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Corrosion method for expanding face of lead anode foils in branch holes

A technology of aluminum anodes and branches, applied in the direction of electrical components, electrolytic capacitors, capacitors, etc., can solve the problems of reducing the capacitance of aluminum anode foil, complex process and equipment, and small capacitance, and achieve the expansion of real surface area, large surface area and mechanical Intensity, dosage reduction effect

Inactive Publication Date: 2007-05-09
NANTONG HAIXING ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Chinese patent CN85101034 discloses a method for electrochemical surface expansion of high-voltage aluminum anode foil. Both steps of this method use current etching, and the process and equipment are complicated. In addition, only hydrochloric acid and aluminum chloride are used in the first step of etching liquid. The capacitance is also small
[0010] None of the above-mentioned inventions involves the precipitation of amphoteric aluminum ions in the tunnel holes, blocking the corrosion pits produced by erosion, affecting and reducing the capacitance of the aluminum anode foil

Method used

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  • Corrosion method for expanding face of lead anode foils in branch holes
  • Corrosion method for expanding face of lead anode foils in branch holes

Examples

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Embodiment 1

[0029] A method for surface expansion and erosion of branch hole aluminum anode foil, comprising the following steps in sequence:

[0030] ①Put the aluminum foil in a solution containing Cl -1 The electrochemical erosion current is applied in the mixed acid solution of -1 Mixed acid was prepared by using 1.5mol / L HCl and 3mol / L H 2 SO 4 The treatment time was 3 minutes, the temperature of the mixed acid solution was 75 °C, and the current was pulsed direct current.

[0031] ②The aluminum foil treated in step ① was soaked and eroded in 0.1mol / L HCl solution, and ultrasonic waves were applied at the same time; the ultrasonic intensity was 100W, the erosion treatment time was 120 seconds, and the temperature of the HCl solution was 40°C.

[0032] ③ Place the aluminum foil processed in step ② in a Cl-containing solution adjusted to pH 2 with sodium oxalate / oxalic acid. -1 Erosion treatment in solution, applying ultrasonic waves at the same time, and applying electrochemical er...

Embodiment 2

[0035] A method for surface expansion and erosion of branch hole aluminum anode foil, comprising the following steps in sequence:

[0036] ①Put the aluminum foil in a solution containing Cl -1 The electrochemical erosion current is applied in the mixed acid solution of -1 Mixed acid is prepared by using 1.2mol / L HCl and 2mol / L H 2 SO 4 , 0.6mol / L HNO 3 The treatment time was 3 minutes, the temperature of the mixed acid solution was 60 °C, and the current was pulsed direct current.

[0037] ② Put the aluminum foil treated in step ① in 0.1mol / L H 3 PO 4 Soak erosion treatment with 0.1mol / L HF mixed solution, and apply ultrasonic waves at the same time; ultrasonic intensity is 120W, erosion treatment time is 80 seconds, and the temperature of HCl solution is 60 °C.

[0038] ③ Place the aluminum foil treated in step ② in a Cl-containing solution adjusted to pH 6 with borax / boric acid. -1 Erosion treatment in solution, while applying ultrasonic waves, and applying electroche...

Embodiment 3

[0041] A method for surface expansion and erosion of branch hole aluminum anode foil, comprising the following steps in sequence:

[0042] ①Put the aluminum foil in a solution containing Cl -1 The electrochemical erosion current is applied in the mixed acid solution of -1 Mixed acid is prepared by using 2mol / L KCl and 4mol / L H 3 PO 4 The treatment time was 2.5 minutes, the temperature of the mixed acid solution was 85°C, and the current was pulsed direct current.

[0043] ②The aluminum foil treated in step ① was soaked and eroded in 0.15mol / L HF solution, and ultrasonic waves were applied at the same time; the ultrasonic intensity was 150W, the erosion treatment time was 60 seconds, and the temperature of the HCl solution was 80°C.

[0044] ③Place the aluminum foil processed in step ② in a Cl-containing solution adjusted to pH 8 with phosphoric acid / sodium hydrogen phosphate. -1 Erosion treatment in solution, applying ultrasonic waves at the same time, and applying electro...

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Abstract

This invention discloses a method for tunnel etching anode Al foil with branched pores. The method comprises: (1) placing Al foil in mixed acid solution containing Cl-, and applying an electrochemical etching current; (2) immersing Al foil in an acid solution for etching, and applying ultrasonic wave; (3) placing Al foil in Cl-containing solution with a pH value of 2-9 for etching, applying ultrasonic wave, and applying an electrochemical etching current; (4) placing Al foil in HCl / oxalic acid mixed solution, and applying a DC for pore expansion treatment. This invention provides an etching method for obtaining anode Al foil with larger capacity and better uniformity. Besides, the content of harmful elements in the electrolyte does not increase. The method can effectively increase the capacity of etched Al foil, as well as the capacity deviation of etched Al foil.

Description

Technical field: [0001] The invention relates to a method for surface expansion and erosion of aluminum foils of aluminum electrolytic capacitors. Background technique [0002] The electrode of aluminum electrolytic capacitor is aluminum foil. Since the capacitance of the capacitor is proportional to the real surface area of ​​the capacitor electrode, the larger the capacitance of the electrode material (aluminum foil) per unit area, the less electrode material is used in the rated capacity capacitor, and the capacitor's The smaller the volume, the smaller the size of the aluminum electrolytic capacitor can be, which is suitable for the miniaturization and miniaturization of today's electronic equipment. In order to increase the surface area of ​​the aluminum electrode foil, the usual method is to use erosion technology to form a large number of small holes in the thickness direction of the aluminum foil to expand the real surface area of ​​the aluminum foil used as the capa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25F3/04H01G9/055
Inventor 严季新王建中闫康平
Owner NANTONG HAIXING ELECTRONICS
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