Abstract
A study of the anodization of aluminum in a glycol borate electrolyte at voltages sufficiently high for side reactions to occur, but below the sparking voltage, showed that the formation of barrier oxide was accompanied by solvent oxidation, aluminum dissolution, and production of a thick oxide that grew in cracks of the barrier film. Surprisingly, the presence of the crack network has little effect on electrical properties. It is believed that side reactions initiate at flaws in the barrier oxide.
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