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Electrode foil corrosion method of low-contact resistance low-voltage aluminium electrolytic capacitor

A technology of aluminum electrolytic capacitors and low contact resistance, applied in electrolytic capacitors, capacitors, circuits, etc., can solve the problems of high electrode foil contact resistance, poor cleaning effect, and large amount of corrosion in the corrosion layer

Inactive Publication Date: 2018-01-16
NANTONG HAIXING ELECTRONICS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The power frequency used in the corrosion process is power frequency (50Hz). After corrosion, the thickness of the residual core layer is uneven, the corrosion amount of the corrosion layer is relatively large, and the corroded aluminum powder is not fully cleaned, resulting in a large contact resistance of the electrode foil after formation; in addition, the cleaning effect If it is not good, it will also cause residual impurity ions, which will affect the leakage current of the electrode foil and the service life of the aluminum electrolytic capacitor

Method used

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  • Electrode foil corrosion method of low-contact resistance low-voltage aluminium electrolytic capacitor
  • Electrode foil corrosion method of low-contact resistance low-voltage aluminium electrolytic capacitor
  • Electrode foil corrosion method of low-contact resistance low-voltage aluminium electrolytic capacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (a) Place the low-voltage anode foil of the electrolytic capacitor in 0.01wt% sodium hydroxide solution and soak it for 3 minutes at a temperature of 40°C;

[0024] (b) The anode foil obtained in step (a) is treated with 6wt% hydrochloric acid and 0.1wt% sulfuric acid at a temperature of 30°C and a current density of 0.3A / cm² for 20 seconds;

[0025] (c) The anode foil obtained in step (b) is treated with 6wt% hydrochloric acid and 0.1wt% sulfuric acid at a temperature of 30°C for 20 seconds;

[0026] (d) Wash the anode foil obtained in step (c) with tap water at a temperature of 40°C for 30 seconds;

[0027] (e) Repeat steps (b), (c), (d) 4 times;

[0028] (f) The anode foil obtained in step (e) is subjected to hole expansion corrosion in 6wt% hydrochloric acid, 0.1wt% sulfuric acid, 0.01wt% phosphoric acid corrosion solution, the current density is 0.1A / cm², the temperature is 30°C, and the sine wave Change the frequency of 5~35Hz from low to high for low frequency ...

Embodiment 2

[0036] (a) Place the low-voltage anode light foil of the electrolytic capacitor in 0.5wt% sodium hydroxide solution and soak at 50°C for 2 minutes;

[0037] (b) The anode foil obtained in step (a) is treated with 8wt% hydrochloric acid and 0.3wt% sulfuric acid for 40 seconds at a temperature of 40°C and a current density of 0.5A / cm²;

[0038] (c) The anode foil obtained in step (b) is treated with 8wt% hydrochloric acid and 0.3wt% sulfuric acid at a temperature of 40°C for 40 seconds;

[0039] (d) Wash the anode foil obtained in step (c) with tap water at a temperature of 45°C for 40 seconds;

[0040] (e) Repeat steps (b), (c), (d) 4 times;

[0041] (f) The anode foil obtained in step (e) is subjected to hole expansion corrosion in 8wt% hydrochloric acid, 0.3wt% sulfuric acid, 0.1wt% phosphoric acid corrosion solution, the current density is 0.3A / cm², the temperature is 35°C, according to the sine wave Change the frequency of 5~35Hz from low to high for low frequency corrosi...

Embodiment 3

[0049] (a) Place the low-voltage anode foil of the electrolytic capacitor in a 2wt% sodium hydroxide solution and soak for 1 minute at a temperature of 55°C;

[0050] (b) The anode foil obtained in step (a) is treated with 10wt% hydrochloric acid and 0.5wt% sulfuric acid at a temperature of 45°C and a current density of 0.7A / cm² for 60 seconds;

[0051] (c) The anode foil obtained in step (b) is treated with 10wt% hydrochloric acid and 0.5wt% sulfuric acid at a temperature of 45°C for 60 seconds;

[0052] (d) Wash the anode foil obtained in step (c) with tap water at a temperature of 50°C for 60 seconds;

[0053] (e) Repeat steps (b), (c), (d) 4 times;

[0054] (f) The anode foil obtained in step (e) is subjected to hole expansion corrosion in 10wt% hydrochloric acid, 0.5wt% sulfuric acid, 0.5wt% phosphoric acid corrosion solution, the current density is 0.4A / cm², the temperature is 40°C, and the sine wave Change the frequency of 5~35Hz from low to high for low frequency cor...

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Abstract

The invention discloses an electrode foil corrosion method of a low-contact resistance low-voltage aluminium electrolytic capacitor. The electrode foil corrosion method of a low-contact resistance low-voltage aluminium electrolytic capacitor includes the steps: performing pretreatment by means of immersion in sodium hydroxide solution; performing power-on corrosion for 10-85 seconds in hydrochloric acid and sulfuric acid solution; immersing in the hydrochloric acid and sulfuric acid solution for 10-85 seconds, rinsing by means of tap water, and repeating the corrosion, immersion and rinsing steps for 4 times; performing pore broadening power-on corrosion for 10-85 seconds in the hydrochloric acid, sulfuric acid and phosphoric acid corrosion liquid, immersing for 10-85 seconds in the hydrochloric acid, sulfuric acid and phosphoric acid corrosion liquid, rinsing by means of tap water, and repeating the corrosion, immersion and rinsing steps for 8 times; and immersing by means of the hydrochloric acid solution, immersing by means of nitric acid solution, rinsing by means of clean water, and then performing annealing treatment. The electrode foil corrosion method of a low-contact resistance low-voltage aluminium electrolytic capacitor utilizes multi-level pore-forming multi-level low frequency pore broadening to control the corrosion morphology, and correspondingly performs multiple steps of treatment in bath solution and warm rinse to enable the aluminium powder and foreign ion during the corrosion process to be fully rinsed to finally obtain an electrode foil for a low-contact resistor low-voltage aluminium electrolytic capacitor, wherein the electrode foil is uniform in the thickness of the residual core layer, is suitable in the aluminium content in the corrosion layer,and is low in the aluminium powder and foreign ion content, and the contact resistance can be reduced more than 40%.

Description

technical field [0001] The invention relates to an electrochemical corrosion method of a low-voltage anode foil for capacitors. Background technique [0002] At present, the frequency conversion corrosion method of low-voltage corrosion foil for aluminum electrolytic capacitors is: ①acid solution pretreatment; ②porosity corrosion; ③hole expansion corrosion; ④post-treatment, cleaning and annealing. The power frequency used in the corrosion process is power frequency (50Hz). After corrosion, the thickness of the residual core layer is uneven, the corrosion amount of the corrosion layer is relatively large, and the corroded aluminum powder is not fully cleaned, resulting in a large contact resistance of the electrode foil after formation; in addition, the cleaning effect If it is not good, it will also cause residual impurity ions, which will affect the leakage current of the electrode foil and the service life of the aluminum electrolytic capacitor. Contents of the invention...

Claims

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Application Information

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IPC IPC(8): H01G9/055C23F1/20
CPCC23F1/20H01G9/055
Inventor 严季新陈健王建中赵宇飞
Owner NANTONG HAIXING ELECTRONICS
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