PREPARATION OF ALUMINIUM FOIL CAPACITOR ELECTRODES

摘要

Aluminum capacitor foil which has been etched for low-voltage applications is rendered usable in intermediate to high voltage capacitors by anodizing the foil in two-stages; first a low voltage stage in an adipate electrolyte and then a higher voltage stage in a borate electrolyte. The fine etch structure of the low-voltage etch is thereby not plugged in the second, higher voltage formation stage, whereby the foil is suitable for intermediate to high-voltage capacitor use.