Method for the production of an aluminum foil for electrolytic _capacitors, and electrolytic capacitors thus produced
First Claim
1. In a method for the production of an aluminum foil suitable for use in an electrolytic capacitor, which comprises subjecting an aluminum foil to anodic etching in an etching bath containing an electrolyte and a counter-electrode by means of direct current superimposed by current pulses, the improvement which comprises immersing said aluminum foil in a satination bath to improve the uniformity of surface properties of said foil before said anodic etching, wherein said satination bath contains a hydrogen halide acid or a salt thereof and has a Cb value of from 2 to about 5 Cb/cm2.
1 Assignment
0 Petitions
Accused Products
Abstract
Method for producing an aluminum foil for use in electrolytic capacitors, wherein an aluminum foil is subjected to treatment in a satination bath prior to conventional anodic etching. The satination bath gives the foil a more uniform surface condition, so that the subsequent etching occurs in a more uniform manner.
-
Citations
14 Claims
- 1. In a method for the production of an aluminum foil suitable for use in an electrolytic capacitor, which comprises subjecting an aluminum foil to anodic etching in an etching bath containing an electrolyte and a counter-electrode by means of direct current superimposed by current pulses, the improvement which comprises immersing said aluminum foil in a satination bath to improve the uniformity of surface properties of said foil before said anodic etching, wherein said satination bath contains a hydrogen halide acid or a salt thereof and has a Cb value of from 2 to about 5 Cb/cm2.
- 8. In a method for the production of an aluminum foil suitable for use in an electrolytic capacitor, which comprises subjecting an aluminum foil to anodic etching in an etching bath containing an electrolyte and a counter-electrode by means of pulsating direct current, the improvement which comprises immersing said aluminum foil in a satination bath to improve the uniformity of surface properties of said foil before said anodic etching, wherein said satination bath contains a hydrogen halide acid or a salt thereof and has a Cb value of from 2 to about 5 Cb/cm2.
Specification