Abstract
The inhibition efficiency of different concentrations of Azwain seed extract on the corrosion of Aluminium in 0.5N HCl solution was investigated by weight loss method, electrochemical and surface analysis techniques. Results of weight loss method indicated a increase in inhibition efficiency (IE) up to a particular concentration of Azwain seed extract then a decrease on the samewith increasing inhibitor concentration. Polarization study revealed that Azwain seed extract controls both the anodic and the cathodic reactions. AC impedance spectra showed that a protective film is formed on the metal surface. The nature of the metal surface was analysed by Scanning electron microscopy (SEM). Adsorption of extract on the Aluminium surface was found to obey Longmuir and frumkin adsorptionisotherms. The thermodynamic parameters were calculated and discussed.
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