Corrosion Inhibition Characteristics of Reinforced Steel in H₂SO₄ by Benzoyl Thiourea
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Corrosion, Reinforced Steel, Acidic Medium, Weight Loss, Adsorption Isotherm, Inhibition Efficiency, Benzoyl Thiourea Inhibitor, DFT Calculation
Abstract
In The adsorption and corrosion inhibition performance of 3,3-diethyl(4-chloro) benzoylthiourea, ClDEBT, at reinforced steel in the H₂SO₄ interface, was examined using the gravimetric method at 303.15 K. The inhibition effectiveness of ClDEBT was improved by increasing the concentration. The adsorption data of ClDEBT on the reinforced steel surface were fitted to Langmuir, Temkin, and thermodynamic–kinetic adsorption isotherms, and some thermodynamic functions, such as α, y, f, ΔGads and Kads were obtained. Activation energies of 35.69 and 55.99 kJ mol−1 for the corrosion processes of reinforced steel were observed in the presence and absence of benzoylthiourea inhibitors, respectively. The adsorption of thiourea inhibitor on the surface of reinforced steel was found to be spontaneous and exothermic. Quantum parameters as the highest & lowest occupied molecular orbital energy (EHOMO) & (ELUMO), energy gap (ΔE), were determined and correlated to the experimental data.
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