Pit nucleation behavior of aluminium foil for electrolytic capacitors during early stage of DC etching

The electrode potential of high purity aluminium foils for electrolytic cap acitors moves from a high potential period to a steady period during the ea rly 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 hemisph erical pit to a half-cubic pit. The difference in the number of initial pit s affects the size of the half-cubic pits and the period of pit formation d uring the early stage up to steady potential period. (C) 2000 Elsevier Scie nce Ltd. All rights reserved.