A method for preparing medium and high voltage etched foil with pulsed DC superimposed current

Abstract

The invention relates to a method for preparing medium and high voltage corroded foils with pulsed DC superimposed current, comprising the following steps: the first treatment, the first two treatments, the first-level perforation, the intermediate treatment, the second-level perforation and the post-treatment. The first treatment uses a strong alkaline solution to remove the oxide film on the surface of the aluminum foil, and the first two treatment uses a strong acid solution to neutralize the residual alkaline solution on the surface of the aluminum foil. The radius and depth of the hole, the secondary pores chemically erode the residual aluminum ions on the surface of the aluminum foil through post-treatment. The electrostatic specific capacity of the corroded foil has excellent mechanical properties at the same time, which solves the limitation that the power cannot be cut off during the hole formation process in the traditional corrosion process.

Description

technical field [0001] The invention relates to the field of preparation of medium and high voltage anode corroded foil, in particular to a method for preparing medium and high voltage corroded foil with pulse direct current superimposed current. [0002] technical background [0003] The traditional medium and high voltage anode foil uses a chromic acid corrosion system. The advantage is that due to the strong corrosion ability of chromic acid itself, the current required is small, and it has great advantages in terms of heat generation and static specific volume. However, due to the chromium The acid system is facing more and more serious environmental protection pressure, foreign countries have basically stopped using it, and domestic enterprises are actively eliminating it. [0004] At present, the mainstream corrosion process at home and abroad is generally a mixed acid system of sulfuric acid and hydrochloric acid. The basic process includes pretreatment→first-level hol...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the defects and deficiencies of the prior art, and propose a method for preparing medium and high voltage anode foil corroded foils with pulsed DC superimposed current, which can solve the problem of uneven holes and excessive heat generation in the process of primary hole formation. Problems such as high weight loss rate, low mechanical properties and low electrostatic specific capacity caused by erosion during the secondary expansion process

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