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Vol. 26 No. 22 (2014): Vol 26 Issue 22

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Inhibition of Steel Corrosion in Natural Seawater Using Natural Inhibitor (Algae)

https://doi.org/10.14233/ajchem.2014.17907
Saedah R. Al-Mhyawi
Department of Chemistry, Sciences Faculty for Girls, King Abdulaziz University, P.O. Box 2321, Jeddah 21451, Saudi Arabia

Corresponding Author(s) : Saedah R. Al-Mhyawi

sraszyad@yahoo.com

Asian Journal of Chemistry, Vol. 26 No. 22 (2014): Vol 26 Issue 22

Abstract

Department of Chemistry, Sciences Faculty for Girls, King Abdulaziz University, P.O. Box 2321, Jeddah 21451, Saudi Arabia Corresponding author: E-mail: sraszyad@yahoo.com Chemical (weight loss) and electrochemical (potential dynamic polarization and electrochemical impedance spectroscopy) measurement were applied to evaluate the potential of algae for inhibiting the corrosion of steel in sea water (0.5 M NaCl). It was found that the inhibition efficiency increases with the increase of algae concentration. Adsorption of inhibitor species was found to follow Langmuir and Dubinin-Radushkevich isotherm models and the ability of algae species to be adsorbed physically on the steel surface was illustrated by Dubinin-Radushkevich isotherm parameters. The data obtained from chemical and electrochemical measurements are in reasonably good agreement. Physical adsorption mechanism of algae species on steel surface in sea water becomes clear cut by following the trend of inhibitor adsorption with solution temperature. Inhibition was found to increase with increasing concentration of the extract but decreases with increasing temperature. The associated activation parameters were determined and discussed.

Keywords

Corrosion inhibition Steel NaCl (sea water) Algea Langmuir Dubinin-Radushkevich Physical adsorption
R. Al-Mhyawi, S. (2014). Inhibition of Steel Corrosion in Natural Seawater Using Natural Inhibitor (Algae). Asian Journal of Chemistry, 26(22), 7804–7810. https://doi.org/10.14233/ajchem.2014.17907
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