Edge formation process for aluminum solid electrolytic capacitor

摘要

A process for edge forming a slit and cut-to-length foil having a dielectric oxide film on its face comprising anodizing the foil in an aqueous oxalic acid electrolyte, further forming the foil in an aqueous citrate electrolyte, preferably dibasic ammonium citrate electrolyte, depolarizing the foil, and then forming the foil in an aqueous phosphate electrolyte, preferably an ammonium dihydrogen phosphate.