Synergistic Inhibition Effect of 10-(3-Quinuclidinyl-Methyl) Phenothiazine and Potassium Iodide on Carbon Steel Corrosion in Sulfuric SolutionJournal: International Journal of Science and Research (IJSR) (Vol.3, No. 5)
Publication Date: 2014-05-15
Authors : Ahmed A. Farag; Khalid Zakaria;
Page : 107-113
Keywords : Corrosion inhibitor; Synergism; Iodide ion; Adsorption; EIS;
The inhibition effect of 10-(3-quinuclidinylmethyl) phenothiazine (QMPT), Potassium iodide and their synergistic effect on the corrosion of carbon steel in 0.5 M H2SO4 solution was studied by different electrochemical techniques. The inhibition efficiency increases with QMPT and KI concentration and increase further in presence of QMPT/KI mixtures. The adsorption of QMPT and KI on the metal surface in 0.5 M H2SO4 solution obeys the Langmuir adsorption isotherm. The probable inhibitory mechanism is proposed from the viewpoint of adsorption theory. The synergism parameter suggests that there is a cooperative mechanism between the iodide anion and QMPT cations.
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