| 摘要 |
Aluminium foil of at least 99.8% purity for the production of electrolytic capacitors is annealed at a temperature of at least 500 DEG C. in an inert atmosphere. The time of annealing is preferably 10-100 minutes, and the atmosphere should contain less than 5% by weight of oxygen, and should have a dewpoint of below 10 DEG C. Suitable gases are nitrogen, carbon dioxide, or a mixture thereof, or a dried combustion gas containing .carbon dioxide.9-15% .carbon monoxide.0-3% .hydrogen.0-3% .nitrogen.balance As exemplified foil was heated at 20 DEG C./hour to the annealing temperature, maintained thereat for 30 minutes and cooled at 20-50 DEG C./hour. |
