-one(Me-4-PQPB), 1-(3-(4-methoxyphenyl)-5-(qui- noxalin-6-yl)-4,5-dihydropyrazol-1-yl)butan-1-one(Mt-4-PQPB), 1-[3-(3-methoxyphenyl)-5-(quinox- alin-6-yl)-4,5-dihydropyrazol-1-yl]butan-1-one(Mt-3-PQPB) and 1-[3-(2H-1,3-benzodioxol-5-yl)-5- (quinoxalin-6-yl)-4,5-dihydropyrazol-1-yl]butan-1-one(Oxo-1,3-PQPB) was studied for mild steel cor- rosion in1 M HCl solution using electrochemical, spectroscopic techniques and quantum chemical cal- culations. The results of both potentiodynamic polarization and electrochemical impedance spectro- scopic studies revealed that the compounds are mixed-type inhibitors and the order of corrosion in- hibition efficiency at 100ppm is Me-4-PQPB > Mt-3-PQPB > Oxo-1,3-PQPB > Mt-4-PQPB. Fourier trans- form infra red (FTIR) and ultra violet–visible (UV–vis) spectroscopic analyses confirmed the presence of chemical interactions between the inhibitors and mild steel surface.The adsorption of the inhibitor molecules on mild steel surface was found to be both physisorption and chemisorption but pre- dominantly chemisorption.The experimental data obey Langmuir adsorption isotherm.Scanning elec- tron microscopy studies revealed the formation of protective films of the inhibitors on mild steel surface. Quantum chemical parameters obtained from density functional theory (DFT) calculations support ex- perimental results.

This article was published in Physica E: Low-dimensionalSystems and Nanostructures and referenced in Journal of Steel Structures & Construction

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