International Journal of Chemical Studies
Vol. 4, Issue 5 (2016)
Inhibition of corrosion of zinc in sulphuric acid by ethylamines
Author(s): SA Zele and RT Vashi
Abstract: The corrosion of zinc in sulphuric acid and its prevention by ethylamines has been studied in this investigation. In plain acid, corrosion increases with the concentration of acid and with the temperature. At constant acid concentration, the inhibition efficiency (I.E.) of ethylamines increases with inhibitor concentration. Similarly, at constant inhibitor concentration, the I.E. increases with the increase in acid concentration. Diethylamines shows excellent inhibition in all acid concentrations as well as at all inhibitor concentration at 310 K. At all acid concentrations and at 30, 40, 50 and 60 mM inhibitor concentration at 310 K, the I.E. of inhibitors decreases in the order: diethylamine > triethylamine > ethylamine. As temperature increases, percentage of inhibitor decreases. Plot of log (θ/1-θ) versus log C results in a straight line suggest that the inhibitors cover both the anodic and cathodic regions through general adsorption following Langmuir isotherm. Galvanostatic polarization curves show both anodic and cathodic polarization.
Pages: 31-38 | 1218 Views 22 Downloads
How to cite this article:
SA Zele, RT Vashi. Inhibition of corrosion of zinc in sulphuric acid by ethylamines. Int J Chem Stud 2016;4(5):31-38.