Method for manufacturing medium and high-voltage anode aluminum foil for aluminum electrolytic capacitor

Abstract

The invention discloses a method for manufacturing a medium and high-voltage anode aluminum foil for an aluminum electrolytic capacitor, which sequentially comprises the following steps of: 1) pretreating an optical foil; 2) putting the optical foil into acid solution in a ratio of chloride ion to sulfate ion of 5-15:1, then applying an alternating current with the current density of 60 to 100mA / cm<2> to the optical foil for primary corroding and hole forming, then putting the optical foil into acid solution in the ratio of the chloride ion to the sulfate ion of 1:9.5-16, and then applying a direct current with the current density of 250 to 300mA / cm<2> to the optical foil for primary corroding and hole forming; 3) after primary cleaning, performing secondary corroding and reaming on the optical foil in the acid solution; 4) after secondary cleaning, drying the optical foil by using a drying furnace to obtain the corroded foil finished product; and 5) performing conversion coating on the corroded foil finished product to obtain the medium and high-voltage anode aluminum foil finished product. In the method for manufacturing the medium and high-voltage anode aluminum foil for the aluminum electrolytic capacitor provided by the invention, the surface dislocation and defect parts of the optical foil are subjected to pitting by the alternating current, and then the optical foil is subjected to primary corroding and hole forming by the direct current, so that heating is reduced, the deformation of the aluminum foil because of heating is prevented, the surface expansion rate of the aluminum foil is increased, and specific volume is improved greatly.

Description

technical field [0001] The invention relates to a method for manufacturing an anode aluminum foil, in particular to a method for manufacturing a medium-high voltage anode aluminum foil for an aluminum electrolytic capacitor. Background technique [0002] With the rapid development of the electronic industry, the application of aluminum electrolytic capacitors is more extensive, and the performance requirements are getting higher and higher. Corrosion formed foil for aluminum electrolytic capacitors is the main electronic material for basic components in the electronic information industry, and the market for aluminum foil for medium and high voltage aluminum electrolytic capacitors is in short supply. As a corroded foil for medium and high voltage electrolytic capacitors with a rated voltage exceeding 200V, the quality requirements are high and the production is difficult. There are only a few manufacturers in China, but the performance cannot meet the user's requirements. T...

AI Technical Summary

Problems solved by technology

When corroding the pores once, the light foil is sent from the copper roll to the acid tank for DC electrolytic corrosion. The DC current is generally greater than 5000A, so it is easy to cause heat expansion and deformation of the light foil, thus affecting the corrosion effect

In addition, copper rolls are consumables, and heat generation will affect the service life of copper rolls and increase production costs