Abstract
N,N'-Bis(3-oxo-2-phenyl-2,3-dihydro-1H-pyrazol-4-yl)-oxalamide (NNB) was synthesized via a non-solvent reaction mechanism. NNB was characterized using Fourier transform infrared (FTIR) and proton nuclear magnetic resonance (1HNMR) spectroscopy. Inhibition of corrosion in carbon steel was studied in the presence and absence of NNB in 1 M HCl solution using standard gravimetric technique and potentiodynamic polarization at 303–323 K. This was further subjected to quantum chemical parameters using density functional theory (DFT). FTIR and 1HNMR results confirmed the synthesis of NNB. The inhibition of carbon steel corrosion by NNB obeyed Langmuir isotherm at an efficiency of 78.10%. Lowest unoccupied molecular orbital (LUMO) as well as the highest occupied molecular orbital (HOMO) revealed insight into the interaction between NNB and the corroded carbon steel. The free energy of adsorption (\(\Delta G_{{{\text{ads}}}}^{^\circ }\)) increased as the temperature increased while the enthalpy (\(\Delta H_{{{\text{ads}}}}^{^\circ }\) ) revealed the inhibition process to be exothermic.
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ACKNOWLEDGMENTS
Authors are grateful to the Department of Chemical Sciences, Redeemer’s University for the provision of chemicals and research space.
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Authors also appreciates the support from Institut für Anorganische und Analytische Chemie, Friedrich-Schiller-Universität Jena, Germany.
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Adeyemi, O.G., Adewuyi, A., Olumolade, O. et al. Green Synthesis of N,N'-Bis(3-oxo-2-phenyl-2,3-dihydro-1H-pyrazol-4-yl)-oxalamide: A Corrosion Inhibitor of Carbon Steel in Acidic Medium. Prot Met Phys Chem Surf 59, 254–264 (2023). https://doi.org/10.1134/S2070205122060028
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DOI: https://doi.org/10.1134/S2070205122060028