Abstract
In this paper, oscillatory electrodissolution of Al in perchloric acid solutions has been investigated. The Al/HClO 4 system is a new electrochemical oscillator and particularly, current oscillations occur over a large range of HClO 4 concentration and over a wide scale of applied potential. The effects of the applied potential and the HClO 4 concentration on the current oscillations have been studied. The results are discussed in terms of the formation and dissolution of the surface oxide film. During the anodic dissolution of the Al electrode in HClO 4 solutions, perchlorate ions are reduced to chloride ions, by which, pitting corrosion is induced. The surface morphologies of Al electrodes observed using an environmental scanning electron micrograph show that it is pitting corrosion that induces the current oscillations.
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