Investigation of Corrosion Inhibition of Mild Steel in 0.5 M HSO with Inhibitor Extracted from Rotten Grapefruits (): Adsorption, Thermodynamic, Electrochemical, and Quantum Chemical Studies.
Journal:
ACS physical chemistry Au
Published Date:
Dec 8, 2023
Abstract
Corrosion inhibition of mild steel (MS) was studied using isolate in 0.5 M HSO, which was isolated from rotten grapes () via biofilm formation. Biofilm over the MS surface was asserted by employing FT-IR and FE-SEM with EDXS, electrochemical impedance spectroscopy (EIS), AFM, and DFT-ESP techniques. The weight loss experiments and temperature studies supported the physical adsorption behavior of the corrosion inhibitors. The maximum inhibition efficiency (IE) value (90%) was observed at 293 K for 9 × 10 cfu/mL of isolate. The adsorption of isolate on the surface of MS confirms Langmuir's adsorption isotherm model, and the -Δ values indicate the spontaneous adsorption of inhibitor over the MS surface. Electrochemical studies, such as potentiodynamic polarization (PDP) and EIS were carried out to investigate the charge transfer (CT) reaction of the isolate. Tafel polarization curves reveal that the isolate acts as a mixed type of inhibitor. The Nyquist plots (EIS) indicate the increase in charge transfer resistance () and decrease of double-layer capacitance () values when increasing the concentration of isolate. The spectral studies, such as UV-vis and FT-IR, confirm the formation of a complex between MS and the isolate inhibitor. The formation of biofilm on the MS surface was confirmed by FE-SEM, EDXS, and XPS analysis. The proposed bioinhibitor shows great potential for the corrosion inhibition of mild steel in acid media.
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