Letter | Published:

Structure of Non-porous Anodic Films on Aluminium

Naturevolume 180pages14701471 (1957) | Download Citation



IT is generally assumed that non-porous oxide films formed on valve metals by anodic oxidation in aqueous electrolytes are normally substantially uniform in thickness and composition. By means of optical and electron microscopy and by preferential chemical dissolution, it has been found that this assumption is definitely incorrect for anodic films formed on aluminium. The non-porous oxide films formed when aluminium is polarized anodically at either constant current or constant voltage in a variety of aqueous electrolytes (for example, borates, carbonates, tartrates and phosphates) at room temperature have a pronounced cell type of structure. A modified form of this cell structure has already been reported in porous aluminium oxide films1.

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  1. 1

    Keller, F., Hunter, M. S., and Robinson, D. L., J. Electrochem. Soc., 100, 411 (1953).

  2. 2

    Altenpohl, D., Convention Record of I.R.E. 1954 National Convention, Part 3, p. 35.

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  1. Plessey Co., Ltd., Caswell Research Laboratories, Towcester, Northants

    • R. W. FRANKLIN


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