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A pretreatment solution and formation process for improving the capacity of medium and high voltage formation foils for aluminum electrolytic capacitors

A technology for aluminum electrolytic capacitors and pretreatment liquids, applied in electrolytic coatings, surface reaction electrolytic coatings, anodic oxidation, etc., can solve the problems of limited capacity of aluminum electrolytic capacitors and insufficient capacity of formed foils for aluminum electrolytic capacitors, and achieve stability The effects of high performance and competitiveness, weak electron mobility, and low leakage current

Active Publication Date: 2020-05-22
YIDU DONGYANGGUANG FORMED FOIL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The formed foil for aluminum electrolytic capacitors made by this process has insufficient capacity. Due to capacity constraints, the capacity of the subsequent aluminum electrolytic capacitors is limited, and the bending strength needs to be further improved to adapt to the cutting and assembly of miniaturized capacitors.

Method used

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  • A pretreatment solution and formation process for improving the capacity of medium and high voltage formation foils for aluminum electrolytic capacitors
  • A pretreatment solution and formation process for improving the capacity of medium and high voltage formation foils for aluminum electrolytic capacitors

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Step 1: Take the 99.99% aluminum foil after electrolytic corrosion treatment and immerse it in pure water at 97°C for 20 minutes;

[0036] The second step: the pretreatment phosphoric acid concentration is 2ml / L, the sodium phytate concentration is 0.25g / L, the glucose concentration is 0.25g / L, the sodium bicarbonate concentration is 3.2g / L, the pH is 5.8, and the bath temperature is 70 ℃, treatment time 2 minutes;

[0037] The third step: in the first stage, the concentration of boric acid is 100g / L, the concentration of ammonium pentaborate is 20g / L, the concentration of sodium phytate is 0.5g / L, the temperature of the bath is 85°C, the formation voltage is 200V, and the current density is 70mA / cm 2 , the formation time is 7 minutes;

[0038] Step 4: In the second stage, the concentration of boric acid is 100g / L, the concentration of ammonium pentaborate is 4g / L, the concentration of sodium phytate is 0.3g / L, the temperature of the bath is 85°C, the formation voltage i...

Embodiment 2

[0049] Step 1: Take the 99.99% aluminum foil after electrolytic corrosion treatment and immerse it in pure water at 97°C for 20 minutes;

[0050] The second step: the pretreatment phosphoric acid concentration is 5ml / L, the sodium phytate concentration is 0.5g / L, the glucose concentration is 0.5g / L, the sodium bicarbonate concentration is 4g / L, the pH is 6.2, and the bath temperature is 60°C , the processing time is 3 minutes;

[0051] The third step: in the first stage, the concentration of boric acid is 100g / L, the concentration of ammonium pentaborate is 20g / L, the concentration of sodium phytate is 0.5g / L, the temperature of the bath is 85°C, the formation voltage is 200V, and the current density is 70mA / cm 2 , the formation time is 7 minutes;

[0052] Step 4: In the second stage, the concentration of boric acid is 100g / L, the concentration of ammonium pentaborate is 4g / L, the concentration of sodium phytate is 0.3g / L, the temperature of the bath is 85°C, the formation vo...

Embodiment 3

[0063] Step 1: Take the 99.99% aluminum foil after electrolytic corrosion treatment and immerse it in pure water at 97°C for 20 minutes;

[0064] The second step: the pretreatment phosphoric acid concentration is 2ml / L, the sodium phytate concentration is 0.25g / L, the glucose concentration is 0.25g / L, the sodium bicarbonate concentration is 3.2g / L, the pH is 5.8, and the bath temperature is 70 ℃, treatment time 2 minutes;

[0065] The third step: in the first stage, the concentration of boric acid is 100g / L, the concentration of ammonium pentaborate is 20g / L, the temperature of the bath solution is 85°C, the formation voltage is 200V, and the current density is 70mA / cm 2 , the formation time is 7 minutes;

[0066] Step 4: In the second stage, the concentration of boric acid is 100g / L, the concentration of ammonium pentaborate is 4g / L, the concentration of sodium phytate is 0.3g / L, the temperature of the bath is 85°C, the formation voltage is 400V, and the current density is 7...

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Abstract

The invention relates to the technical field of medium-high pressure formed foil, in particular to a pretreatment solution for improving the capacity of medium-high pressure formed foil used for an aluminum electrolytic capacitor and a formation process. The formation process is characterized in that aluminum foil obtained after electrolytic corrosion treatment is subjected to immersion treatmentin pure water with the temperature ranging from 90 DEG C to 100 DEG C; after being taken out, the aluminum foil is pretreated in a solution adopting phosphoric acid or phosphate as a main solute, andglucose and phytate are added into the pretreatment solution as a supplementary additive; and after pure water is used for cleaning, four stages of formation treatment are carried out, and phytate orphytic acid is added into a first-stage formation solution and a second-stage formation solution as a supplementary additive. The capacity of the formed foil is improved by 20%-25%, leak currents arereduced, and bending is improved.

Description

technical field [0001] The invention relates to the technical field of medium and high voltage forming foils, in particular to a pretreatment solution and a forming process for improving the capacity of medium and high voltage forming foils for aluminum electrolytic capacitors. Background technique [0002] Capacitor is a kind of energy storage element, which is one of the main electronic components. It plays the role of tuning, filtering, coupling, bypass and energy conversion in the circuit. Aluminum electrolytic capacitor is the most widely used capacitor product and has been used for a long time. In consumer electronics, industrial frequency conversion and other fields, and become a new demand growth point in the field of new energy. With social development and scientific and technological progress, the demand for miniaturization, integration, and portability of electronic equipment products is becoming more and more urgent, and the volume of aluminum electrolytic capaci...

Claims

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Application Information

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IPC IPC(8): C25D11/16C25D11/08C25D11/12
CPCC25D11/08C25D11/12C25D11/16
Inventor 蒋海波范超彭先华
Owner YIDU DONGYANGGUANG FORMED FOIL
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