A. A. Khadom,1,*A. S. Yaro,2 A. S. AlTaie,2A. A. H. Kadum1
1 Department of Chemical and Process Engineering, Faculty of Engineering and Built Environment, Kebangsaan Malaysian University, Bangi, 43600, Selangor, Malaysia
2Chemical Engineering Dept., College of Engineering, Baghdad University, Baghdad, Iraq
Received 10 May 2009; accepted 11 December 2009
Abstract
]]> The effect of phenylthiourea as a corrosion inhibitor for low carbon steel at different hydrochloric acid concentrations, different temperatures and fixed speed of electrode rotation, were addressed in this work. Polarization technique was used to evaluate the corrosion rates parameters. The corrosion rate of low carbon steel increases with temperature and follows Arrhenius equation in all acid concentrations in presence and absence of the inhibitor. Detailed thermodynamic parameters of activation (ΔHact and ΔSact) for the corrosion reaction were obtained using nonlinear estimation method, while adsorption parameters (ΔGads, ΔHads and ΔSads) were obtained using graphical method. Maximum inhibitor efficiency was (96.44%) obtained at 1 M HCl at 333 K and 1 g/L inhibitor concentration.Keywords: corrosion, low carbon steel, adsorption, activation parameters.
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*Corresponding author. aneesdr@gmail.com
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