Journal of Advanced Research in Science and Technology
Volume 5, Numéro 2, Pages 834-844

Corrosion Inhibition Of Carbon Steel (xc 38) In Hydrochloric Acid By Potassium Iodide

Authors : Attar Tarik .

Abstract

The corrosion inhibition of XC38 carbon steel in 1 M hydrochloric acid solutions by iodide potassium was studied at temperature range (293-333K) by gravimetric measurements. The inhibition efficiency decreases with increasing temperature. The adsorption of iodid potassium takes place according to Langmuir's adsorption isotherm. Kinetic parameters (activation energy Ea, enthalpy of activation ΔHa and entropy of activation ΔSa) as well as thermodynamic parameters (enthalpy of adsorption ΔHads, entropy of adsorption ΔSads and Gibbs free energy ΔGads were calculated and discussed; on the bases of these parameters both physisorption and chemisorption were suggested for this inhibitor. The adsorption of the inhibitor on the carbon steel surface is in agreement with Langmuir adsorption isotherm.

Keywords

Adsorption isotherm, Corrosion inhibition, Carbon steel, Potassium iodide, Thermodynamic parameters.

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