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Manufacturing process for middle-high-voltage etched foil

A medium and high voltage corroded foil and manufacturing process technology, which is applied in capacitor manufacturing, electrical components, circuits, etc., can solve the problems of corroded foil's easy deformation, surface color difference, etc., and achieve ideal effect, convenient operation and improved bending performance.

Inactive Publication Date: 2019-05-14
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Forming evenly distributed tunnel holes with high density and reasonable size (aperture and pore length) on the surface of high-voltage aluminum foil is the key to obtaining high specific capacitance. The existing pretreatment process for corroded foil is basically sulfuric acid hydrochloric acid, phosphoric acid and sodium hydroxide. , the pretreatment temperature of sulfuric acid, hydrochloric acid and phosphoric acid is basically around 65-75°C, the corroded foil is easy to deform at high temperature, and there will be color difference on the surface after porosity treatment; although the alkali treatment temperature is low, the surface of the foil is easy to be damaged during the alkali treatment process. Those trace elements that are beneficial to the pores are also disposed of

Method used

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  • Manufacturing process for middle-high-voltage etched foil
  • Manufacturing process for middle-high-voltage etched foil

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Embodiment 1

[0017] In the embodiment of the present invention, a manufacturing process of medium and high pressure corrosion foil includes five steps of pretreatment, primary pore corrosion, secondary pore corrosion, tertiary expansion corrosion and post-treatment on high-purity aluminum foil. The pre-treatment is to put the aluminum foil in the pre-treatment solution and soak for 40s; after that, it is cleaned and placed in the primary corrosion mixture at a temperature of 80℃, and a direct current with a current density of 0.8A / cm2 is applied for electrolytic corrosion for 50s. Clean the pure water and put it into a bath containing 2% nitric acid at a temperature of 70°C, and apply a direct current with a current density of 0.15A / cm2 for electrolytic corrosion for 500s; finally, clean the pure water and put it in a bath with a temperature of 200°C Drying in an oven is sufficient. The post-treatment is to enter the corroded foil that has completed the third-stage expansion corrosion into t...

Embodiment 2

[0025] In the embodiment of the present invention, a manufacturing process of medium and high pressure corrosion foil includes five steps of pretreatment, primary pore corrosion, secondary pore corrosion, tertiary expansion corrosion and post-treatment on high-purity aluminum foil. The pre-treatment is to immerse the aluminum foil in the pre-treatment solution for 45s; then clean it and place it in the primary corrosion mixture at a temperature of 85°C, apply a direct current with a current density of 0.8A / cm2 for electrolytic corrosion for 55s. Clean the pure water and put it into a bath containing 2% nitric acid at a temperature of 75°C, and apply a direct current with a current density of 0.15A / cm2 to perform electrolytic corrosion for 550s; finally, clean the pure water and put it in a temperature of 210°C Drying in an oven is sufficient. The post-treatment is to enter the corroded foil that has completed the third-stage expansion corrosion into the heating stage, the starti...

Embodiment 3

[0033] In the embodiment of the present invention, a manufacturing process of medium and high pressure corrosion foil includes five steps of pretreatment, primary pore corrosion, secondary pore corrosion, tertiary expansion corrosion and post-treatment on high-purity aluminum foil. The pre-treatment is to immerse the aluminum foil in the pre-treatment solution for 50s; then clean it and place it in the primary corrosion mixture at a temperature of 90℃, apply a direct current with a current density of 0.8A / cm2 for electrolytic corrosion for 60s. Clean the pure water and put it in a bath containing 2% nitric acid at a temperature of 80℃, and apply a direct current with a current density of 0.15A / cm2 for electrolytic corrosion for 600s; finally, clean the pure water and put it in a temperature of 220℃ Drying in an oven is sufficient. The post-treatment is to enter the corroded foil that has completed the third-stage expansion corrosion into the heating stage, the starting temperatu...

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Abstract

The invention discloses a manufacturing process for middle-high-voltage etched foil, and relates to the technical field of production of etched foil. In order to solve the problem that etched foil isprone to deforming in the prior art, the manufacturing process comprises the steps of pretreatment, primary foaming corrosion, secondary foaming corrosion, third hole expansion corrosion and aftertreatment for high-purity aluminum foil; in the pretreatment, the aluminum plain foil is put into pretreatment liquid to be soaked for 40-50 seconds; then the aluminum plain foil is washed and then put into primary corrosion mixing liquid with the temperature of 80-90 DEG C, the foil is washed with pure water to be put into 2% of nitric acid liquid with the temperature of 70-80 DEG C, and direct current with the current density of 0.15 A / cm2 is applied for electrolytic corrosion for 500-600 seconds; and the aftertreatment adopts two-stage annealing heat treatment of different temperatures. The pretreatment process is simple, operation is convenient, deformation is avoided, the annealing process is improved in the aftertreatment, the two-stage annealing heat treatment of different temperaturesis adopted, and the bending performance of the etched foil for an aluminum electrolytic capacitor is greatly improved.

Description

Technical field [0001] The invention relates to the technical field of corrosion foil production, in particular to a manufacturing process of medium and high pressure corrosion foil. Background technique [0002] At present, the electrolytic corrosion process of medium and high pressure aluminum foil generally includes four main steps: pretreatment, primary pore corrosion, secondary pore corrosion, and post-treatment (ie, chemical washing). The formation of uniformly distributed high-density and reasonable size (aperture, hole length) tunnel holes on the surface of high-pressure aluminum foil is the key to obtaining high specific capacitance. The existing corrosion foil pretreatment process is basically sulfuric acid, hydrochloric acid, phosphoric acid and sodium hydroxide. The pretreatment temperature of sulfuric acid, hydrochloric acid and phosphoric acid is basically about 65-75℃. The high temperature corrodes the foil easily, and the color difference appears on the surface af...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25F3/04C22F1/04C22F1/02H01G13/00
Inventor 贾明李立祥艾亮殷宝华刘宇
Owner CENT SOUTH UNIV
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