Preparation method of electrode foil for aluminum electrolytic capacitor

A technology for aluminum electrolytic capacitors and electrode foils, which is applied in the direction of ion implantation plating, coating, metal material coating technology, etc., can solve the problems of high discrete rate of electrostatic capacity of electrode foil, high components of waste acid treatment, low bending strength, etc. problems, to achieve the effect of increasing environmental protection and the utilization of ingredients, good uniformity of pores and bending performance, and reducing production costs

Active Publication Date: 2021-06-25
FOSHAN UNIVERSITY
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  • Claims
  • Application Information

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Problems solved by technology

[0004] Based on this, in order to solve the problems of poor environmental protection in the preparation of electrode foils in the prior art, high components of waste acid treatment, high dispersion rate of electrostatic capacity of electrode foils, and low bending strength, the present invention provides a preparation of electrode foils for aluminum electrolytic capacitors. method, the specific technical scheme is as follows:

Method used

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  • Preparation method of electrode foil for aluminum electrolytic capacitor
  • Preparation method of electrode foil for aluminum electrolytic capacitor
  • Preparation method of electrode foil for aluminum electrolytic capacitor

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[0025] A method for preparing an electrode foil for an aluminum electrolytic capacitor in an embodiment of the present invention comprises the following steps:

[0026] Soak the aluminum foil in the pretreatment solution at a temperature of 55°C to 75°C for 45s to 75s to obtain the aluminum foil soaked in the pretreatment solution and the pretreatment waste liquid;

[0027] Place the aluminum foil soaked in the pretreatment solution in the vacuum chamber of the coating machine for nano-titanium plating treatment;

[0028] Place the aluminum foil coated with nano-titanium in the first mixed treatment solution at a temperature of 45°C to 82°C for 50s to 85s, drain for 10s to 20s, and then spray at a flow rate of 10L / h to 15L / h Next, continue spraying with the first mixed treatment solution for 0.5h to 3h to obtain the aluminum foil treated with the first mixed treatment solution and the first mixed treatment waste liquid;

[0029] Mixing the pre-treatment waste liquid and the f...

Embodiment 1

[0047] A method for preparing an electrode foil for an aluminum electrolytic capacitor, comprising the following steps:

[0048] An aluminum foil with a purity of 99.99% and a thickness of 120 μm was placed in a pretreatment solution at a temperature of 55°C and soaked for 45 seconds to obtain an aluminum foil soaked in the pretreatment solution and a pretreatment waste liquid. Said pretreatment solution mass percent is 7% hydrochloric acid, 6% Al 3+ and 2% sulfuric acid;

[0049] Place the aluminum foil soaked in the pretreatment solution in the vacuum chamber of the coating machine for nano-titanium plating treatment, specifically: adjust the vacuum degree of the vacuum chamber of the coating machine to 5.0×10 -3 Pa, the temperature is 200°C, and the holding time is 20min; Ar is passed into the vacuum chamber of the coating machine to keep the pressure at 0.1Pa; then the bias power is turned on, the bias voltage is adjusted to 250V, and the discharge cleaning is 20min; adju...

Embodiment 2

[0057] A method for preparing an electrode foil for an aluminum electrolytic capacitor, comprising the following steps:

[0058] Place aluminum foil with a purity of 99.99% and a thickness of 120 μm in a pretreatment solution at a temperature of 75° C. Said pretreatment solution mass percent is 12% hydrochloric acid, 9% Al 3+ and 6% sulfuric acid;

[0059] Place the aluminum foil soaked in the pretreatment solution in the vacuum chamber of the coating machine for nano-titanium plating treatment, specifically: adjust the vacuum degree of the vacuum chamber of the coating machine to 5.0×10 -3 Pa, the temperature is ~250°C, and the holding time is 30 minutes; Ar is passed into the vacuum chamber of the coating machine to keep the pressure at 0.4Pa; then the bias power supply is turned on, the bias voltage is adjusted to 250V~280V, and the discharge cleaning is 20min~30min ;Adjust the bias voltage from 120V to 170V, turn on the ion source for ion cleaning for 30 minutes, and tur...

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Abstract

The invention provides a preparation method of an electrode foil for an aluminum electrolytic capacitor. The preparation method comprises the following steps: soaking an aluminum foil in a pretreatment solution, plating nano titanium, soaking in a first mixed treatment solution, soaking in a second mixed treatment solution and soaking in a third mixed treatment solution. The preparation method of the electrode foil for the aluminum electrolytic capacitor is simple, hydrochloric acid, sulfuric acid and nitric acid can be effectively recycled, and in the pretreatment waste liquid and the first mixed treatment waste liquid, the recovery rate of hydrochloric acid and sulfuric acid reaches 85%, and the retention rate of Al<3+> reaches 95%; in the second mixed treatment waste liquid and the third mixed treatment waste liquid, the recovery rate of nitric acid reaches 80%, and the retention rate of Al<3+> reaches 95%; and besides, current does not need to be applied during soaking in the second mixed treatment liquid and soaking in the third mixed treatment liquid, the advantages of energy conservation and emission reduction are achieved, and the prepared electrode foil has better hole forming uniformity and bending performance.

Description

technical field [0001] The invention relates to a method for preparing an electrode foil for a capacitor, in particular to a method for preparing an electrode foil for an aluminum electrolytic capacitor. Background technique [0002] Aluminum electrolytic capacitors are developing towards miniaturization and miniaturization, and the requirements for specific volume and bending performance of electrode foils for aluminum electrolytic capacitors are constantly increasing to meet the manufacturing needs of cutting smaller widths and winding smaller diameters. The key to obtaining high specific capacitance is to form uniformly distributed high-density tunnel pores with reasonable pore size and pore length on the surface of the electrode foil. The electrode foil is obtained by etching aluminum metal foil, for example. Thereby, the surface area of ​​the electrode foil can be increased, and the capacitance can be improved. At present, a large amount of waste acid, such as hydroch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/16C23C14/28C23C14/02C23C14/58C23G1/06C23G1/04C23G1/12
CPCC23C14/16C23C14/28C23C14/021C23C14/58C23G1/068C23G1/04C23G1/125
Inventor 谢悦江露莹李健华伍婉莹冯智源包艳萍杨富国张玉红
Owner FOSHAN UNIVERSITY
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