Method to increase the specific volume of low-pressure corroded aluminum foil

Abstract

The invention discloses a method for improving specific volume of a low pressure corrosion aluminum foil. The method comprises steps that (1), the aluminum foil is immersed in aqueous phosphoric acidsolution and washed with the water; (2), the treated aluminum foil is subjected to cloth hole etching in the aqueous solution containing hydrochloric acid, sulfuric acid, aluminum trichloride and an emulsion type polyether-siloxane copolymer silicone foam breaker and washed with the water; (3), the treated aluminum foil is subjected to medium treatment in the aqueous solution of hydrogen phosphateor dihydrogen phosphate and washed with the water; (4), the treated aluminum foil is then subjected to deep growth etching in the aqueous solution containing hydrochloric acid, sulfuric acid, aluminum trichloride and an emulsion type polyether-siloxane copolymer silicone foam breaker and washed with the water; (5), the steps (3) and step (4) are repeated for 3-6 times; (6), the treated aluminum foil is then immersed in the aqueous solution of sulfuric acid and washed with the water, the washed aluminum foil is then immersed in the triethanolamine solution and washed with the water; and (7), the aluminum foil is dried. The method is advantaged in that the specific volume of the low pressure corrosion aluminum foil can be improved.

Description

technical field [0001] The invention belongs to the field of electrode materials, in particular to a method for increasing the specific volume of low-pressure corroded aluminum foil. Background technique [0002] Aluminum foil for low-voltage aluminum electrolytic capacitors is used in a corrosive solution containing phosphoric acid, sulfuric acid, nitric acid, oxalic acid, etc. mixed with hydrochloric acid to roughen the surface of the aluminum foil by chemical or electrochemical corrosion, thereby enlarging the surface area of ​​the aluminum foil. The general process steps are pre-treatment, first-level hole-layout corrosion, multi-level frequency conversion deep corrosion, post-treatment and heat treatment. In recent years, the miniaturization of electronic equipment has required smaller and smaller aluminum electrolytic capacitors, and correspondingly, the electrode foil used has been required to have a higher capacitance than before, and the surface area of ​​the alumin...

AI Technical Summary

Problems solved by technology

In the traditional aluminum foil corrosion and electrification process, due to the dissolution of the aluminum foil itself and the electrochemical reduction reaction on the graphite plate, a large amount of hydrogen will be generated, dispersed in the corrosion solution or adsorbed on the surface of the aluminum foil, causing the aluminum foil and graphite plate to Uneven current distribution between

The presence of a large amount of hydrogen hinders the growth of corrosion holes, which in turn affects the uniformity of the distribution of corrosion holes and the area expansion efficiency of the corrosion foil

Images