Abstract
The study shows that the corrosion of Aluminum increases with increasing HCl concentration which indicates the dependence of Aluminum corrosion on the concentration of HCl .The inhibition efficiency of the corrosion by Aloe extract was found to increase with the increase of Aloe extract concentration. Its inhibitive action from chemical (hydrogen evolution and mass loss) and electrochemical (polarization and impedance) was in good agreement. Also, it was found that Aloe plant act as mixed type inhibitor. The corrosion of Aluminum is mainly controlled by a charge transfer process. The inhibition action occurred through the adsorption of the extract on Aluminum surface, the adsorption process follows Freundlish adsorption isotherm. The addition of iodide ions enhances the inhibition efficiency for Aloe plant extract.
Highlights
Many important applications of Aluminum and its alloys have resulted in researches due to its electrochemical behavior and corrosion resistance in a wide variety of media, including investigation of the properties of the surface oxide film formed naturally or by iodization
The following conclusions may be drawn: 1) The chemical results showed that the corrosion rate of Aluminium sample is increase with increasing acid concentrations (0.25-1.5) M. 2) The polarization measurements showed that, the increase of HCl concentration leads to displacement of the anodic and cathodic curves to high current densities (Icorr.), increase the corrosion rate will be found
3) The electrochemical impedance measurements showed that the corrosion of Aluminium sample is mainly controlled by charge transfer process
Summary
Many important applications of Aluminum and its alloys have resulted in researches due to its electrochemical behavior and corrosion resistance in a wide variety of media, including investigation of the properties of the surface oxide film formed naturally or by iodization Aluminum has high resistance to corrosion in many environments; this is attributed to a protective surface film formed rapidly in air or in neutral aqueous solutions, which is preserved even after long periods of immersion in acidic and alkaline media Hydrochloric acid solutions are normally used for pickling of Aluminum and for its chemical and electrochemical etching to corrosion Chemical and electrochemical methods are applied to study the corrosion behavior of Aluminum in hydrochloric acid. SEM was applied for surface morphology to confirm the obtained results
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