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The effects of acetate, citrate, benzoate, tetra-ethylammonium iodide (TEA) and
1,4,8,11 tetra-azacyclo-tetradecane (cyclam) on the corrosion behavior of
aluminum in 1 M HClO4 at 40°C were studied by potentiodynamic
polarization technique. Acetate, citrate, and benzoate inhibited the corrosion
of aluminum and shifted the breakdown potential to positive direction. Cyclam
was investigated as a macrocyclic organic inhibitor to the acid corrosion
of aluminum. The addition of cyclam to the corroding medium showed a pronounced
effect on the anodic but not on the cathodic part of the polarization curve.
The addition of TEA to the medium enhanced the corrosion rate and shifted the
breakdown potential to more negative value as the concentration increased. The
results were discussed on the basis of the adsorption mechanism and the nature
of the adsorbed species.