Corrosion pretreatment method for zinc or tin crystal nuclei deposited on anodic oxidation of medium and high voltage electronic aluminum foil

An anodic oxidation and electronic aluminum foil technology, applied in the direction of electrolytic coating, surface reaction electrolytic coating, coating, etc., can solve the problems of unseen large-scale industrial production, complicated and cumbersome process, and many control factors, and achieve the purpose of inhibiting corrosion and thinning , uniform distribution of corrosion pits, and the effect of reducing the probability of merging holes

Active Publication Date: 2016-01-20
新疆广投桂东电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the complex and cumbersome process and many control factors, this technology is still in the laboratory research stage, and there are no reports of mass industrial production.

Method used

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  • Corrosion pretreatment method for zinc or tin crystal nuclei deposited on anodic oxidation of medium and high voltage electronic aluminum foil
  • Corrosion pretreatment method for zinc or tin crystal nuclei deposited on anodic oxidation of medium and high voltage electronic aluminum foil

Examples

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Effect test

Embodiment 1

[0023] Put the aluminum foil in 20% H 2 SO 4 solution, the applied current density is 5mAcm -2 Anode current was anodized for 30s, and then the aluminum foil was immersed in a mixed solution of 5% NaOH and 0.05% ZnO at a temperature of 40°C for 30s, and then the same pitting corrosion, hole expansion corrosion, and After treatment and 520V chemical conversion treatment.

Embodiment 2

[0025] Put the aluminum foil in 20% H 2 SO 4 solution, the applied current density is 10mAcm -2 Anode current was anodized for 30s, and then the aluminum foil was immersed in a mixed solution of 5% NaOH and 0.05% ZnO at a temperature of 40°C for 30s, and then the same pitting corrosion, hole expansion corrosion, and After treatment and 520V chemical conversion treatment.

Embodiment 3

[0027] Put the aluminum foil in 20% H 2 SO 4 solution, the applied current density is 10mAcm -2 Anodic current was anodized for 10s, and then the aluminum foil was immersed in a mixed solution of 5% NaOH and 0.1% ZnO at a temperature of 40°C for 30s, and then the same pitting corrosion, hole expansion corrosion, and After treatment and 520V chemical conversion treatment.

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Abstract

The invention discloses a corrosion pretreatment method for anode oxidation deposited zinc / tin crystal nucleus of a middle-high voltage electronic aluminum foil. The corrosion pretreatment method comprises the following steps of: carrying out anodic oxidation treatment on the middle-high voltage electronic aluminum foil in sulfuric acid, phosphoric acid, chromic acid or oxalic acid, so as to generate an oxidation film with micropores; then soaking the middle-high voltage electronic aluminum foil which is subjected to the anodic oxidation treatment in an alkali solution dissolved with ZnO or SnO, so as to corrode and thin the porous aluminum oxide film to expose active aluminum at the bottom of the micropores, and carrying out replacement reaction between the active aluminum and a zinc acid radical or a tin acid radical, so as to generate the zinc crystal nucleus or the tin crystal nucleus. In the process that the aluminum foil is corroded, the zinc crystal nucleus or the tin crystal nucleus can guide the aluminum foil to generate micropores, and the possibility that the micropores are combined is reduced; the aluminum foil can be prevented from being corroded and thinned because of an Al2O3 film, and the specific capacitance and the fracture resistance of the middle-high voltage electronic aluminum foil are improved.

Description

technical field [0001] The invention relates to the technical field of anode foil corrosion for aluminum electrolytic capacitors, in particular to a corrosion pretreatment method for anodic oxidation deposition of zinc or tin crystal nuclei on medium and high voltage electronic aluminum foils. Background technique [0002] In order to adapt to the continuous shrinking of the volume of electronic machines and the development of high-density assembly, miniaturization is an inevitable trend in the development of aluminum electrolytic capacitors. By electrolytic etching of high-purity aluminum foil with {100} texture to expand its specific surface area and improve Specific capacitance is the most effective technical way to miniaturize aluminum electrolytic capacitors. [0003] At present, the electrolytic corrosion process of medium and high pressure aluminum foil generally includes pretreatment, hole corrosion, hole expansion corrosion, and posttreatment. The key to obtaining ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25F3/04C25D11/24
Inventor 梁力勃何业东宋洪洲杨小飞蔡小宇熊传勇
Owner 新疆广投桂东电子科技有限公司
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