Abstract
Investigation of inhibitive performance of Landophia heudelotii gum (LG) extract on acid corrosion of cold-rolled steel was conducted using gravimetric, electrochemical impedance spectroscopy (EIS), quantum chemical computation and molecular dynamics simulation techniques. Resultantly, LG extract significantly inhibited the corrosive action of the acid solutions (0.5 M H2SO4 and 0.5 M HCl solutions), and the effect was remarkable at elevated temperature of 40°C where the LG extract displayed highest inhibition efficiency (IE %) of 87.8 at 2.5 g/L and 81.6 at 2.0 g/L concentration in 0.5 M H2SO4 and 0.5 M HCl solutions, respectively. Adsorption and thermodynamic considerations suggest that the inhibiting molecules (quercetin, epicatechin, naringerin and kaempferol) were physically adsorbed on the metal surface. EIS results revealed that the charge transfer resistance (Rct) values were higher in 0.5 M H2SO4 solution than in 0.5 M HCl solution. Quantum chemical computation showed that epicatechin inhibiting molecule possessed the highest tendency to donate and accept electrons from the metal surface. Interestingly, epicatechin was confirmed to exhibit highest adsorption energy via molecular dynamic simulation.
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ACKNOWLEDGMENTS
The author is grateful to Africa Centre of Excellence in Future Energies and Electrochemical Systems (ACE-FUELS), Federal University of Technology Owerri (FUTO), Nigeria, for research support.
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Innocent O. Arukalam Experimental and Theoretical Elucidation on the Inhibitive Performance of Landophia heudelotii Gum Extract on Acid Corrosion of Cold-Rolled Steel. Prot Met Phys Chem Surf 57, 1085–1096 (2021). https://doi.org/10.1134/S207020512105004X
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DOI: https://doi.org/10.1134/S207020512105004X