Method for low-pressure soft-state corrosion of aluminum foil

Abstract

The invention discloses a method for the low-pressure soft-state corrosion of an aluminum foil. The method comprises the following steps that: S1, the aluminum foil is prepared, and pretreatment is carried out; S2, electrochemical corrosion is conducted, specifically, the aluminum foil is subjected to electrification corrosion in acid, and water washing is conducted after corrosion is completed; S3, intermediate treatment is performed, specifically, with the aluminum foil adopted as an anode, the aluminum foil is subjected to electrification treatment in an ammonium adipate solution; S4, washing is performed, specifically, the aluminum foil subjected to the intermediate treatment is washed with water; S5, the steps S2 to S4 are repeated until a required aluminum foil corrosion amount is obtained; and S6, after chemical cleaning, water washing is carried out, stabilizing treatment and high-temperature sintering are carried out, so that an etched foil is obtained. In the step S1, the aluminum foil is a to-be-corroded aluminum foil which is also called plain foil. According to the method disclosed by the invention, the ammonium adipate is used for carrying out electrification treatment, so that treatment in a purification chemical method is replaced; the raw materials of the intermediate treatment can be used for a long time, the use of ammonia or phosphorus compounds is avoided,nitrogen and phosphorus emission is reduced, and therefore, cost is low, environmental protection is facilitated, and the specific volume of the etched foil can be increased; compared with the treatment in the purification chemical method, the intermediate treatment can obtain higher specific volume with an aluminum foil with a thickness the same as the thickness of an aluminum foil used in the treatment in the purification chemical method.

Description

technical field [0001] The invention relates to the technical field of corroding foil electrodes, in particular to a method for corroding aluminum foil in a low-pressure soft state. Background technique [0002] The traditional low-pressure hard corrosion process generally consists of front-stage porosity, intermediate treatment activation, secondary corrosion, and post-treatment. It is required that acid activation is required between porosity and secondary corrosion, and the intermediate process cannot be washed, otherwise the surface will be passivated later. corrosion. The hard corrosion process has the disadvantages that the corrosion time is too long, the corrosion process is not easy to control, and chemical corrosion is involved, the distribution of holes obtained is uneven, and the foil yield after corrosion is low. For example, Chinese patent application CN103187176A discloses an etching process for an anode aluminum foil of an electrolytic capacitor, which adopts...

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Problems solved by technology

[0005] The present invention provides a method for low-pressure soft-state corrosion of aluminum foil in order to overcome the disadvantages of the above-mentioned prior art that the medium-treated raw materials cannot be used for a long time, and the discharge of nitrogen and phosphorus causes environmental protection problems. The medium-treated raw materials in this method can be used for a long time. Avoiding the use of ammonia or phosphorus compounds, reducing nitrogen and phosphorus emissions, low cost, environmentally friendly, and can increase the specific volume of corroded foil. Compared with pure chemical treatment, aluminum foil with the same thickness can get higher specific volume

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