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Anode aluminium foil etching process for electrolytic capacitor

A technology for electrolytic capacitors and anode aluminum foil, applied in electrolytic capacitors, capacitors, capacitor manufacturing, etc., can solve the problems of uneven distribution of corrosion holes, decreased mechanical strength, insufficient hole density, etc., to improve the corrosion area expansion rate and good mechanical strength. , Easy and uniform pitting effect

Inactive Publication Date: 2003-11-26
RUYUAN YAO AUTONOMOUS COUNTY DONGYANGGUANG FORMED FOIL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing pretreatment process is to immerse the aluminum foil directly in an acid or alkali solution for a few minutes at a certain temperature. This treatment removes the oil and oxide film on the surface of the aluminum foil and also dissolves the impurity elements on the surface of the aluminum foil that are conducive to pores, causing corrosion. Uneven distribution of pores, insufficient density of pores and reduced mechanical strength

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] In Example 1, after immersing the aluminum foil in a pretreatment solution with a temperature of 40°C and a concentration of 5.0wt% NaOH+0.005wt% ZnO for 120 seconds, the usual pre-etch, post-etch and post-treatment are performed.

Embodiment 2

[0011] Embodiment 2 is that the aluminum foil is heated at a temperature of 80°C and a concentration of 5.0wt%H 2 SO 4 +0.005wt%PbO pre-treatment solution soaked for 120 seconds, then the usual pre-etch, post-etch and post-treatment.

Embodiment 3

[0012] Embodiment 3 is that the aluminum foil is heated at a temperature of 70°C and a concentration of 5.0wt%H 3 PO 4 +0.005wt% ZnO pre-treatment solution soaked for 120 seconds, and then the usual pre-etch, post-etch and post-treatment.

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Abstract

The etching process of anode aluminum foil for electrolytic capacitor includes one pre-treatment step. The pretreating solution is solution of alkali, acid or their mixture with Zn and / or Pb compound in 0.0001-1.0 wt% added. Aluminum foil is soaked in the pretreating solution for 10-300 sec, and owing to the separation of Zn and / or Pb, the aluminum foil surface becomes more easy in producing homogeneous spot etching in the fore etching process, and this results in raised area expanding rate, specific capacitance and tensile strength of the aluminum foil.

Description

technical field [0001] The invention relates to a metal corrosion process, in particular to a pretreatment method for an electrolytic capacitor anode aluminum foil corrosion process. Background technique [0002] Aluminum foil for electrolytic capacitor anode, in order to expand its effective surface area and increase the electrostatic capacity (specific capacity) per unit area, is generally subjected to chemical or electrochemical corrosion treatment to form high-density uniformly distributed corrosion pits with a certain depth on the surface. Thereby increasing the surface area of ​​the aluminum foil. The corrosion process generally includes the following steps: pre-treatment, pre-corrosion, post-corrosion, and post-treatment. Pre-treatment is a variety of physical and chemical treatments before electro-etching the light foil. Its main function is to remove oil, impurities and natural oxide film on the surface of the aluminum foil, adjust the structure of the aluminum foi...

Claims

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Application Information

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IPC IPC(8): H01G9/055
Inventor 吕根品罗向平吴志坚
Owner RUYUAN YAO AUTONOMOUS COUNTY DONGYANGGUANG FORMED FOIL CO LTD
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