The effect of aqueous extracts of Damsissa, Lupine and Halfa-bar on the corrosion of 7075-T6 aluminium alloy in an aqueous solution of 0.5M sodium chloride has been studied employing electrochemical impedance spectroscopy and potentiodynamic polarization techniques. The impedance (Nyquist) plots manifested that the dissolution process is controlled by charge transfer from anodic to cathodic sites. The polarization curves showed that the three extracts act as cathodic inhibitors. Inhibitive mechanism was discussed assuming the adsorption of the three extracts on the electrode surface. Theoretical fitting of Langmuir, Flory-Huggins adsorption isotherms and the kinetic- thermodynamic model were tested to clarify the adsorption mechanism.
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Fetouh et al. (2014) studied this question.
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