Method of forming an aluminum oxide layer on anode foil for aluminum electrolytic capacitor
US10707024B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 1, 2018 |
| Grant date | Jul 7, 2020 |
| Priority date | — |
| Expiry date | Jul 29, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01G9/055
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method of producing an oxide layer on a foil for use in a capacitor includes immersing the foil in a first solution; maintaining a target current between the immersed anodic foil and the first solution until a first target voltage is reached to form an oxide layer overlying the foil; maintaining the target current between the immersed foil and the first solution until a second target voltage is reached to reform the oxide layer; removing the foil from the first solution and heating the foil; immersing the heat treated foil in a second solution; maintaining the target current between the immersed foil and the second solution until a third target voltage is reached; and discharging the immersed foil after each of the first, second, and third target voltages are reached.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.