IT1148302B - Electrolytic capacitor aluminium foil etching method - Google Patents
Electrolytic capacitor aluminium foil etching methodInfo
- Publication number
- IT1148302B IT1148302B IT48269/82A IT4826982A IT1148302B IT 1148302 B IT1148302 B IT 1148302B IT 48269/82 A IT48269/82 A IT 48269/82A IT 4826982 A IT4826982 A IT 4826982A IT 1148302 B IT1148302 B IT 1148302B
- Authority
- IT
- Italy
- Prior art keywords
- etching
- aluminium foil
- soln
- treatment
- high frequency
- Prior art date
Links
- 238000005530 etching Methods 0.000 title abstract 8
- 239000005030 aluminium foil Substances 0.000 title abstract 3
- 239000003990 capacitor Substances 0.000 title abstract 2
- 238000000034 method Methods 0.000 title abstract 2
- 239000002253 acid Substances 0.000 abstract 1
- 239000012530 fluid Substances 0.000 abstract 1
- 230000003746 surface roughness Effects 0.000 abstract 1
- 238000005406 washing Methods 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 1
Landscapes
- ing And Chemical Polishing (AREA)
Abstract
Method of etching aluminium foil for electrolytic capacitors gives increased effective surface area by preceding conventional AC etching by high frequency etching. The high frequency treatment produces a skin resistant to etching fluid so maintaining surface roughness during etching. In an example, sheets of aluminium foil 0.1 mm thick and 99.99% or more purity were first subjected to 3 minutes etching treatment at 1-100 kHz using a mixed 60 deg.C mixed processing soln. contg. acid added to an aq. soln. of HCl and then to 3 min AC etching at 60 Hz using the same processing soln. at 60 deg. or less. This was followed by water washing and DC voltage forming treatment. Electrostatic capacity achieved was 29.1-60.1 micro F/cm2, with values increasing as the frequency in the first processing stage was higher.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT48269/82A IT1148302B (en) | 1982-04-21 | 1982-04-21 | Electrolytic capacitor aluminium foil etching method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT48269/82A IT1148302B (en) | 1982-04-21 | 1982-04-21 | Electrolytic capacitor aluminium foil etching method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| IT8248269A0 IT8248269A0 (en) | 1982-04-21 |
| IT1148302B true IT1148302B (en) | 1986-12-03 |
Family
ID=11265602
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IT48269/82A IT1148302B (en) | 1982-04-21 | 1982-04-21 | Electrolytic capacitor aluminium foil etching method |
Country Status (1)
| Country | Link |
|---|---|
| IT (1) | IT1148302B (en) |
-
1982
- 1982-04-21 IT IT48269/82A patent/IT1148302B/en active
Also Published As
| Publication number | Publication date |
|---|---|
| IT8248269A0 (en) | 1982-04-21 |
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