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Pretreatment method for preparing medium-high pressure corrosion foil and application of pretreatment method

A medium and high voltage corrosion foil and pretreatment technology, which is applied to capacitors, circuits, electrical components, etc., can solve the problems of uneven distribution of surface corrosion pits and inconsistent lengths of tunnel holes, etc., to improve specific volume and bending performance, and improve Comprehensive performance, the effect of uniform pores

Active Publication Date: 2022-07-01
RUYUAN YAO AUTONOMOUS COUNTY DONGYANGGUANG FORMED FOIL CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a medium and high pressure corroded foil pretreatment process, which uses phosphoric acid, nitric acid, and tartaric acid as the pretreatment liquid and combines the pre-distribution process, which can improve the surface corrosion hole distribution in the subsequent corrosion process. It can solve the problems of uneven surface and parallel holes, color difference and inconsistent length of tunnel holes, and can effectively improve the specific volume and bending performance of the corroded foil

Method used

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  • Pretreatment method for preparing medium-high pressure corrosion foil and application of pretreatment method
  • Pretreatment method for preparing medium-high pressure corrosion foil and application of pretreatment method
  • Pretreatment method for preparing medium-high pressure corrosion foil and application of pretreatment method

Examples

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Embodiment 1

[0052] A pretreatment method for preparing medium and high pressure etched foil, comprising the following steps:

[0053] S11. Pretreatment: put the aluminum foil into a pretreatment solution containing 50% phosphoric acid, 30% nitric acid, and 10% tartaric acid, and treat at 50°C for 180s;

[0054] S12. Pre-distribution of holes: put the aluminum foil pretreated in step S11. in a mixture of 10% hydrochloric acid and 0.3% sulfuric acid solution at 45°C for electrification treatment, and the current density is 0.35A / cm 2 , the power-on time is 50s, the frequency is 50Hz, the waveform is a sine wave, and then the water is washed at room temperature.

Embodiment 2

[0056] A pretreatment method for preparing medium and high pressure etched foil, comprising the following steps:

[0057] S11. Pretreatment: put the aluminum foil into a pretreatment solution with a mass fraction of phosphoric acid 60%, nitric acid 20%, and tartaric acid 5%, and treat at 30°C for 300s;

[0058] S12. Pre-distribution of holes: put the aluminum foil pretreated in step S11. in a mixture of 5% hydrochloric acid and 0.1% sulfuric acid solution at 25°C for electrification treatment, and the current density is 0.2A / cm 2 , the power-on time is 30s, the frequency is 30Hz, the waveform is a triangular wave, and then the water is washed at room temperature.

Embodiment 3

[0060] A pretreatment method for preparing medium and high pressure etched foil, comprising the following steps:

[0061] S11. Pretreatment: put the aluminum foil into a pretreatment solution containing 40% phosphoric acid, 35% nitric acid, and 20% tartaric acid, and treat at 50°C for 180s;

[0062] S12. Pre-arrangement of holes: put the aluminum foil pretreated in step S11. in a mixture of 15% hydrochloric acid and 0.5% sulfuric acid solution at 50°C for electrification treatment, and the current density is 0.5A / cm 2 , the power-on time is 60s, the frequency is 60Hz, the waveform is a rectangular wave, and then the water is washed at room temperature.

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Abstract

The invention provides a pretreatment method for preparing a medium-high voltage corrosion foil and application thereof. According to the pretreatment method, phosphoric acid, nitric acid and tartaric acid are mixed to serve as pretreatment liquid, and a hole pre-distribution process is combined for treatment; the pretreatment liquid comprises the following components in percentage by mass: 40-60% of phosphoric acid, 20-35% of nitric acid and 5-20% of tartaric acid. According to the pretreatment method, starting hole defect sites which are uniformly distributed are formed on the surface of the aluminum foil, and the problems that etched holes in the subsequent electrocorrosion surface are not uniformly distributed and combined, chromatic aberration occurs, and the lengths of tunnel holes are inconsistent are solved. The etched foil prepared by adopting the process has the advantages of uniform surface hole forming, fewer parallel holes, no color difference, consistent tunnel hole length, high specific volume and good bending performance.

Description

technical field [0001] The invention belongs to the technical field of corrosion foil pretreatment, in particular to a pretreatment method for preparing medium and high pressure corrosion foil and its application. Background technique [0002] Medium and high voltage etched foil is the key raw material for the manufacture of aluminum electrolytic capacitors. Among them, the uniformity of surface etched hole distribution and the consistency of tunnel hole length are the keys to obtain high-performance medium and high pressure etched foils. The raw materials of aluminum electrolytic capacitor corrosion foil will inevitably adhere to impurities such as oil stains during the manufacturing process. The high temperature homogenization and annealing process to increase the crystal plane occupancy will also form an oxide film on the surface of the aluminum foil, thereby making the surface state of the aluminum foil uneven. . The above factors will directly affect the porosity dist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25F3/04H01G9/045H01G9/055
CPCC25F3/04H01G9/045H01G9/055Y02E60/10
Inventor 闫小宇赵龙谢文娟何凤荣陈锦雄
Owner RUYUAN YAO AUTONOMOUS COUNTY DONGYANGGUANG FORMED FOIL CO LTD
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