Process for anodizing aluminum foil

Patent · Tue Nov 06 00:00:00 EST 1984

OSTI ID:5815428

Ball, J A; Scott, J W

In an integrated process for the anodization of aluminum foil for electrolytic capacitors including the formation of a hydrous oxide layer on the foil prior to anodization and stabilization of the foil in alkaline borax baths during anodization, the foil is electrochemically anodized in an aqueous solution of boric acid and 2 to 50 ppm phosphate having a pH of 4.0 to 6.0. The anodization is interrupted for stabilization by passing the foil through a bath containing the borax solution having a pH of 8.5 to 9.5 and a temperature above 80/sup 0/ C. and then reanodizing the foil. The process is useful in anodizing foil to a voltage of up to 760 V.

• Assignee: Sprague Electric Company
• Patent Number(s): US 4481083
• OSTI ID: 5815428
• Resource Relation: Patent File Date: Filed date 31 Aug 1983; Other Information: PAT-APPL-528184
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM
ANODIZATION
CAPACITORS
FABRICATION
FOILS
AQUEOUS SOLUTIONS
BORAX
BORIC ACID
ELECTRIC POTENTIAL
ELECTROLYTES
PH VALUE
PHOSPHATES
STABILIZATION
ALKALI METAL COMPOUNDS
BORATES
BORON COMPOUNDS
CHEMICAL COATING
CORROSION PROTECTION
DEPOSITION
DISPERSIONS
ELECTRICAL EQUIPMENT
ELECTROCHEMICAL COATING
ELECTROLYSIS
ELEMENTS
EQUIPMENT
HYDROGEN COMPOUNDS
INORGANIC ACIDS
LYSIS
METALS
MIXTURES
OXYGEN COMPOUNDS
PHOSPHORUS COMPOUNDS
SODIUM COMPOUNDS
SOLUTIONS
SURFACE COATING
360101* - Metals & Alloys- Preparation & Fabrication