The corrosion inhibition of Tetracycline and Streptomycin on the carbon-steel, Fe (110), in seawater was evaluated using weight loss, Tafel polarization, electrochemical impedance spectroscopy and SEM morphometric methods. The surface adsorption of inhibitors follows the Langmuir adsorption isotherm and acts as spontaneous mixedtype corrosion inhibitors on the carbon-steel surface. The related thermodynamic parameters (Ea, Kads, ΔGads, ΔH≠ and ΔS≠) were evaluated and the interaction energy for Streptomycin was more than the Tetracycline. The SEMmorphometric showed a good protection effect of inhibitors on carbon-steel in the presence of seawater and thiswasmore efficient for Streptomycin. Toemphasize the further insight into the efficiency of inhibitors, the Quantum chemical analysis and molecular dynamics simulations were used to find themost stable configuration and adsorption energies for inhibitors on the carbon-steel surface. The theoretical quantumchemical data such as EHOMO, η, χ, molecular surface area, MV, μ, α and ΔN were in agreement with inhibition efficiencies (IE %) that were obtained experimentally. Also, the molecular dynamics simulation showed the most stable configuration and adsorption energies of Streptomycin and Tetracycline on the carbon-steel and this follows the order of Streptomycin N Tetracycline, as verified by the experimental data.
کلید واژگان :Corrosion inhibitor Molecular dynamic Seawater Streptomycin Tafel polarization Tetracycline
ارزش ریالی : 600000 ریال
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