Formation technique of medium/high-voltage anode aluminum foil for enhancing aluminum electrolytic capacitance

A technology of aluminum electrolytic capacitors and anode aluminum foils, applied in electrolytic coatings, surface reaction electrolytic coatings, coatings, etc., can solve problems such as long boosting time, long TR60, and small capacity of anode aluminum foils

Active Publication Date: 2013-08-14
YIDU DONGYANGGUANG FORMED FOIL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The anode aluminum foil for aluminum electrolytic capacitors made by this process has small capacity, long boost time and long TR60

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Take the 99.99% aluminum foil after electrolytic corrosion treatment and soak it in pure water at 97°C for 12 minutes;

[0012] Primary formation: In the primary stage, the concentration of phytic acid is 0.6ml / L, the concentration of citrate is 0.9g / L, the temperature of the bath solution is 85°C, the formation voltage is 120V, and the current density is 60mA / cm 2 , the formation time is 5 minutes;

[0013] Secondary formation: In the second stage, the concentration of phytic acid is 0.5ml / L, the concentration of citrate is 0.6g / L, the temperature of the bath is 85°C, the formation voltage is 320V, and the current density is 60mA / cm 2 , the formation time is 5 minutes;

[0014] Tertiary formation: in the third stage, the concentration of phytic acid is 0.5ml / L, the concentration of citrate is 0.5g / L, the temperature of the bath is 85°C, the formation voltage is 450V, and the current density is 60mA / cm 2 , the formation time is 8 minutes;

[0015] Four-stage formatio...

Embodiment 2

[0026] Take the 99.99% aluminum foil after electrolytic corrosion treatment and immerse it in pure water at 97°C for 15 minutes;

[0027] Primary formation: Phytic acid concentration is 1.8ml / L, citrate concentration is 3.0g / L, bath temperature is 90°C, formation voltage is 120V, current density is 90mA / cm 2 , the formation time is 5 minutes;

[0028] Secondary formation: the concentration of phytic acid is 1.0ml / L, the concentration of citrate is 2.5g / L, the temperature of the bath solution is 90°C, the formation voltage is 320V, and the current density is 90mA / cm 2 , the formation time is 5 minutes;

[0029] Tertiary formation: Phytic acid concentration is 1.5ml / L, citrate concentration is 2.0g / L, bath temperature is 90°C, formation voltage is 450V, current density is 90mA / cm 2 , the formation time is 8 minutes;

[0030] Four-stage formation: Phytic acid concentration is 1.0ml / L, citrate concentration is 1.5g / L, boric acid concentration is 20g / L, bath temperature is 90°C,...

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PUM

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Abstract

The invention relates to the technical field of medium/high-voltage formation of anode foils, particularly a six-stage formation technique for enhancing capacity of an anode foil for an aluminum electrolytic capacitor and lowering the boosting time Tr and Tr60 by medium/high voltage. The technique is characterized by comprising the following steps: treating an aluminum foil subjected to electrolytic corrosion treatment in 50-100 DEG C pure water, and forming with phytic acid and citrate solution in the primary, secondary and tertiary stages; forming in phytic acid, boric acid and citrate solution in the quaternary, quinary and senary stages; and depolarizing by heat treatment and phosphate treatment. The boosting time Tr is at least lowered by 23%, the boosting time Tr60 is at least lowered by 66%, and the specific capacity effect of the aluminum foil is enhanced by 10-20%.

Description

technical field [0001] The invention relates to the technical field of medium and high voltage anode aluminum foil formation, and is particularly suitable for the medium and high voltage six-stage formation process of anode aluminum foil for "aluminum electrolytic capacitors". Background technique [0002] The anode aluminum foil for high-voltage aluminum electrolytic capacitors is manufactured through a series of chemical formation processes such as electrochemical anodization of high-purity aluminum foil after corroding and expanding the surface. Before that, the formation process of anode aluminum foil for high-voltage aluminum electrolytic capacitors is: first Soak the high-purity aluminum foil after corroding and expanding the surface in deionized water at 92-100°C for 20-30 minutes, and then perform 100-240V primary chemical conversion treatment, and place the aluminum foil in boric acid with a concentration of 1-10% and 0.1- In an aqueous solution of 1% ammonium penta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/12
Inventor 邓本委李宝良蒋海波
Owner YIDU DONGYANGGUANG FORMED FOIL
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