Manufacturing method of middle-high voltage corrosion foil for aluminum electrolytic capacitor

A medium and high voltage corrosion foil and aluminum electrolytic capacitor technology, applied in the field of two-stage annealing heat treatment process of aluminum electrolytic capacitor anode foil, to achieve the effect of improving bending performance

Active Publication Date: 2018-08-14
NANTONG HAIXING ELECTRONICS +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional annealing process is generally kept at a

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A method for manufacturing medium and high voltage corroded foils for aluminum electrolytic capacitors, the specific steps are as follows:

[0021] (a) Using 1wt% sodium hydroxide solution, at a temperature of 60°C, pre-soak aluminum foil for medium and high voltage electrolytic capacitors for 120s;

[0022] (b) The anode foil obtained in step (a) is subjected to energized porosity corrosion for 600s at a temperature of 90°C using a mixed solution of 1wt% hydrochloric acid and 40wt% sulfuric acid;

[0023] (c) The anode foil obtained in step (b) is corroded with 1wt% hydrochloric acid, 3wt% sulfuric acid, and 0.05wt% phosphoric acid at a temperature of 95°C for 600s;

[0024] (d) The anode foil obtained in step (c) is soaked in 1wt% nitric acid solution at 60°C for 120s, and then washed with tap water and pure water;

[0025] (e) The anode foil obtained in step (d) goes through a heating stage with a heating rate of 30°C / s to reach the first-level constant temperature ...

Embodiment 2

[0031] A method for manufacturing medium and high voltage corroded foils for aluminum electrolytic capacitors, the specific steps are as follows:

[0032] (a) Using 2wt% sodium hydroxide solution, at a temperature of 20°C, conduct a pre-immersion treatment of aluminum foil for medium and high voltage electrolytic capacitors for 100s;

[0033] (b) The anode foil obtained in step (a) is subjected to energized porosity corrosion for 500s at a temperature of 70°C using a mixed solution of 2wt% hydrochloric acid and 10wt% sulfuric acid;

[0034] (c) The anode foil obtained in step (b) is corroded with 2wt% hydrochloric acid, 5wt% sulfuric acid, and 0.01wt% phosphoric acid at a temperature of 80°C for 500s;

[0035] (d) The anode foil obtained in step (c) is soaked in 2wt% nitric acid solution at a temperature of 60°C for 100s, and then washed with tap water and pure water;

[0036] (e) The anode foil obtained in step (d) goes through a heating stage with a heating rate of 40°C / s t...

Embodiment 3

[0042] A method for manufacturing medium and high voltage corroded foils for aluminum electrolytic capacitors, the specific steps are as follows:

[0043] (a) Use 5wt% sodium hydroxide solution to soak the aluminum foil for medium and high voltage electrolytic capacitors for 100s at a temperature of 40°C;

[0044] (b) The anode foil obtained in step (a) is subjected to energized porosity corrosion for 400s at a temperature of 60°C using a mixed solution of 4wt% hydrochloric acid and 20wt% sulfuric acid;

[0045] (c) The anode foil obtained in step (b) is corroded for 300 s by energizing hole expansion at a temperature of 70°C with 5wt% hydrochloric acid, 10wt% sulfuric acid, and 0.03wt% phosphoric acid solution;

[0046] (d) The anode foil obtained in step (c) was soaked in 8wt% nitric acid solution at a temperature of 30°C for 60s, and then washed with tap water and pure water;

[0047] (e) The anode foil obtained in step (d) goes through a heating stage with a heating rate ...

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PUM

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Abstract

The invention discloses a manufacturing method of a middle-high voltage corrosion foil for an aluminum electrolytic capacitor. The manufacturing method comprises the following steps that a middle-highvoltage electronic aluminum plain foil is adopted and is soaked and pretreated by a sodium hydroxide solution; a hydrochloric acid and sulfuric acid solution is subjected to electrifying hole corrosion; a hydrochloric acid, sulfuric acid and phosphoric acid solution is subjected to chambering electrifying corrosion; salpeter solution soaking is carried out; and after pure water cleaning, primarynitrogen protection annealing and secondary nitrogen protection annealing heat treatment is carried out. Two stages of annealing heat treatment are adopted, and comprise a heating stage, a primary constant temperature stage, a linear temperature changing stage, a secondary constant temperature stage and a cooling stage. By means of two stages of nitrogen protection annealing heat treatment, the bending performance of the electrode foil is improved through the recovery and recrystallization process of aluminum metal. After the corrosion foil prepared through the method is subjected to formationtreatment, the bending performance is improved by 20% or above, and a great promotion effect is achieved on miniaturization of the aluminum electrolytic capacitor.

Description

technical field [0001] The invention belongs to a method for manufacturing medium and high voltage anode foils for aluminum electrolytic capacitors, and in particular relates to a two-stage annealing heat treatment process for anode foils of aluminum electrolytic capacitors. Background technique [0002] At present, aluminum electrolytic capacitors are developing towards miniaturization and miniaturization, and the requirements for the bending performance of anode foils for aluminum electrolytic capacitors are constantly increasing to meet the manufacturing needs of cutting smaller widths and winding smaller diameters. At present, the manufacturing methods of medium and high voltage corrosion foils for aluminum electrolytic capacitors are: ① pretreatment; ② hole corrosion; ③ hole expansion corrosion; ④ post treatment, cleaning; Specifically: Sodium hydroxide solution is used to pre-soak aluminum foil for medium and high voltage electrolytic capacitors; the anode foil obtaine...

Claims

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Application Information

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IPC IPC(8): C25F3/04C22F1/02C22F1/04C23F1/36
CPCC22F1/02C22F1/04C23F1/36C25F3/04
Inventor 严季新赵宇飞顾建萍
Owner NANTONG HAIXING ELECTRONICS
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