Anodization of aluminum electrolytic capacitor foil

Details Anodization of aluminum electrolytic capacitor foil Anodization of aluminum electrolytic capacitor foil

H - Electricity

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H01G 9/04 (2006.01) C25D 11/06 (2006.01) C25D 11/10 (2006.01) C25D 11/12 (2006.01) C25D 11/18 (2006.01)

Patent

CA 1252062

ANODIZATION OF ALUMINUM ELECTROLYTIC CAPACITOR FOIL Abstract of the Disclosure Aluminum electrolytic capacitor foil is anodized at an average current density of at most 3 mA/cm2 in an aqueous electrolyte of a G4 to C7 unsubstituted aliphatic dicarboxylic acid containing 0 to 0.05 wt% of citric acid or tartaric acid and preferably at above 70°C. The ano- dized foil is subjected to a relaxation and reanodization treatment to stabilize the foil. The anodization at low current density promotes high crystalline oxide content of the barrier layer oxide, and the relaxation and reano- dization ensure a stable barrier layer oxide of increased capacitance.

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