Edge formation process without anodizing for aluminum solid electrolytic capacitor
AssigneeKemet Electronics Corporation
InventorsPhilip Michael Lessner, Albert Kennedy Harrington, Brian John Melody, John Tony Kinard
Life of this patent
Estimating the term…
Abstract
Edges of a slit and cut to length foil having a dielectric oxide film on at least one surface are edge formed by edge forming the foil in an aqueous citrate electrolyte, preferably an aqueous ammonium citrate electrolyte, depolarizing the foil, and then edge forming the foil in an aqueous phosphate electrolyte, preferably an ammonium dihydrogen phosphate electrolyte. Using this formation process, a foil with excellent hydration resistance and capacitance is produced.
Claims14
A process for edge forming a foil having a dielectric oxide film on at least one surface and slit and cut-to-length comprising edge forming the foil in an aqueous citrate electrolyte, then depolarizing the foil, and then edge forming the foil in an aqueous phosphate electrolyte wherein the foil is not anodized in an aqueous acid electrolyte prior to forming the foil in an aqueous citrate electrolyte.
A process for edge forming an aluminum foil having a dielectric oxide film on at least one surface and slit and cut-to-length comprising edge forming the foil in an aqueous ammonium citrate electrolyte, then depolarizing the foil, and then edge forming the foil in an aqueous ammonium dihydrogen phosphate electrolyte wherein the foil is not anodized in an aqueous acid electrolyte prior to forming the foil in an aqueous ammonium citrate electrolyte.
Dependencies are inferred from the claim text.