Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Forming process of anode foils for extra-high voltage aluminium electrolytic capacitors

An aluminum electrolytic capacitor, anode foil technology, applied in electrolytic capacitors, capacitors, anodizing and other directions, can solve the problem that the technology can not meet the requirements, and achieve the effect of good mechanical strength and hydration resistance, high electrostatic capacity and good compactness

Inactive Publication Date: 2010-07-14
YANGZHOU HONGYUAN ELECTRONICS
View PDF5 Cites 28 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many reports on the domestic research on the formation process, but the production of anode foil for UHV aluminum electrolytic capacitors by the existing method is still technically unable to meet the requirements

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A process for forming an anode foil for an ultra-high voltage aluminum electrolytic capacitor, the process sequentially includes the following steps:

[0045] (1) Pretreatment

[0046] Put the electrolytically etched aluminum foil in pure water at a temperature of 90°C and soak for 20 minutes.

[0047] (2) The first level of formation

[0048] Put the pretreated foil in an aqueous solution containing 1wt% boric acid and 0.01wt% ammonium adipate at 50°C to form an oxide film, and the formation current density is 0.01A / cm 2 , time 50 minutes.

[0049] (3) Phosphoric acid treatment 1

[0050] The foil after the first-stage chemical formation was placed in an aqueous phosphoric acid solution with a temperature of 40° C. and a concentration of 1 wt % for 15 minutes.

[0051] (4) High temperature treatment 1

[0052] The foil after phosphoric acid treatment 1 was placed in an oven at 350°C for 5 minutes.

[0053] (5) The second level of formation

[0054]Put the foil a...

Embodiment 2

[0067] A process for forming an anode foil for an ultra-high voltage aluminum electrolytic capacitor, the process sequentially includes the following steps:

[0068] (1) Pretreatment

[0069] Put the electrolytically etched aluminum foil in pure water at a temperature of 100° C. and soak for 5 minutes.

[0070] (2) The first level of formation

[0071] Put the pretreated foil at 90°C in an aqueous solution containing 9wt% boric acid and 0.6wt% ammonium adipate to form an oxide film, and the formation current density is 0.6A / cm 2 , time 20 minutes.

[0072] (3) Phosphoric acid treatment 1

[0073] The foil after the first-stage chemical formation was placed in an aqueous phosphoric acid solution with a temperature of 80° C. and a concentration of 10 wt % for 3 minutes.

[0074] (4) High temperature treatment 1

[0075] The foil after phosphoric acid treatment 1 was placed in an oven at 600°C for 1 minute.

[0076] (5) The second level of formation

[0077] Put the foil a...

Embodiment 3

[0090] A process for forming an anode foil for an ultra-high voltage aluminum electrolytic capacitor, the process sequentially includes the following steps:

[0091] (1) Pretreatment

[0092] Put the electrolytically etched aluminum foil in pure water at a temperature of 95° C. and soak for 10 minutes.

[0093] (2) The first level of formation

[0094] Put the pretreated foil in an aqueous solution containing 5wt% boric acid and 0.3wt% ammonium adipate at 70°C to form an oxide film, and the formation current density is 0.3A / cm 2 , time 40 minutes.

[0095] (3) Phosphoric acid treatment 1

[0096] The foil after the first-stage chemical formation was placed in an aqueous phosphoric acid solution with a temperature of 70° C. and a concentration of 5 wt % for 10 minutes.

[0097] (4) High temperature treatment 1

[0098] The foil after phosphoric acid treatment 1 was placed in an oven at 550°C for 4 minutes.

[0099] (5) The second level of formation

[0100] Put the foil ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a forming process of anode foils for extra-high voltage aluminium electrolytic capacitors, comprising the following steps: placing aluminium foils which undergo electrolytic corrosion in pure water at 90 DEG C or above to carry out pretreatment; then carrying out first-stage formation on the pretreated aluminium foils in aqueous solution containing 1-9wt% of boric acid and 0.01-0.6wt% of ammonium adipate; then treating the foils which undergo first-stage formation with phosphoric acid solution at the concentration of 1-10wt%; then treating the foils which undergo phosphoric acid treatment at high temperature; then carrying out second-stage formation on the foils which undergo high temperature treatment in the aqueous solution containing 2-10wt% of boric acid and 0.01-0.09wt% of ammonium pentaborate; then treating the foils which undergo second-stage formation in the phosphoric acid solution at the concentration of 1-10wt%; then treating the foils which undergo phosphoric acid treatment at high temperature; finally carrying out third-stage formation on the foils which undergo high temperature treatment in the mixed aqueous solution containing 2-10wt% of boric acid and 0.01-0.09wt% of ammonium pentaborate and carrying out post-treatment on the foils which undergo third-stage formation in the aqueous solution containing 1-13wt% of phosphoric acid and 0.1-6wt% of ammonia, and cleaning and then drying the foils which undergo post-treatment.

Description

technical field [0001] The invention relates to a processing technology of an anode foil, in particular to a chemical formation process of an anode foil for an ultra-high voltage aluminum electrolytic capacitor. Background technique [0002] Anode foils for electrolytic capacitors generally use boric acid, phosphoric acid, adipic acid, azelaic acid, citric acid, etc., or salts of these acids, at least one of which is used as an electrolyte, and is electrochemically oxidized on the surface of the corroded foil. Oxide film (γ-Al 2 o 3 ) as a dielectric, made into a foil, and the formation process of the oxide film is called chemical formation. There are many domestic reports on the research on the formation process, but the production of anode foil for UHV aluminum electrolytic capacitors by the existing method still cannot meet the technical requirements. Contents of the invention [0003] The object of the present invention is to provide a process for the formation of a...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H01G9/045H01G9/055C25D11/12C25D11/08C25D11/16C25D11/18C25D11/24
Inventor 马坤松王磊
Owner YANGZHOU HONGYUAN ELECTRONICS
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com