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Etching process for aluminum foil for electrolytic capacitor

A technology for electrolytic capacitors and aluminum foils, applied in the direction of electrolytic capacitors, capacitors, capacitor electrodes, etc., can solve problems such as uneven surface of aluminum foil

Inactive Publication Date: 2008-10-01
日丰(清远)电子有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the near-micron area of ​​the aluminum foil surface, the corrosive liquid is basically in a static state, and the flow of the liquid can only be stirred by the hydrogen gas flow generated by the corrosion. The transmission of the corrosive liquid in the electrolytic cell is limited, which makes the surface of the etched aluminum foil uneven.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Example 1: (taking Xinjiang Zhonghe 105μm light foil as an example)

[0042] Take the light foil and proceed as follows in turn:

[0043] (1) Soak the light foil in 0.5wt% phosphoric acid solution at 60°C for 3 minutes;

[0044] (2) AC pre-corrode the light foil treated in step (1) for 30 seconds in a mixed solution containing 15wt% hydrochloric acid, 0.1wt% sulfuric acid, and 0.5wt% oxalic acid at 40°C, with a current density of 20A / dm 2 , power is 200C / dm 2 , power frequency 50Hz;

[0045] (3) Treat the foil treated in step (2) at 60° C. for 2 minutes with a medium chemical treatment containing 20 wt % hydrochloric acid, 0.15 wt % sulfuric acid, and 0.5 wt % oxalic acid mixture;

[0046] (4-1) The foil treated in step (3) is etched at 40°C in a mixed solution containing 22wt% hydrochloric acid, 0.15wt% sulfuric acid, and 1wt% oxalic acid. The tank is placed in an ultrasonic bath with a frequency of 28KHz. The corrosion current density is 5A / dm 2 , power is 600...

Embodiment 2

[0068] Example 2: (taking Xinjiang Zhonghe 105μm light foil as an example)

[0069] Take the light foil and proceed as follows in turn:

[0070] (1) Soak the light foil in 0.1wt% phosphoric acid solution at 80°C for 5 minutes;

[0071] (2) AC pre-corrode the light foil treated in step (1) for 30 seconds in a mixed solution containing 10wt% hydrochloric acid, 0.3wt% sulfuric acid, and 1wt% oxalic acid at 30°C, with a current density of 10A / dm 2 , power is 400C / dm 2 , power frequency 50Hz;

[0072] (3) Treat the foil treated in step (2) at 70° C. for 3 minutes in a medium containing 10wt% hydrochloric acid, 0.1wt% sulfuric acid, and 5wt% oxalic acid mixture;

[0073] (4-1) Put the foil treated in step (3) at 40° C. in a mixed solution containing 10wt% hydrochloric acid, 0.1wt% sulfuric acid, 5wt% oxalic acid, and 0.1wt% aluminum trichloride. , the etching tank containing the mixed solution is placed in an ultrasonic bath with a frequency of 50KHz during the etching process...

Embodiment 3

[0081] Example 3: (taking Xinjiang Zhonghe 105μm light foil as an example)

[0082] Take the light foil and proceed as follows in turn:

[0083] (1) Soak the light foil in 1wt% phosphoric acid solution at 70°C for 2 minutes;

[0084] (2) AC pre-corrode the light foil after step (1) for 30 seconds in a mixed solution containing 20wt% hydrochloric acid, 0.5wt% sulfuric acid, and 5wt% oxalic acid at 35°C, with a current density of 40A / dm 2 , power is 800C / dm 2 , power frequency 50Hz;

[0085] (3) Treat the foil treated in step (2) at 80° C. for 5 minutes in a medium containing 25 wt % hydrochloric acid, 0.5 wt % sulfuric acid, and 10 wt % oxalic acid mixture;

[0086] (4-1) Put the foil treated in step (3) at 40°C in a mixed solution containing 25wt% hydrochloric acid and 0.5wt% sulfuric acid for deep corrosion in the rear stage, and place the etching tank containing the mixed solution in the ultrasonic wave during the etching process. In the bath, the frequency is 100KHz. ...

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Abstract

The invention relates to a corrosion process of aluminum foil used in an electrolytic capacitor, which includes six steps: pre-treatment, exchange of pre-corrosion, intermediate processing, post-level AC corrosion, DC corrosion, and after treatment, is characterized in that ultrasound-assisted corrosion is used in the post-level AC corrosion; at the same time, the invention divides the post-level AC corrosion into a plurality of levels, the temperatures are gradually reduced from the first level to the end, but the current densities are increased gradually. The craft of the invention keeps that the etching solution is transferred smoothly in a tank, effectively prevents concentration polarization at the interface of aluminum foil-etching solution, promotes the removing of the corrosion sediments, and greatly enhances the corrosion efficiency.

Description

【Technical field】 [0001] The invention relates to an etching process, in particular to an aluminum foil etching process for electrolytic capacitors. 【Background technique】 [0002] Electrode foil is an electronic product produced through a special corrosion chemical process. It is difficult to produce and has high technical content. High-end products (high specific volume and high strength) have long been dependent on imports. In recent years, with the rapid growth of demand for electronic products, the output of electrolytic capacitors has continued to increase, and the demand for electrode foil has also continued to increase. One of the key technologies to obtain high specific capacity electrolytic capacitors is to use special electrochemical surface expansion technology to etch a large number of pits on the surface of aluminum foil in the depth direction to increase the specific surface area. AC corrosion has long been the main method of producing aluminum parts such as ...

Claims

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Application Information

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IPC IPC(8): C25F3/04H01G9/055H01G9/04
Inventor 纪力荣曾建皇陈建军刘伟强
Owner 日丰(清远)电子有限公司
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