Abstract
The electrode potential of high purity aluminium foils for electrolytic capacitors moves from a high potential period to a steady period during the early stage of DC etching in a hot HCl solution. In this study, the behavior of pit nucleation was investigated. Pits varied in structure from a hemispherical pit to a half-cubic pit. The difference in the number of initial pits affects the size of the half-cubic pits and the period of pit formation during the early stage up to steady potential period.
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