Effect of Some Natural Extracts on the Corrosion of Zinc in 0.5 M NaCl

The inhibitive effect of Lupine, Hlfabar and Damssisa extracts on the corrosion of zinc in aqueous solution of 0.5 M sodium chloride were investigated at 30 °C by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. Potentiodynamic polarization curves indicated t...

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Bibliographic Details
Published in:International journal of electrochemical science 2012-07, Vol.7 (7), p.5864-5879
Main Authors: Abd-El-Naby, B.A., Abdullatef, O.A., Abd-El-Gabr, A.M., Shaker, M.A., Esmail, G.
Format: Article
Language:English
Subjects:
adsorption
Corrosion
damssisa
hlfabar
lupine
zinc
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Summary:The inhibitive effect of Lupine, Hlfabar and Damssisa extracts on the corrosion of zinc in aqueous solution of 0.5 M sodium chloride were investigated at 30 °C by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. Potentiodynamic polarization curves indicated that lupine, hlfabar and damssesa act as mixed type inhibitors. EIS measurements showed that the total resistance and consequently the inhibition efficiency increase with increasing concentration of lupine, hlfabar and damssesa indicating the inhibitive effect of these extracts on zinc corrosion. The inhibition of the extract was assumed to occur via adsorption of active ingredients on the metal surface. Theoretical fitting of different isotherms, Langumir, Florry-Huggins and the Kinetic- Thermodynamic model were tested to clarify the nature of adsorption.
ISSN:1452-3981
1452-3981
DOI:10.1016/S1452-3981(23)19448-X