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A. Ali Gu¨ rten,Hu¨ lya Keles,Emel Bayol,Fatma Kandemirli 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.27 No.-
Inhibition effect of Schiff base namely 1-(2-hydroxybenzylidene)-3-(2,5-dioxoimidazolidin-4-yl) urea(ALS) was studied on carbon steel corrosion in 1.0 M HCl by using the electrochemical impedancespectroscopy (EIS), potentiodynamic polarization and linear polarization (LPR) and quantum chemicalstudy. The values of activation energy (Ea), equilibrium constant (Kads), adsorption free energy DG8ads,adsorption enthalpy DH8ads and adsorption entropy DS8ads were discussed. The adsorption of inhibitor onmetal followed Langmuir’s adsorption isotherm. The thermodynamic parameters of adsorption revealthat there is a strong interaction between inhibitor and carbon steel. The highest inhibition efficiencywas observed 5.0 10 4 M ALS concentration at 318 K. SEM and EDX observations confirmed theexistence of protective inhibitor film on metal surface. Quantum chemical study supports thecomparative inhibition effect of ALS.