The Corrosion Inhibition of Mild Steel By 2-Ethyl-3-Methylquinazolin-4(3h)-Ones in Sulphuric Acid Medium

DOI : http://dx.doi.org/10.13005/msri/060211

Download this article as: 

The inhibition of the corrosion of mild steel in 0.5 M H2SO4 by 2-ethyl-3-methylquinazolin-4(3H)-ones inhibitor (EMQ) has been investigated at various concentrations of the inhibitor as well as at different temperature using Weight loss and Electrochemical measurement techniques. The effect of the temperature on the corrosion behaviour with addition of different concentrations of EMQ compound was studied in the temperature range of 298K - 318K. Polarization curve reveals that EMQ compound is temperature independent but inhibition efficiency increases with increase in inhibitor concentration. Changes occurred in impedance parameters (Change transfer resistance, Rt and Double-layer capacitance, Cdl) were indicative of adsorption of EMQ on the metal surface leading to the formation of a protective film. Adsorption of EMQ on the mild steel surface is found to obey the Langmuir adsorption isotherm. The mild steel samples were also analyzed by Scanning Electron Microscopy (SEM). The protection efficiency increases with increasing inhibitor concentration in the range of 10-7 to 10-3 M but slightly decreases with increase in temperature.

Mild Steel; Corrosion inhibitors; Acid medium; Electrochemical Impedance Spectroscopy