Corrosion Inhibition Efficiency of 3-Hydroxy-2-Methylquinazoline-4-one on Mild Steel in 1 M H₂ SO₄ and 1 M HCl Acid at Different Temperatures

 

W.A. Siddiqi, V. M. Chaubey *

 

Environmental Science Laboratory, Department of Applied Sciences & Humanities, Faculty of Engineering & Technology,  Jamia Millia Islamia, New Delhi –110025. INDIA

 

Received 22 May 2007; accepted 29 August 2007

 

Abstract

The influence of  3-hydroxy-2-methylquinazoline -4-one on the corrosion inhibition of mild steel in 1 M HCl and 1 M  H₂SO₄ has been studied using weight loss, and galvanostatic polarization studies. Result obtained reveals that this organic compound is a very good inhibitor and its inhibition efficiency increases with increasing its concentration to attain 92% at 1000 ppm at 25 ºC. The potentiodynamic polarization study indicates that this compound acts as a mixed type corrosion inhibitor. The rate of corrosion of mild steel rapidly increases with temperature over the temperature range of 25 ºC to 55 ºC, both in absence and presence of the inhibitor. Thermodynamic parameter for adsorption process has been calculated using the Langmuir’s adsorption isotherm.

Keywords: corrosion, inhibition, 3-hydroxy-2-methylquinazoline -4-one, hydrochloric acid, sulfuric acid.

 

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* Corresponding author. E-mail address: vmch_2002@yahoo.com