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.
CN109750346AInactive Publication Date: 2019-05-14CENT SOUTH UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CENT SOUTH UNIV
Publication Date
2019-05-14
Estimated Expiration
Not applicable · inactive patent

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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.
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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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