Corrosion Inhibition Propargyl Alcohol on Low Alloy Cr Steel in 0.5 M H2SO4 in the Absence and Presence of Potassium Iodide

Authors : Fatemeh BAGHAEİ RAVARİ, Mahdi HEYDARİ, Athareh DADGARİNEGHAD

Pages : 507-515

View : 17 | Download : 12

Publication Date : 2011-11-25

Article Type : Other Papers

Abstract :The corrosion and inhibition behaviors of low alloy Cr steel in sulfuric acid in the presence of propargyl alcohol insert ignore into journalissuearticles values(PA); and potassium iodide insert ignore into journalissuearticles values(KI); have been studied using Electrochemical Impedance Spectroscopy insert ignore into journalissuearticles values(EIS); and Tafel polarization method. It was found that the inhibition efficiency increased with PA concentration. The addition of potassium iodide to propargyl alcohol in solution increased the inhibition efficiency of propargyl alcohol. A synergistic effect was observed between KI and PA with optimum of concentration of 10 mMol propargyl alcohol + 0.01% potassium iodide. Adsorption of propargyl alcohol alone or in combination with potassium iodide on the metal surface obeyed the Langmuir adsorption isotherm and thermodynamic calculations revealed that that the adsorption of inhibitors were of physical nature. That suggest the presence of iodide ions in solution increases the surface coverage.     Key Words : Inhibitor, Propargyl alcohol, Potassium iodide,  Synergistic.  
Keywords : Inhibitor, Propargyl alcohol, Potassium iodide, Synergistic