Process for anodizing aluminum foil

Details Process for anodizing aluminum foil Process for anodizing aluminum foil

C - Chemistry, Metallurgy

25

D

204/21.5, 204/24

C25D 11/06 (2006.01) C25D 11/08 (2006.01) C25D 11/16 (2006.01)

Patent

CA 1226553

PROCESS FOR ANODIZING ALUMINUM FOIL Abstract of the Disclosure In an integrated process for anodization of alu- minum foil for electrolytic capacitors, aluminum foil hav- ing a hydrous oxide layer is electrochemically anodized in an aqueous solution of boric acid and 2 to 50 ppm phosphate having a pH of 4.0 to 6Ø The anodization is interrupted for stabilization by passing the foil through a bath con- taining a borax solution having a pH of 8.5 to 9.5 and a temperature above 80°C. The foil is reanodized in the boric acid-phosphate solution after the stabilization. The process is useful in anodizing foil to a voltage of up to 760V.

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