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Corrosion process for anode aluminum foil with tunnel branched holes for aluminum electrolytic capacitor

A technology of aluminum electrolytic capacitors and tunnel branches, applied in the direction of electrolytic capacitors, capacitors, circuits, etc., to achieve the effect of obvious features, short steps and less harmful effects

Inactive Publication Date: 2015-09-02
LIAOCHENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the above problems, the purpose of the present invention is to overcome the deficiency that the current traditional tunnel main hole corrosion process cannot produce tunnel branch holes and the existing tunnel branch hole corrosion process tunnel Due to the disadvantages of low branch hole density, limited to the bottom of the tunnel main hole, cumbersome process, and poor environmental protection, we provide an etching process that can grow tunnel branch holes on the entire length of the tunnel main hole. Compared with the existing technology, this Simple process, high production efficiency, health and environmental protection, well-developed tunnel holes, can greatly improve the specific surface area and electrostatic capacity of aluminum foil

Method used

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  • Corrosion process for anode aluminum foil with tunnel branched holes for aluminum electrolytic capacitor
  • Corrosion process for anode aluminum foil with tunnel branched holes for aluminum electrolytic capacitor
  • Corrosion process for anode aluminum foil with tunnel branched holes for aluminum electrolytic capacitor

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Embodiment 1

[0038] The thickness of the aluminum foil is 80μm. After the aluminum foil is pretreated, it is subjected to primary pore corrosion, and the pore current density is 100 mA / cm 2 , The hole electricity density is 20C / cm 2 ; Rinse with pure water and put it into a neutral salt solution containing additives for intermediate corrosion, the current density is 150 mA / cm 2 , The power density is 10C / cm 2 ; After cleaning with pure water, implement secondary reaming corrosion, reaming current density is 50 mA / cm 2 , The hole reaming power density is 30C / cm 2 ; After cleaning with pure water, post-treatment is carried out; after cleaning, drying is performed, and the thickness of the aluminum foil is about 80μm. Among them, the neutral salt solution is NaNO with a concentration of 0.5 wt% 3， The trace additives are oxalic acid with a concentration of 0.01 wt% and ZnO with a concentration of 0.01 wt %.

Embodiment 2

[0040] The thickness of the aluminum foil is 90μm. After the aluminum foil is pretreated, it is subjected to primary pore corrosion, and the pore current density is 150 mA / cm 2 , The hole electricity density is 18C / cm 2 ; Rinse with pure water and put it into a neutral salt solution containing additives for intermediate corrosion, the current density is 100 mA / cm 2 , The power density is 12C / cm 2 ; After cleaning with pure water, implement secondary reaming corrosion, reaming current density is 60 mA / cm 2 , The hole reaming power density is 30C / cm 2 ; After cleaning with pure water, post-treatment is carried out; after cleaning, it is dried and awaiting chemical conversion. Among them, the neutral salt solution is NaCl with a concentration of 5.5wt% ， The trace additives are a mixture of oxalic acid, citric acid and boric acid with a concentration of 0.1 wt%, and a concentration of 0.05 wt% of In(NO 3 ) 3 .

Embodiment 3

[0042] The thickness of the aluminum foil is 100μm. After the aluminum foil is pretreated, it is subjected to first-level pore corrosion, and the pore current density is 200 mA / cm 2 , The hole electricity density is 22C / cm 2 ; Rinse with pure water and put it into a neutral salt solution containing additives for intermediate corrosion, the current density is 100 mA / cm 2 , The power density is 8C / cm 2 ; After cleaning with pure water, perform secondary reaming corrosion, reaming current density is 45 mA / cm 2 , The hole reaming power density is 30C / cm 2 ; After cleaning with pure water, post-treatment is carried out; after cleaning, drying is performed, and the thickness of the aluminum foil is about 100μm. Among them, the neutral salt solution is KCl with a concentration of 10wt% ， The trace additives are tartaric acid and benzoic acid with a concentration of 0.2 wt% and ZnO, PbO and Bi (NO 3 ) 3 .

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Abstract

The invention discloses a corrosion process for an anode aluminum foil with tunnel branched holes for an aluminum electrolytic capacitor. The corrosion process comprises the following steps: pretreatment; primary hole-foaming corrosion; intermediate corrosion; secondary pitting corrosion; and post-treatment. Different from the prior art, in intermediate corrosion, a neutral salt solution containing a trace additive A and a trace additive B as an electrolytic corrosion solution, wherein the additive A can be one or more of weak acids such as oxalic acid, citric acid, boric acid, adipic acid, tartaric acid and benzoic acid and the additive B can be one or more of negative metal salt or oxides such as ZnO, PbO, In(NO3)3 and Bi(NO3)3. The corrosion process disclosed by the invention has the positive effects that a plurality of tunnel branched holes vertical to a tunnel main hole are formed in the side wall of the tunnel main hole on the surface of an aluminum foil, so that the specific surface area and the specific surface area of the aluminum foil are improved, and the mechanical property of the aluminum foil is better maintained.

Description

Technical field: [0001] The invention relates to an corrosion process of an anode aluminum foil for an aluminum electrolytic capacitor, in particular to an corrosion process for an anode aluminum foil with a tunnel branch hole for an aluminum electrolytic capacitor. Background technique: [0002] Aluminum electrolytic capacitors have the characteristics of small size and large capacitance. The price per unit capacitance is the cheapest among all capacitors, which is in line with the development trend of low-cost information products. It is widely used and has a huge market demand. It has the largest output and output value among all capacitors. varieties. Electrode aluminum foil is the key material for manufacturing aluminum electrolytic capacitor electrodes and dielectric layers, including cathode aluminum foil and anode aluminum foil, whose cost accounts for about 70% of the total cost of the capacitor on average, and the anode aluminum foil plays a decisive role in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25F3/04H01G9/055
Inventor 班朝磊朱淑芹李文智王长征倪俊杰马杰
Owner LIAOCHENG UNIV
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