Ac etching of aluminum capacitor foil

Details Ac etching of aluminum capacitor foil Ac etching of aluminum capacitor foil

C - Chemistry, Metallurgy

25

F

204/86.5

C25F 3/04 (2006.01) C25F 3/20 (2006.01) H01G 9/04 (2006.01)

Patent

CA 1213560

AC ETCHING OF ALUMINUM CAPACITOR FOIL Abstract of the Disclosure In the AC etching of aluminum foil in a hydro- chloric acid electrolyte containing at least one additive, the presence of 200 to 500 ppm sulfate permits etching thicker foil for higher voltage use than is possible with- out the sulfate. The additive is chosen from phosphoric, nitric, and tartaric acids or salts. The presence of the relatively small amount of sulfate yields a foil with higher capacitance and generally allows lower temperatures and frequencies to be used during the etching process.

434603

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