Abstract
The corrosion behaviour of Al in citrate solution which forms soluble and stable chelate with the metal has been studied with reference to the pH-potential diagram. Aluminium was scarcely corroded in neutral or acidic citrate solutions despite the expectation from the diagram that the metal would be attacked to form aluminium—citrate chelate, and this has been attributed to the protective surface oxide film on aluminium. Addition of a small amount of F −, however, accelerated the corrosion considerably owing to the formation of an AIF 3 film which is soluble in citrate solution. Therefore citrate ion can attack Al only if the protective oxide film is removed by F − and the predictions of the pH-potential diagram are then valid.
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