Aluminum oxide films, prepared by anodizing aluminum in sulfuric acid solution, were isolated from the metal and studied. An impedance cell was developed in which the electrical properties of the films were investigated.

Results indicate that the pores in the film are partially blocked by hot water or steam sealing treatments. Also, it is shown that the boehmite, formed during sealing, results from hydration of the pre-existing oxide film rather than from corrosion of the aluminum metal. 3.8.4

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Copyright 1959 by the National Association of Corrosion Engineers.
1959
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