A preparation method of aluminum electrode foil with nanoporous structure for automotive electronics
A microporous structure, aluminum electrode foil technology, used in electrolytic capacitors, circuits, capacitors, etc., can solve the problem of the uniformity of the size and distribution of the etched holes to be further improved, and achieve the purpose of avoiding erosion and pollution, large capacity, and reducing leakage. effect of current
Active Publication Date: 2021-08-10
NANTONG HAIXING ELECTRONICS +2
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Problems solved by technology
The hole expansion effect of the aluminum foil obtained by this method is better, and the mechanical strength of the aluminum foil has been improved, but the size and uniformity of the corrosion pits need to be further improved
Method used
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Embodiment 1
[0037] Example 1: Preparation method of aluminum electrode foil with nanoporous structure for automotive electronics
[0038] (1) Put the low-voltage high-purity electronic aluminum foil in 2 wt% phosphoric acid solution, react at 55°C for 3 minutes, take it out, and react it in a mixed solution of 1 wt% hydrochloric acid and 0.5 wt% sulfuric acid at 50°C 2 minutes;
[0039] (2) Place the pretreated anode foil in a mixed solution composed of 5.0 mol / L hydrochloric acid and 0.2 mol / L sulfuric acid, and conduct electro-corrosion at 30°C to perform three-stage frequency conversion and porosity, and one-stage porosity The frequency of the current is 60 Hz, the frequency of the secondary porosity current is 45 Hz, and the frequency of the tertiary porosity current is 30 Hz;
[0040] (3) Place the porous anode foil in a mixed solution composed of 6.0 mol / L hydrochloric acid, 0.14 mol / L sulfuric acid and 0.07 mol / L oxalic acid, and soak for 180 s at 85°C for intermediate treatment; ...
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Abstract
The invention discloses a method for preparing an aluminum electrode foil with a nano-microporous structure for automotive electronics, which includes two parts: corrosion and formation. The corrosion process includes two steps of pretreatment, multi-stage porosity, intermediate treatment, multi-stage reaming, post-treatment, cleaning, heat treatment, etc.; the formation process includes pretreatment, multi-stage formation, phosphoric acid treatment, primary repair formation, heat treatment, secondary The steps of repairing, forming, drying and so on. The two pre-treatments can fully expose the corrosion pits on the surface of the aluminum foil while ensuring the cleaning effect, avoiding invalid holes and parallel holes in the subsequent treatment, more uniform corrosion pit size and distribution, and improved surface expansion efficiency; during the corrosion process Combining post-processing steps and heat treatment, a thin layer of porous aluminum oxide oxide layer is formed on the surface of the corroded foil, which can prevent it from being corroded and polluted during storage and transportation, and can also reduce energy consumption during formation.
Description
technical field [0001] The invention belongs to the technical field of capacitor manufacturing, and in particular relates to a method for preparing an aluminum electrode foil with a nanoporous structure for automotive electronics. Background technique [0002] Aluminum electrolytic containers for automotive electronics not only need to have the characteristics of strong reliability and high stability, but also take into account the development needs of miniaturization and shrinkage. The capacitance of an aluminum electrolytic capacitor is determined by the capacitance of the anode foil. [0003] Therefore, under the premise of a certain capacitor capacity, the higher the specific capacitance of the anode foil used, the smaller the volume of the capacitor. In order to obtain a larger specific surface area, the aluminum foil etching method is crucial. At present, the aluminum foil manufacturing industry uses chemical corrosion to prepare corroded aluminum foil. The size and ...
Claims
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IPC IPC(8): C25F3/04C25D11/12C25D11/06C22F1/04C21D1/26C23F17/00C21D9/46H01G9/055H01G9/045
CPCC25F3/04C25D11/12C25D11/06C22F1/04C21D1/26C23F17/00C21D9/46H01G9/055H01G9/045H01G13/00H01G9/048
Inventor 王建中何桂丽金学军王贵州龚煜宋双喜肖飞
Owner NANTONG HAIXING ELECTRONICS