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Hydration treatment method for reducing leakage current of formed foil

A technology of hydration treatment and foil hydration, applied in circuits, capacitors, electrical components, etc., can solve the problems of large leakage current, smaller holes, and blockage of the formed foil, and achieves the solution of hole blockage, increased density, and increased specific volume. Effect

Active Publication Date: 2020-12-01
DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problem of relatively large leakage current of the formation foil used in the prior art for aluminum electrolytic capacitors, especially in the ultra-high voltage formation process, the existence of the hydration film causes the pores of the later formation to become smaller and blocked. A method for reducing the leakage current of the formed foil, which can effectively improve the leakage performance of the formed foil, increase the specific capacity, prolong the service life of the capacitor, and is easy to operate, and can improve the production efficiency of the formed foil

Method used

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  • Hydration treatment method for reducing leakage current of formed foil
  • Hydration treatment method for reducing leakage current of formed foil

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preparation example Construction

[0029] According to an embodiment of the present invention, a method for preparing a chemically formed foil is provided, comprising: performing a hydration treatment on the corroded foil, and then performing a four-stage chemically formed,

[0030] The hydration treatment is: placing the corroded foil in an aqueous solution comprising component A, component B and component C, the component A containing SO 4 2- The substance, the component B is a weak acid, and the component C is a weak acid salt.

[0031] As a preferred embodiment of the present invention, the component A is sulfuric acid or / and sulfate, and the sulfate can include ammonium sulfate, aluminum sulfate, sodium sulfate, etc., but is not limited thereto.

[0032] According to the embodiment provided by the present invention, the component A is at least one of sulfuric acid, ammonium sulfate, aluminum sulfate, and sodium sulfate.

[0033] As a more preferred embodiment of the present invention, in the aqueous solu...

Embodiment 1

[0045] In this embodiment, the preparation method of chemically formed foil provided includes: performing hydration treatment on the corroded foil and then four-stage chemical formation; wherein the hydration treatment process is as follows:

[0046] The corroded foil was hydrated in an aqueous solution of sulfuric acid, oxalic acid and ammonium oxalate, wherein the concentration of sulfuric acid was 0.002mL / L, the concentration of oxalic acid was 0.05g / L, and the concentration of ammonium oxalate was 0.002mL / L. It is 5g / L; the processing condition is: boiling in water for 12min at 95°C.

Embodiment 2

[0048] In this embodiment, the preparation method of chemically formed foil provided includes: performing hydration treatment on the corroded foil and then four-stage chemical formation; wherein the hydration treatment process is as follows:

[0049] Hydrate the corroded foil in an aqueous solution of ammonium sulfate, oxalic acid, and ammonium oxalate, wherein the concentration of ammonium sulfate is 5 g / L, the concentration of oxalic acid is 0.05 g / L, and the concentration of ammonium oxalate is 0.05 g / L. The concentration is 5g / L; the treatment conditions are: boiling in water for 12 minutes at 95°C.

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Abstract

The invention provides a method for reducing leakage current of a formed foil, and particularly relates to a solution for hydration treatment of the formed foil and a hydration treatment method. The solution is an aqueous solution containing a component A, a component B and a component C. The component A is a substance containing SO4<2->, the component B is weak acid, and the component C is weak acid salt. According to the formed foil obtained by performing hydration treatment in the aqueous solution, the generated hydrated alumina layer is more compact, the problem of hole blockage caused bythe thickness of an alumina film in the ultrahigh-voltage formation process is solved, the leakage current is reduced, the specific volume is improved, and the service life of the aluminum electrolytic capacitor is prolonged.

Description

technical field [0001] The invention belongs to the technical field of electrode materials for capacitors, in particular relates to a method for reducing the leakage current of formed foil, and more particularly relates to a solution for hydration treatment of formed foil and a hydration treatment method. Background technique [0002] The current manufacturing method of ultra-high voltage electrode foil for aluminum electrolytic capacitors requires a step of boiling pure water before electrochemical conversion treatment. By boiling pure water, the power consumption required for electrochemical conversion can be reduced, and the electrostatic capacitance after electrochemical conversion can be made high. However, the reactivity of aluminum and water is high, and the hydration reaction between the aluminum electrode and water is relatively intense when pure water is boiled. Therefore, the hydrated film generated by boiling pure water is porous and has many defects. At presen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/055
CPCH01G9/055
Inventor 谢文娟邓利松康英茜徐健肖远龙
Owner DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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