Corrosion inhibition effect of Allium sativum extracts on mild steel in HCl and H2SO4

Loto, C. A. and Loto, R. T. and Oshogbunu, Ohwofasa J. (2016) Corrosion inhibition effect of Allium sativum extracts on mild steel in HCl and H2SO4. Journal of Chemical and Pharmaceutical Research, 8 (2). pp. 216-230. ISSN 0975-7384

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Abstract

The effect of Allium sativum(garlic) extract as a ‘green’ inhibitor on mild steel corrosion in 0.5M HCl and 0.5M H2SO4 was studied at ambient temperature. Weight loss/corrosion rate and potentiostatic polarization measurement techniques were used for the experimental work. Potentiostatic polarization measurement was performed using a potentiostat (Autolab PGSTAT 30 ECO CHIMIE) interfaced with a computer for data acquisition and analysis. Results obtained showed effective corrosion-inhibition of the extract on the mild steel test-specimens in the different concentrations of HCl and H2SO4 used. There was increasing inhibition performance with increasing concentration of inhibitor. The best inhibition performance was achieved with the 100% (as extracted) garlic concentration. In 0.5M HCl, 100% garlic gave the optimal performance with weight loss at 8 days of the experiment of -0.15g, polarization resistance value of 2.78E+03Ω, corrosion rate, CR, of 9.47E – 02 mm/yr and current density (Icorr) value of9.46E-02 A/cm2. A similar result was observed in 0.5M H2SO4 where 100% garlic gave the best results of - 0.145g weight loss, polarization resistance value of2.79E+03Ω;corrosion rate, CR, value of9.46E-02 mm/yr and current density of9.20E-06 mm/yr. Results of ba and bc indicate a mixed type inhibitor

Item Type:	Article
Uncontrolled Keywords:	Corrosion, Allium Sativum, mild steel, inhibition, sulphuric acid, hydrochloric acid.
Subjects:	T Technology > T Technology (General) T Technology > TJ Mechanical engineering and machinery
Divisions:	Faculty of Engineering, Science and Mathematics > School of Engineering Sciences
Depositing User:	Mrs Hannah Akinwumi
Date Deposited:	11 Oct 2016 09:42
Last Modified:	11 Oct 2016 09:42
URI:	http://eprints.covenantuniversity.edu.ng/id/eprint/7307

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