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Variable frequency corrosion method of low-voltage anode foil for electrolytic capacitor

A low-voltage anode foil and electrolytic capacitor technology, applied in the direction of electrolytic capacitors, capacitors, circuits, etc., can solve the problems of the limit value of specific volume of aluminum foil, the inability to achieve corrosion morphology, and the failure of power frequency to adapt to the initial state, etc., and achieve good contact resistance , less weight loss and high mechanical strength

Active Publication Date: 2009-07-08
GUANGDONG HUAFENG NEW ENERGY TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the different corrosion states of the low-voltage anode foil for electrolytic capacitors at each stage during the corrosion process, the existing fixed power supply frequency cannot adapt to the initial state of corrosion at each stage, resulting in the failure of the low-voltage anode foil for electrolytic capacitors to achieve an ideal corrosion morphology. Therefore, there is a limit value for the specific volume of aluminum foil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] (1) Place the low-voltage anode foil of the electrolytic capacitor in a 0.4wt% phosphoric acid solution, and act for 0.5 minutes at a temperature of 45°C;

[0052] (2) The foil treated in step (1) is subjected to spot corrosion in 8wt% hydrochloric acid and 0.1wt% sulfuric acid solution at a temperature of 25°C and a current density of 0.2A / cm 2 , the action time is 15 seconds, the frequency is 45Hz;

[0053] (3) The foil treated in step (2) was treated in 8wt% hydrochloric acid and 0.1wt% sulfuric acid; the applied current density was 0.1A / cm 2 , at 45Hz AC frequency, act at 45°C for 100 seconds, then switch to 30Hz, act at 37°C for 100 seconds, finally switch to 5Hz, act at 10°C for 100 seconds;

[0054] (4) After rinsing with pure water, place the aluminum foil in 0.2wt% nitric acid aqueous solution at a temperature of 45° C. for 3 minutes and place it at 400-460° C. for 4 minutes.

Embodiment 2

[0056] (1) Place the low-voltage anode foil of the electrolytic capacitor in a 0.5wt% phosphoric acid solution, and act at a temperature of 50°C for 1.0 minute;

[0057] (2) The foil treated in step (1) is subjected to spot corrosion in 9wt% hydrochloric acid and 0.5wt% sulfuric acid solution at a temperature of 30°C and a current density of 0.6A / cm 2 , the action time is 20 seconds, the frequency is 35Hz;

[0058] (3) The foil treated in step (2) is deeply etched in 9wt% hydrochloric acid and 0.5wt% sulfuric acid, and the applied current density is 0.15A / cm 2 , at an AC frequency of 30Hz, act at a temperature of 40°C for 110 seconds, then switch to 25Hz, act at a temperature of 35°C for 110 seconds, and finally convert to 6Hz, act at a temperature of 15°C for 110 seconds;

[0059] (4) After rinsing with pure water, place the aluminum foil in 0.8wt% nitric acid aqueous solution at a temperature of 20° C. for 4 minutes; place it at 400-460° C. for 2 minutes.

Embodiment 3

[0061] (1) Place the low-voltage anode foil of the electrolytic capacitor in a 2.5wt% phosphoric acid solution, and act for 2 minutes at a temperature of 60°C;

[0062] (2) The foil treated in step (1) is subjected to spot corrosion in 10wt% hydrochloric acid and 0.6wt% sulfuric acid solution at a temperature of 40°C and a current density of 0.5A / cm 2 , the action time is 45 seconds, and the frequency is 35Hz;

[0063] (3) The foil treated in step (2) is deeply etched in 10wt% hydrochloric acid and 0.6wt% sulfuric acid, and the applied current density is 0.25A / cm 2 , at 23Hz AC frequency, act at a temperature of 35°C for 120 seconds, then switch to 14Hz, act at a temperature of 29°C for 120 seconds, finally convert to 10Hz, act at a temperature of 23°C for 120;

[0064] (4) After rinsing with pure water, put the aluminum foil in 2.0wt% nitric acid aqueous solution at a temperature of 35° C. for 4 minutes; place it at 400-460° C. for 2 minutes.

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Abstract

The invention relates to a frequency conversion corrosion method for low-voltage anode foil of an electrolytic capacitor, which comprises (1) using 0.4-4.5 wt% phosphoric acid solution to corrode the low-voltage anode foil of an electrolytic capacitor at a temperature of 45-85°C for 0.5-3 minutes; (2) The anode foil obtained in step (1) is treated with 8-12wt% hydrochloric acid and 0.1-1.0wt% sulfuric acid at a temperature of 5-50°C and a current density of 0.2-0.8A / cm2 for 15-75 seconds; (3) The anode foil obtained in step (2) is subjected to deep corrosion in the corrosive solution, the current density is 0.1-0.5A / cm2, the temperature is 10-45°C, and the power frequency of 45-5Hz according to the sine wave changes from high to low; (4) Cleaning, post-processing, and annealing; obtain capacitor anode foil with less weight loss, high specific volume, good mechanical strength, small contact resistance, and small dispersion.

Description

technical field [0001] The invention relates to an electrochemical corrosion method for low-voltage anode foils for electrolytic capacitors, in particular to a frequency conversion corrosion method for low-voltage anode foils for electrolytic capacitors. An ideal corrosion foil is obtained by applying a special electrical form and matching other corrosion conditions. Background technique [0002] The corrosion technology of low-voltage anode foil is to use AC power source corrosion, which has the advantages of simple equipment, no need for mechanical contact to conduct electricity, high specific volume and good mechanical properties of the corrosion foil. [0003] The existing frequency conversion corrosion method of low-voltage anode foil of electrolytic capacitor mainly includes the following steps: [0004] (1) Pretreatment; [0005] (2) Spot corrosion and cleaning; [0006] (3) Deep corrosion; [0007] (4) Cleaning, post-processing, and annealing. [0008] The AC cor...

Claims

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Application Information

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IPC IPC(8): H01G9/055C23F1/16C23F4/00
Inventor 邱辉荣孙岚谭惠忠程雪岩
Owner GUANGDONG HUAFENG NEW ENERGY TECH CO LTD
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