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Portugaliae Electrochimica Acta
versão impressa ISSN 0872-1904
Port. Electrochim. Acta v.26 n.2 Coimbra 2008
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 Langmuirs 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