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Formed foil, preparation method and application thereof

A technology of forming foil and three-stage forming, which is applied in the field of aluminum foil manufacturing to achieve the effect of reducing corrosion ability, promoting defect exposure and improving quality

Active Publication Date: 2020-03-24
DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if there is no related phosphoric acid depolarization treatment, the oxide film defects formed during the step-by-step formation process cannot be exposed and repaired, and the final formed oxide film still has many defects.

Method used

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  • Formed foil, preparation method and application thereof
  • Formed foil, preparation method and application thereof
  • Formed foil, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Pretreatment: After cleaning the conventional medium and high pressure corroded foil, place it in a mixed solution of oxalic acid + boric acid for constant current oxidation treatment, wherein the concentration of oxalic acid in the solution is 1%, the concentration of boric acid is 0.5%, and the solution temperature is 35°C , current density 60mA / cm 2 , processing time 10min.

[0027] (2) Three-stage formation: After the electrode foil is washed with pure water, the electrode foil is placed in a solution of boric acid + boron ammonium for three-stage step-by-step voltage formation to a voltage of 460V, wherein the temperature of the bath solution is controlled at 45°C .

[0028] (3) The first high-temperature heat treatment: the formed foil was treated at a temperature of 300° C. for 4 minutes.

[0029] (4) First supplementary formation: After heat treatment, the formed foil is placed in a solution of boric acid + boron ammonium, and a 460V constant voltage prima...

Embodiment 2

[0037] (1) After cleaning the routinely used medium and high pressure corrosion foil, place it in a mixed solution of oxalic acid + boric acid for constant current oxidation treatment. The concentration of oxalic acid in the solution is 3%, the concentration of boric acid is 1%, the solution temperature is 35°C, and the current density is 30mA / cm 2 , processing time 15min.

[0038] (2) After the electrode foil is washed with pure water, the electrode foil is placed in a solution of boric acid + ammonium borate for 3-stage step-by-step voltage conversion to a voltage of 460V; the temperature of the bath solution is controlled at 45°C.

[0039] (3) The formed foil is placed at a temperature of 350° C. for 2 minutes.

[0040] (4) After heat treatment, the formed foil is placed in a solution of boric acid + boron ammonium, and a 460V constant voltage primary supplementary forming treatment is performed at 85°C.

[0041] (5) Put the chemically formed foil in a 3% phosphoric acid ...

Embodiment 3

[0048] (1) After cleaning the routinely used medium and high pressure corrosion foil, place it in a mixed solution of oxalic acid + boric acid for constant current oxidation treatment. The concentration of oxalic acid in the solution is 5%, the concentration of boric acid is 2%, the solution temperature is 15°C, and the current density is 10mA / cm 2 , processing time 30min.

[0049] (2) After the electrode foil is washed with pure water, the electrode foil is placed in a solution of boric acid + ammonium borate for 3-stage step-by-step voltage conversion to a voltage of 460V, and the temperature of the bath solution is controlled at 45°C.

[0050] (3) The formed foil is placed at a temperature of 400° C. for 2 minutes.

[0051] (4) After heat treatment, the formed foil is placed in a solution of boric acid + boron ammonium, and a 460V constant voltage primary supplementary forming treatment is performed at 85°C.

[0052] (5) Put the chemically formed foil in a 5% phosphoric a...

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Abstract

The embodiment of the invention discloses a method for preparing a formation foil. The method comprises the following steps that the corrosion foil is placed in the treatment liquid for constant-current oxidation treatment; the treatment liquid comprises oxalic acid with the mass concentration of 1-5% and boric acid with the mass concentration of 0.5%-2%; and the second sub-formation comprises thefollowing steps that the aluminum foil subjected to the first phosphating treatment is placed in a mixed solution of boric acid and ammonium borate, and a direct-current superposition pulse power source is used for processing. The corrosion foil is subjected to anodic oxidation treatment by using a mixed solution of the oxalic acid and the boric acid, on one hand, the acidity of the solution is better controlled due to the introduction of boric acid, and the corrosion resistance of the solution to the corrosion foil is reduced; on the other hand, the oxidation film formed in the anodic oxidation process is more compact, so that the formed porous oxide film is more stable in subsequent formation; the direct-current superposition pulse power supply is used for processing, so that the defectis exposed and repaired, the number of defects of the formation foil oxidation film is reduced, and the quality of the formation foil is further improved.

Description

technical field [0001] The embodiments of the present invention relate to the field of aluminum foil manufacturing, in particular to a chemically formed foil, a preparation method and its application. Background technique [0002] With the rapid development of electronic technology, further improving the ripple resistance of aluminum electrolytic capacitors can meet the needs of the existing electronic market development. Especially in capacitors used in fields such as electric welding machines, flash lamps, and high-energy storage and fast charging and discharging, the requirements for capacitor ripple resistance are more stringent. Formed foil, as the core material for the preparation of aluminum electrolytic capacitors, is the key to improving the performance of capacitors. The existing methods for preparing medium and high pressure formed foils generally include steps such as boiling, multi-stage formation, depolarization treatment, reformation, and post-treatment. Amo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/08C25D5/18C25D5/44C25D5/50H01G9/055
CPCC25D5/18C25D5/44C25D5/50C25D11/08H01G9/055
Inventor 邓利松余英凤
Owner DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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