Formed foil for aluminum electrolytic capacitor and production process thereof

Abstract

The invention relates to a formation foil for an aluminium electrolytic capacitor and a production process of the formation foil. The production process comprises the following steps of 1) performing pretreatment on an electrolytic corrosion foil; 2) performing liquid spraying and four-stage formation on an aluminium foil by a formation solution; 3) cleaning; 3) performing sheet burning; 5) performing five-stage formation and six-stage formation on the four-stage formed foil to obtain six-stage formed foil; 6) performing after treatment; and 7) cleaning the six-stage formed foil after the foil is subjected to after treatment, and putting into a drying oven to be dried. According to the formation process of the formation foil for the aluminium electrolytic capacitor disclosed by the invention, a technology of spraying by formation groove liquid is added, so that impurities in corrosion holes can be effectively removed and surface fiber-shaped aluminium oxide crystals can be dissolved, and growth of outer layer hydrate is controlled; and a compact oxide film is generated through six-stage formation, so that specific capacity and anti-bending strength of the formation foil are further improved.

Description

Technical field [0001] The invention relates to a formed foil and its production process, in particular to a formed foil for aluminum electrolytic capacitors and its production process. Background technique [0002] The basic structure of a general-purpose aluminum electrolytic capacitor is a foil-wound structure, which is made up of 4 layers of overlapped and wound anode aluminum foil, electrolytic paper, cathode aluminum foil, and electrolytic paper. The working medium is to form an oxide film on the surface of the aluminum foil through anodizing, and this oxide film dielectric layer is combined with the anode of the capacitor to form a complete system. The selected anode foil and cathode foil are usually formed foils after corrosion treatment. The reason is that corrosion can make the surface area of ​​the aluminum foil much larger than its apparent surface area, so that a large electrostatic capacity can be obtained after formation (energization). Effective use of its actual...

AI Technical Summary

Problems solved by technology

[0006] However, with this production process, the oxide film produced during the chemical formation process is relatively thick, and it is easy to block the micropores in the corroded aluminum foil, reducing the surface area of ​​the oxide film, and the quality of the obtained oxide film is low. Therefore, the prepared formed foil has the defects of low mechanical strength and low specific volume in actual work, which cannot meet the needs of producing aluminum electrolytic capacitors