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Vol. 28 No. 11 (2016): Vol 28 Issue 11

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Natural Products as Corrosion Inhibitor for Steel in 0.5 M Hydrochloric Acid Solution

https://doi.org/10.14233/ajchem.2016.20090
M.A. Al-Khaldi
Department of Chemistry, College of Science, University of Dammam, P.O. Box 1982, Dammam 31441, Saudi Arabia

Corresponding Author(s) : M.A. Al-Khaldi

dr.mishaelkhaldi@yahoo.com

Asian Journal of Chemistry, Vol. 28 No. 11 (2016): Vol 28 Issue 11

Abstract

The corrosion inhibition of steel in 0.5 M HCl by lemon leaves extracts with saffron, almonds, guava leaves and Origanum majorana extracts was studied using electrochemical polarization and EIS methods. The result indicate that the corrosion current density (Icorr) of steel increases on increasing the concentration of lemon leaves extracts while adding of each saffron, almonds, guava leaves and Origanum majorana extracts to solution of lemon leaves extracts in 0.5 M HCl increasing the inhibition efficiency of steel by decreasing corrosion current density and increasing charge-transfer resistance (Rct) with increasing the concentration of saffron, almonds, guava leaves and Origanum majorana extracts in the following order: Origanum majorana > Guava leaves » Almonds > Saffron. The effect of temperature on the corrosion behaviour of steel indicates that inhibition efficiency of the lemon leaves with saffron, almonds, guava leaves and Origanum majorana extracts decreases with the rise of temperature. The adsorption isotherm of inhibitors extracts on the steel has been determined and found to follow Langmuir adsorption isotherm where the negative value of free energy of adsorption indicates that the adsorption of the inhibitors components on the steel surface occurs spontaneously.

Keywords

Inhibition Corrosion Steel EIS Polarization Lemon leaves Saffron Almonds Guava leaves Origanum majorana
Al-Khaldi, M. (2016). Natural Products as Corrosion Inhibitor for Steel in 0.5 M Hydrochloric Acid Solution. Asian Journal of Chemistry, 28(11), 2532–2538. https://doi.org/10.14233/ajchem.2016.20090
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