Abstract
The electrode potential and the corrosion rate of aluminium were measured in 0.001–2 M NaOH solutions at 30°C. Up to 0.005 M (pH 11.7) the potential was found to be independent of concentration, whereas the corrosion rate is proportional to the alkali concentration. Hence, the corrosion process is diffusion-controlled. Within the concentration range 0.01–0.5 M (pH 12–13.5), the potential decreases at a gradient of 51 mV pH−1 and the corrosion rate is almost proportional to the square root of concentration. These results were discussed in the light of the kinetics of the anodic and cathodic reactions. Above 0.5 M, both the potential and corrosion rate increase rapidly with concentration. This was attributed to adsorption of Na+ ions, which leads to the formation of active cathodic areas at the expense of the anodic ones.
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