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US 11,230,794 B2Granted
Use of nonafluorobutanesulfonic acid in a low PH etch solution to increase aluminum foil capacitance
AssigneePacesetter, Inc.
InventorsRalph Jason Hemphill, Timothy R. Marshall
Life of this patent
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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.
Claims20
An aqueous electrolyte bath composition for etching anode foil, comprising:
- a sulfate;
- a halide;
- an oxidizing agent;
- and
- a C1-C8 perfluoroalkylsulfonate in an amount ranging from about 10 to 90 parts per million (ppm).
2 more elements
A method of etching an anode foil, comprising:
- passing a direct current (DC) charge through an anode foil while the anode foil is immersed in an aqueous electrolyte bath, wherein said aqueous electrolyte bath comprises:
- a sulfate;
- a halide;
- an oxidizing agent;
- and
- a C1-C8 perfluoroalkylsulfonate in an amount ranging from about 10 to 90 parts per million (ppm);
- such that the anode foil is etched.
4 more elements
Dependencies are inferred from the claim text.