Use of nonafluorobutanesulfonic acid in a low pH etch solution to increase aluminum foil capacitance
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United States of America Patent
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Mar 26, 2019
Grant Date -
Jun 7, 2018
app pub date -
Mar 15, 2017
filing date -
Dec 2, 2016
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Abstract
Anode foil, preferably aluminum anode foil, is etched using a process of treating the foil in an electrolyte bath composition comprising a perfluoroalkylsulfonate, a sulfate, a halide, and an oxidizing agent. The anode foil is etched in the electrolyte bath composition by passing a direct current charge through the bath. The etched anode foil is suitable for use in an electrolytic capacitor.
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