Abstract

B. Hammouti¹*, A. Zarrouk¹, S. S. Al-Deyab² and I. Warad²

The detailed study of corrosion behaviour of copper in 2M nitric acid solution in the presence and absence of 2-(4-(2-ethoxy-2-oxoethyl)-2-p-tolylquinoxalin-1(4H)-yl)acetate (Q1) was investigated using weight loss method at various temperatures from 303 to 343 K. The inhibitor showed 97% inhibition efficiency at its optimum concentration 10-3M at 303K and decreased at higher temperatures. The thermodynamic parameters such as, equilibrium constant, adsorption heat and adsorption entropy were obtained. The various parameters of activation determining the kinetic data such as energy, enthalpy and entropy at different concentrations of the inhibitor were evaluated and discussed. The adsorptive behaviour of Q1 followed Langmuir-type isotherm. The standard free energies of adsorption were negative at different temperatures tested, reûecting better inhibition performance.

Corrosion; Inhibition; Adsorption; quinoxaline; Activation

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