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Manufacturing method of electrode foil for surface-mounting aluminum electrolytic capacitor

An aluminum electrolytic capacitor, surface mount technology, applied in the direction of electrolytic capacitors, capacitors, circuits, etc., can solve the problems of large leakage current, capacity dispersion, and bending dispersion of the formed foil, so as to meet the requirements of use and improve the use of life and the effect of reducing leakage current

Inactive Publication Date: 2019-04-09
NANTONG HAIXING ELECTRONICS +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional method is not in place before the aluminum foil is perforated. In the later corrosion process, the foil surface cannot be uniformly perforated and expanded, resulting in uneven corrosion of the foil and inconsistent residual cores of the corroded foil, resulting in poor capacity dispersion and large bending dispersion.
Cannot meet the requirement of small cut width of electrode foil for surface mount capacitors
The traditional cleaning method cannot clean the deep-layer impurities of the low-voltage corrosion foil containing the sponge layer, and its content is about 3-10ppm, resulting in a large leakage current and high impedance of the final formed foil, which cannot meet the low leakage of the electrode foil of the surface mount capacitor. current, low impedance requirements

Method used

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  • Manufacturing method of electrode foil for surface-mounting aluminum electrolytic capacitor

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Embodiment 1

[0019] The 91μm thick aluminum foil with a purity of 99.98% is soaked in 0.5% phosphoric acid solution for 1min, and then passed through the current density of 1A / cm 2 The instantaneous high-frequency current is used for surface electrolysis treatment, and the reaction temperature is 50°C; the above-mentioned pretreated aluminum foil is placed in a mixed aqueous solution for a galvanic corrosion, the energization frequency is 80Hz, the reaction temperature is 20°C, and the reaction time is 1min: Then place it in the mixed aqueous solution for chemical corrosion, the reaction temperature is 40°C, and the reaction time is 30s; then place it in the mixed aqueous solution for secondary electrification corrosion, the electrification frequency is 70Hz, the reaction temperature is 20°C, and the reaction time is 2min30s; Then put it in the mixed aqueous solution for three times of electrification corrosion, the electrification frequency is 60Hz, the reaction temperature is 20°C, and th...

Embodiment 2

[0020] Example 2: A 91 μm thick aluminum foil with a purity of 99.98% is soaked in 0.7% phosphoric acid solution for 1 min, and then passed through with a current density of 1.5 A / cm 2 The instantaneous high-frequency current is used for surface electrolysis treatment, and the reaction temperature is 40°C; the above-mentioned pretreated aluminum foil is placed in a mixed aqueous solution for a galvanic corrosion, the energization frequency is 70Hz, the reaction temperature is 30°C, and the reaction time is 1min: Then put it in the mixed aqueous solution for chemical corrosion, the reaction temperature is 50°C, and the reaction time is 30s; then put it in the mixed aqueous solution for secondary electrification corrosion, the electrification frequency is 60Hz, the reaction temperature is 30°C, and the reaction time is 2min30s; Then put it in the mixed aqueous solution for three times of electrification corrosion, the electrification frequency is 50Hz, the reaction temperature is...

Embodiment 3

[0021] Example 3: A 91 μm thick aluminum foil with a purity of 99.98% is soaked in 1% phosphoric acid solution for 1 min, and then passed through with a current density of 1 A / cm 2 The instantaneous high-frequency current is used for surface electrolysis treatment, and the reaction temperature is 30°C; the above-mentioned pretreated aluminum foil is placed in a mixed aqueous solution for a galvanic corrosion, the energization frequency is 60Hz, the reaction temperature is 40°C, and the reaction time is 1min: Then place it in the mixed aqueous solution for chemical corrosion, the reaction temperature is 60°C, and the reaction time is 30s; then place it in the mixed aqueous solution for secondary electrification corrosion, the electrification frequency is 50Hz, the reaction temperature is 40°C, and the reaction time is 2min30s; Then put it in the mixed aqueous solution for three times of electrification corrosion, the electrification frequency is 40Hz, the reaction temperature is...

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Abstract

The invention discloses a manufacturing method of electrode foil for a surface-mounting aluminum electrolytic capacitor. The method comprises the following steps: soaking aluminum foil in a phosphoricacid solution, and applying transient large current, placing in the mixed aqueous solution to perform repeated power-up corrosion, placing the aluminum foil in the mixed solution containing sulfamicacid and citric acid, soaking in the pure water at 40 DEG C, placing the aluminum foil in an oven, performing thermal treatment at 500 DEG C, applying the required voltage in the formation liquid containing 4%-15% at 70-90 DEG C, and performing formation treatment, and finally drying. The manufacturing method disclosed by the invention has the advantages that the obtained electrode foil residual core is good in consistency, and has the advantages of being high in intensity and low in impedance; and meanwhile, the electrode foil impurity ion content can be effectively controlled to be lower than 1ppm, the electrode foil leakage current is greatly reduced, and the service life is improved. And a use requirement of the surface-mounting aluminum electrolytic capacitor is satisfied.

Description

technical field [0001] The invention relates to a method for manufacturing electrode foil for surface mounting aluminum electrolytic capacitors. Background technique [0002] Generally speaking, the aluminum electrode foil for low-voltage aluminum electrolytic capacitors is chemically or electrochemically corroded in an aqueous solution containing hydrochloric acid, sulfuric acid, nitric acid, and phosphoric acid. A large amount of aluminum powder, chloride ions, and sulfate groups are attached to the foil surface. Impurities such as ions need to be removed with a certain cleaning solution. The common cleaning method is chemical cleaning with nitric acid or sulfuric acid solution, followed by rinsing with normal temperature pure water, and finally heat treatment to form a hydration film. [0003] The traditional method is not in place before the aluminum foil is perforated. During the later corrosion process, the foil surface cannot be uniformly perforated and expanded, resu...

Claims

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Application Information

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IPC IPC(8): H01G9/055
CPCH01G9/055C25F3/04H01G9/045
Inventor 周小兵吴春春
Owner NANTONG HAIXING ELECTRONICS
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