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Low-voltage anode foil pretreatment

A low-voltage anode foil and process technology, applied in electrolytic capacitors, capacitor manufacturing, electrical components and other directions, can solve the problems of poor mechanical strength, low specific capacitance of anode foil, uniform microstructure on the surface of aluminum foil, etc., and achieve good mechanical strength and weight loss. small effect

Inactive Publication Date: 2007-09-05
DONGGUAN HEC CONDENSER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Among them, the corrosion step generally uses hydrochloric acid as the main solution as the corrosion medium; while the traditional pretreatment technology generally uses phosphoric acid or nitric acid aqueous solution for pretreatment. different, which is not conducive to the formation of uniformly distributed initial pits during corrosion, resulting in a lower specific capacitance and poor mechanical strength of the final anode foil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Pre-treatment: Use Xinjiang Zhonghe 95 micron thick unannealed light aluminum foil, heat treatment at 500 ° C for 1 minute, and then use 3wt% sodium hydroxide and 1% sodium dodecylbenzene sulfonate mixed aqueous solution, the temperature is 40 Treat at ℃ for 60 seconds, wash with tap water for 3 minutes, and then use 3wt% hydrochloric acid at 40℃ for 60 seconds; the results are as follows: for the foil after corrosion, the specific capacitance measured at 21TV is 77 microfarads / square centimeter, the remaining weight of the corroded sample is 0.1243 grams (7 square centimeters), and the tensile force is 18 N / cm.

Embodiment 2

[0031] Pre-treatment: use Xinjiang Zhonghe 95 micron thick unannealed light aluminum foil, heat treatment at 300 ° C for 3 minutes, and then use 9 wt% sodium hydroxide and 3% sodium dodecylbenzene sulfonate mixed aqueous solution, the temperature is 30 ℃ for 90 seconds, tap water for 5 minutes, and then 10wt% hydrochloric acid at 30 ℃ for 90 seconds; the results are as follows: for the foil after corrosion, the specific capacitance measured at 21TV is 75 microfarads / square centimeter, the remaining weight of the corroded sample is 0.1266 grams (7 square centimeters), and the tensile force is 18 N / cm.

[0032] As can be seen from the above two examples, under the completely same subsequent corrosion process, the product obtained by using the pretreatment method of the present invention is compared with the product obtained by using phosphoric acid or nitric acid pretreatment under normal circumstances. The product prepared by the invention has about 10% higher specific volume ...

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Abstract

The invention is concerned with the preliminary treatment method for the low voltage anodic foil, includes the following steps: (1) processes the heating treatment to the low voltage foil that is not annealing in 300-600deg.Cfor 0.5-3 minutes; (2) processes the anodic foil at the temperature of 20-70deg.Cfor 30-90 seconds in the mixing liquor of 0.5-10wt% of the sodium hydroxide and 1-5wt% of the dodecyl benzene sulfonic acid sodium; (3) processes the anodic foil at the temperature of 20-70deg.Cfor 30-90 seconds in the mixing liquor of 1-10wt% of the hydrochloric acid; (4) processes the first level erosion, the middle processing, the second level erosion, and the post processing, in order to get the low voltage anodic foil that is small weightlessness, high specific volume, and better machinery intensity.

Description

technical field [0001] The invention belongs to a method for manufacturing a low-voltage anode foil for an aluminum electrolytic capacitor. Background technique [0002] In the low-voltage products of aluminum electrolytic capacitors, the traditional method of producing low-voltage anode foil generally adopts the following process steps to treat the light aluminum foil: the main purpose of pretreatment is to remove oil and impurities on the surface of the aluminum foil, so that the microstructure of the surface of the aluminum foil is uniform, which is beneficial to Form uniformly distributed initial corrosion pits during corrosion; the main purpose of primary corrosion is to initiate initial corrosion pits on the surface of aluminum foil, and make the distribution of corrosion pits uniform and the pore size reasonable; the purpose of intermediate treatment is to wash away the corrosion produced during the primary corrosion process Deposited film that is not conducive to hol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/055H01G13/00C22F1/04C23F1/10
Inventor 吴勇
Owner DONGGUAN HEC CONDENSER CO LTD
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