A geometric model of alternating current etching of aluminum

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Abstract
Prolonged alternating current etching of aluminum foil, to be used as anode of electrolytic capacitors, leads ultimately to a stationary state in which the gain of area deep inside the foil is offset by loss of area at the foil surface. A model is described in which the etching process is assumed to be built up from successive removal of straight strings of cubes starting randomly on the already etched surface. This model explains the evolution of the etch structure. The relations between string length, string width, and width of the etched layer, as well as the area magnification predicted by the model, are consistent with experimental data.

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