FOIL OR STRIP OF REFINED ALUMINUM FOR ELECTROLYTICAL CAPACITORS Russian patent published in 2008 - IPC C22F1/04 C22C21/00 H01G9/45 H01G9/55 

FIELD: foil or thin strips of refined aluminum with high purity degree used after treatment of surface by etching for making anodes of electrolytic capacitors, namely high - voltage capacitors.

SUBSTANCE: foil or thin-sheet strip of refined aluminum with purity degree more than 99.9% has surface zone with depth 10 nm containing 5 - 25 at.% of aluminum carbide. Foil or thin strip is produced by casting sheet of refined aluminum; homogenizing and hot rolling, cold rolling and subjecting it to final annealing. The last operation is realized in neutral atmosphere at adding gas containing carbon atoms for forming surface zone with depth 10 nm containing 5 - 25 at.% of aluminum carbide. Gas containing carbon atoms is selected from group including methane, propane, butane, iso-butane, ethylene, acetylene, propene, propyne and butadiene.

EFFECT: foil or strip having improved trend for etching and allowing enhance in addition working characteristics of electrolytic capacitors.

4 cl, 1 tbl, 1 ex