Corrosion inhibition of carbon steel in hydrochloric acid 0.5 M by hexa methylene diamine tetramethyl-phosphonic acid |
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| Authors: | R Laamari J Benzakour F Berrekhis A Abouelfida A Derja D Villemin |
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| Institution: | 1. Laboratoire d’Electrochimie et de Chimie Analytique, Université Cadi Ayyad, Faculté des Sciences Semlalia, BP 2390, Marrakech, Morocco;2. Laboratoire de Chimie Physique, Ecole Normale Supérieure, BP 2400 Marrakech, Morocco;3. École Nationale Supérieure d’Ingénieurs de Caen UMR 6507 CNRS, Bd Maréchal Juin 14050 Caen Cedex, France |
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| Abstract: | The efficiency of hexa methylene diamine tetra methyl-phosphonic acid (HMDTMP), as corrosion inhibitor for carbon steel in 0.5 M HCl, has been determined by gravimetric and electrochemical measurements. Polarization curves indicate that the compound is a mixed inhibitor, affecting both cathodic and anodic corrosion currents. Adsorption of HMDTMP derivatives on the carbon steel surface is in agreement with the Langmuir adsorption isotherm model, and the calculated Gibbs free energy value confirms the chemical nature of the adsorption. EIS results show that the charge in the impedance parameters (Rt and Cdl) with concentrations of HMDTMP is indicative. The adsorption of this molecule leads to the formation of a protective layer on carbon steel surface. The electrochemical results have also been supplemented by surface morphological studies. |
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| Keywords: | Corrosion Inhibition Impedance Adsorption Phosphonic acid |
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