THE INHIBITIVE EFFECT OF ETHANOLAMINE ON （乙醇胺的抑制的效果）.pdf

Association of Metallurgical Engineers of Serbia Scientific paper AMES UDC: 620.193/.196:669.711 ; 620.197.3 THE INHIBITIVE EFFECT OF ETHANOLAMINE ON CORROSION BEHAVIOR OF ALUMINIUM IN NACL SOLUTION SATURATED WITH CO2 ∗ Ivana Jevremović, Vesna Misković-Stanković University of Belgrade, Faculty of Technology and Metallurgy, Karnegijeva 4, 11000 Belgrade, Serbia Received 11.07.2012 Accepted 24.08.2012 Abstract In this study, the inhibitive effect of ethanolamine on corrosion behavior of aluminium was investigated in 3 wt. % NaCl solution, saturated with CO . All the experiments 2 were carried out at 20°C. Ethanolamine was added at different concentrations between 1 mM and 8 mM. In order to determine the corrosion inhibition efficiency of investigated inhibitor and the optimal concentration of inhibitor that provides the lowest corrosion of aluminium, the open circuit potential (OCP), electrochemical impedance spectroscopy (EIS), linear sweep voltametry (LSV) measurements, weight loss measurements as well as scanning electron microscopy technique (SEM) were performed. The electrochemical study and weight loss measurements indicated that the minimum corrosion rate and maximum inhibition efficiency was detected for concentration of 5 mM of ethanolamine, as well as the ethanolamine did not change the mechanism of aluminium dissolution. The adsorption of ethanolamine was found to obey Frumkin adsorption isotherm at conce