Treatment method of medium-high-voltage anode foils

A processing method and technology of anode foil, applied in electrolytic coatings, surface reaction electrolytic coatings, electrolytic capacitors, etc., can solve the problems of uneven pores, excessive dissolution, reduction of foil specific volume, etc., to reduce the growth rate and improve the specific volume. , into the effect of increasing the specific volume

Inactive Publication Date: 2015-01-21
DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the inhomogeneity of the pores, if the unsaturated acid treatment time is too long, the formed hydration film will be excessively dissolved; if the unsaturated acid treatment time is too

Method used

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  • Treatment method of medium-high-voltage anode foils
  • Treatment method of medium-high-voltage anode foils

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Corrosion foil with a purity of 99.99% is boiled in pure water above 97°C for 2-4 minutes, then boiled in 0.5wt% silicate solution above 97°C for 20-30 minutes, washed with pure water, Put it into 0.2wt% aqueous solution of phosphate and citrate at 85°C for the first-stage chemical formation with a current density of 40Ma·cm -2 After reaching the predetermined voltage of 160V, the constant voltage was kept for 10 minutes; in the mixed solution of 5wt% boric acid and citrate, secondary chemical formation was carried out, and after the predetermined voltage was 320V, the constant voltage was kept for 10 minutes; in the mixed solution of 5wt% boric acid and citrate Carry out three-stage formation in the solution, and keep the constant voltage for 15 minutes after reaching the predetermined voltage of 480V; then carry out four-stage formation in the mixed solution of 5wt% boric acid and citrate, and keep the constant voltage for 20 minutes after reaching the predetermined vo...

Embodiment 2

[0031] Corrosion foil with a purity of 99.99% is boiled in pure water above 97°C for 4-6 minutes, then boiled in 0.5wt% silicate solution above 97°C for 15-20 minutes, washed with pure water, Put it into 0.2wt% aqueous solution of phosphate and citrate at 85°C for the first-stage chemical formation with a current density of 40mA·cm -2 After reaching the predetermined voltage of 180V, the constant voltage is kept for 10 minutes; in the mixed solution of 5wt% boric acid and citrate, the secondary formation is carried out, and after the predetermined voltage is 360V, the constant voltage is kept for 10 minutes; in the mixed solution of 5wt% boric acid and citrate Carry out three-stage formation in the solution, and keep the constant voltage for 15 minutes after reaching the predetermined voltage of 540V; then carry out four-stage formation in the mixed solution of 5wt% boric acid and citrate, and keep the constant voltage for 20 minutes after reaching the predetermined voltage of ...

Embodiment 3

[0034] For corroded foil with a purity of 99.99%, boil it in pure water above 97°C for 6-8 minutes, put it into a 0.5wt% silicate solution above 97°C and boil it for 5-10 minutes, wash it with pure water, put it in 0.2wt%, 85 ℃ phosphate and citrate aqueous solution for the first stage of chemical formation, the current density is 40mA cm -2 After reaching the predetermined voltage of 200V, keep the constant voltage for 10 minutes; perform secondary formation in the mixed solution of 5wt% boric acid and citrate, and keep the constant voltage for 10min after reaching the predetermined voltage of 400V; Carry out three-stage formation in the solution, and keep the constant voltage for 15 minutes after reaching the predetermined voltage of 600V; then carry out four-stage formation in the mixed solution of 5wt% boric acid and citrate, and keep the constant voltage for 20 minutes after reaching the predetermined voltage of 650V; at 550°C After heat treatment for 2 minutes, put it in...

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Abstract

The invention relates to a treatment method of medium-high-voltage anode foils. The treatment method comprises the following steps: pretreatment, four-level formation, thermal treatment, second formation treatment, phosphoric acid depolarization treatment, third formation treatment, second thermal treatment, fourth formation treatment and phosphorization treatment, wherein the pretreatment is as follows: boiling for 2-7 minutes in purified water and then treating for 5-20 minutes in 0.2-2.0wt% of silicate solution; four-level formation is carried out in different formation voltages, and all levels of formation voltages are respectively 50-200V, 300-400V, 450-600V and 520-650V; the first-level formation is carried out in a phosphate and citrate mixed solution at 75-90DEG C, wherein the concentrations of phosphate and citrate are 0.15wt%-0.24wt%. By utilizing the treatment method, the blockage rate of corroded foils can be reduced, the utilization ratio of surface area of the corroded foils can be improved, so that the purposes of not only promoting the specific volume of the anode foils, but also increasing the quality of an oxidized film under the condition of not increasing formation energy consumption can be achieved.

Description

technical field [0001] The invention relates to the technical field of anode foil formation, in particular to a treatment method for medium and high voltage anode foils. Background technique [0002] Today's electronics industry tends to miniaturize the whole machine, and the capacitor occupies a large proportion of the space in the electronic product. It is determined by the specific volume of the anode foil, so increasing the specific volume of the anode foil will be an inevitable trend. According to the capacitance formula When the electrode spacing and dielectric constant are fixed, the best way to increase the specific volume of the anode foil is to increase the effective surface area of ​​the corroded foil during the corrosion process. The formation technology is used to increase the effective surface area of ​​the formation foil, thereby increasing the specific volume of the anode foil. Due to the poor uniformity of corroded foil holes in China and many branch hol...

Claims

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Application Information

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IPC IPC(8): C25D11/12H01G9/055
Inventor 周毅超
Owner DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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