Department of Chemical Engineering.
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Item CORROSION INHIBITION OF A36 MILD STEEL IN ACIDIC MEDIUM USING Citrus paradisi Rind Inhibitor(Rasayan J. Chem., 15(3), 2022-07) Ayoola, Ayodeji Ayodele; Olulesho, S; Durodola, Bamidee; Agboola, o.; Oladokun, O.; Ayeni, A.; Fayomi, O. S. I.; Babalola, R.The effectiveness of grapefruit (citrus paradisi rind) peel powder as a green corrosion inhibitor on A36 mild steel in 0.5M H2SO4 was examined. Gravimetric tests, SEM-EDS, and adsorption isotherm techniques were used to determine the corrosion inhibition features of the inhibitor on the surface of A36 mild steel. The tests were carried out with variation in concentration of inhibitor (0–0.4 %w/v), corrosion temperature (301K and 318K), and corrosion time (3 12 hours). The findings demonstrated that citrus paradisi rind powder effectively inhibited the corrosion of A36 mild steel on the surface with maximum corrosion inhibition efficiency of 85% at 0.4 w/v% inhibitor concentration at 310K corrosion temperature. The SEM-EDS analysis established the presence of sulphur, nitrogen, and oxygen (organic constituents), as well as the formation of a protective coating on the mild steel surface. Langmuir adsorption isotherm was found suitable for the prediction of the adsorption of citrus paradisi rind inhibitor on the mild steel surface. The thermodynamic considerations (∆𝐻 and (∆𝑆) indicated that the inhibition of A36 mild steel corrosion (using citrus paradisi rind inhibitor) was an exothermic process and the inhibitor molecules were physically adsorbed on the metal surface.Item Corrosion Inhibition on Mild Steel using Zinc Phosphating Modified with Magnesium and Calcium Additives(Portugaliae Electrochimica Acta 44, 2026) Ayoola, Ayodeji Ayodele; Durodola, M. E.; Babalola, R.; Fayomi, O. S. I.; Okoji, A.; Agbeyegbe, G. A.; Obigwe, C.MS is a very versatile and useful alloy in metal industry, since it is available and affordable, but it is prone to corrosion. This study investigated MS corrosion inhibition by modifying Zn₃(PO₄)2 bath with MgO and, then, with combined MgO and CaO additives. Different phosphating times (40, 60 and 80 min) and T (65 and 80 °C) were considered. Ct from 0 to 1.8 g/L MgO and combined MgO/CaO additives were added to Zn₃(PO₄)2 bath. SEM analysis of the coated samples was carried out. The specimens were also immersed in 3.5 wt% NaCl, for WL testing. Obtained results showed that the highest IE(%) of 56% was obtained for the MS sample at a phosphating T of 65 °C and Ct of 1.8 g/L MgO additive. For combined MgO and CaO additive, an IE(%) of 32% was obtained, at 65 °C, with a Ct of 0.9 g/L. MgO and CaO adsorption process (separately and combined) onto MS followed Freundlich’s adsorption model. ΔG indicated a physical adsorption process, and ΔH indicated an exothermic adsorption process, while ΔS during coating revealed a decrease in the process randomness degree.