Production of electrolytic capacitor anode aluminum foil

A technology for electrolytic capacitors and manufacturing methods, applied in electrolytic capacitors, capacitor manufacturing, capacitors, etc., can solve the problems of long boosting time, obvious deviation, large loss, etc., and achieve good hydration resistance, short boosting time, and low loss. Effect

Inactive Publication Date: 2007-09-05
DONGGUAN HEC CONDENSER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The specific volume of the anodized film obtained in this way is relatively high, the deviation is relatively obvious, and the loss is also large. The loss varies between 0.025% and 0.05% under different specific volumes. At the same time, the boosting time is long, and the water resistance is difficult to control. These Insufficient so that the anode foil thus produced is difficult to meet the needs of capacitors for AC motors
Due to the large current when starting the AC motor, if the loss is large and the heat is severe, it will cause damage to the capacitor; in addition, if the hydration resistance of the anode foil is not good, the aluminum in the anode will interact with the electrolyte in the case of high temperature. The water reacts to generate hydrogen gas, which makes the capacitor bulge, resulting in the danger of explosion and unnecessary losses

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Corrosion foil in 20g / L oxalic acid solution at room temperature with a current density of 20mA.cm -2 Carry out chemical formation, the time is 30min, the temperature of the solution is controlled at about 30°C; take it out and wash it with hot water, in the aqueous solution of 20g / L boric acid and 10g / L borax, at 45°C, the current density is 20mA.cm -2 1. Carry out the first stage formation under the condition of 100V voltage, the constant voltage time is 8 minutes; carry out the second stage formation under the same condition in the same electrolyte, the voltage rises to 200V, and the constant voltage is 8 minutes; in the same electrolyte solution with Carry out the third-stage formation under the same conditions, the voltage is raised to 280V, and the constant voltage is 12 minutes; the fourth-stage formation is carried out under the same conditions in the same electrolyte, the voltage is raised to 335V, and the constant voltage is 24 minutes; then the foil is heated ...

Embodiment 2

[0016] Corrosion foil in 50g / L oxalic acid solution at room temperature with a current density of 25mA.cm -2 Carry out chemical formation, the time is 24min, the temperature of the solution is controlled at about 25°C; take it out and wash it with hot water, in the aqueous solution of 40g / L boric acid and 10g / L borax, at 55°C, the current density is 20mA.cm -2 1. Under the condition of 140V, the first-stage formation is carried out, and the constant voltage time is 8 minutes; in the same electrolyte, the formation is carried out under the same conditions, and the voltage is raised to 280V, and the constant voltage is 8 minutes; in 40g / L boric acid and 5g / L In the aqueous solution of L borax, carry out the third-stage formation, the voltage is increased to 420V, and the constant voltage is 12 minutes; in the aqueous solution of 40g / L boric acid and 3g / L borax, the fourth-stage formation is carried out, the voltage is increased to 470V, and the constant voltage is 24 minutes ;Th...

Embodiment 3

[0019] Corrosion foil in 60g / L oxalic acid solution at room temperature with a current density of 10mA.cm -2 Carry out chemical formation, the time is 60min, the temperature of the solution is controlled at about 25°C; take it out and wash it with hot water, and perform the first stage of chemical formation in an aqueous solution of 50g / L boric acid and 10g / L borax, at 65°C and a current density of 20mA.cm -2 , The voltage is 150V, the constant voltage time is 8 minutes; the second-stage chemical formation is carried out in the aqueous solution of 50g / L boric acid and 6g / L borax, the voltage is raised to 300V, and the constant voltage is 8 minutes; at 50g / L Carry out the third-stage formation in the aqueous solution of boric acid and 2.5g / L borax, the voltage is raised to 470V, and keep the constant voltage for 14 minutes; carry out the fourth-stage formation in the aqueous solution of 50g / L boric acid and 1.0g / L borax, and the voltage is raised to 520V, constant voltage for 2...

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PUM

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Abstract

The invention is concerned with the manufacture method for the anodic foil of the electrolytic capacitor, which is the manufacture method by using motor, it is: cleans the corrosive foil with pure water - oxalic acid forming - cleans with hot water - conducts forming in four stages - heat treatment - re-forming - treats with the phosphoric acid - re-forming - heat treatment - re-forming - drying. The advantages of the invention are low wastage, better flexibility, shorter voltage boosting, and better hydration proof.

Description

technical field [0001] The invention belongs to a method for manufacturing an anode foil of an electrolytic capacitor. Background technique [0002] The preparation method of the anode foil of the conventional aluminum electrolytic capacitor generally includes pure water boiling, chemical formation, heat treatment, depolarization, phosphoric acid treatment, and further chemical formation treatment. The chemical conversion treatment is generally first boiled in high-temperature (greater than 95°C) pure water for a period of time, so that the corroded foil first forms a layer of hydration film, and in high-temperature (greater than 85°C) inorganic acids (such as boric acid, phosphoric acid) or organic acids (such as acetonitrile) Diacid) for anodic oxidation, so that the hydrated film on the surface of the corroded foil can produce a layer of crystalline alumina with a dense structure and good insulating properties as the anode of the capacitor. The specific volume of the ano...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/055H01G13/00C25D11/16C25D11/04C25D11/12C25D11/08C25D11/10
Inventor 何凤荣
Owner DONGGUAN HEC CONDENSER CO LTD
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