A five-stage phosphate formation process

A phosphate and process technology, applied in the direction of capacitors, circuits, electrical components, etc., can solve the problems of capacity loss, failure to meet demand, and limited improvement, and achieve the effects of no capacity loss, reduced leakage current, and weakened deterioration

Active Publication Date: 2021-10-08
石河子众金电极箔有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, by introducing dicarboxylic acid before pure inorganic formation, phosphate can be added to the primary and secondary forming solutions. Although it can improve the hydration resistance of the anode foil and reduce the leakage current, the degree of improvement is limited and the capacity loss is serious. , unable to meet the higher demand of the market

Method used

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  • A five-stage phosphate formation process
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  • A five-stage phosphate formation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] The specific operation steps are as follows:

[0062] (1) Boiling in high temperature water: immerse in water above 95°C for 11 minutes.

[0063] (2) One-stage formation: anodic oxidation with an aqueous solution of 1g / L ammonium dihydrogen phosphate, 2g / L citric acid and 2g / L triammonium citrate, the treatment time is 8min, the treatment temperature is 90°C, and the formation is to 120V .

[0064] (3) Secondary formation: anodic oxidation with an aqueous solution of 1g / L citric acid and 2g / L triammonium citrate, the treatment time is 8min, the treatment temperature is 90°C, and the formation is up to 250V.

[0065] (4) Tertiary formation: use an aqueous solution with a concentration of 0.5g / L citric acid and 1g / L triammonium citrate for anodic oxidation, the treatment time is 8min, the treatment temperature is 90°C, and the formation is up to 380V.

[0066] (5) Four-stage chemical conversion: use an aqueous solution with a concentration of 0.2g / L citric acid and 0.6g...

Embodiment 2

[0078] The specific operation steps are the same as in Example 1, except that 1 g / L of ammonium dihydrogen phosphate is added to the secondary forming solution. The difference is that the formation voltage (that is, the five-level formation voltage and repair voltage) is 555V.

[0079] Anodized under the condition of forming voltage of 555V, using Example 2, slight corrosion occurs on the foil edge, and the capacity of the foil is 0.848μF / cm 2 , the withstand voltage value is 534V, the boost time after 1h boiling is 22s, and the leakage current is 0.3mA for 1h. Slight corrosion on foil edge.

Embodiment 3

[0081] The specific operation steps are the same as in Example 1, except that 1 g / L ammonium dihydrogen phosphate is added to the secondary forming solution, and 0.5 g / L ammonium dihydrogen phosphate is added to the tertiary forming solution. The difference is that the formation voltage (that is, the five-level formation voltage and repair voltage) is 558V.

[0082] Anodized at a formation voltage of 558V, the foil capacity is 0.847μF / cm 2 , the withstand voltage value is 534V, the boost time after 1h boiling is 22s, and the leakage current is 0.29mA for 1h. The lack of edges in the formed foil is more obvious.

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Abstract

The invention is a five-stage phosphate formation process. A five-stage phosphate formation process, comprising: (1) high-temperature water boiling; (2) pretreatment; (3) one-stage formation; (4) two-stage formation; (5) three-stage formation; (6) four-stage formation (7) five-stage chemical formation; (8) primary burning; (9) primary repair; (10) middle processing; (11) secondary repair; (12) secondary burning; (13) triple repair Processing; (14) Post-processing; (15) Drying. The invention provides a five-stage phosphate formation process, which introduces phosphate in the first to fifth-stage formations, and adds a pretreatment process before the first-stage formation, which has the advantages of strong hydration resistance and low leakage current.

Description

technical field [0001] The invention belongs to the technical field of aluminum electrolytic capacitor anode foil, and in particular relates to a five-stage phosphate formation process. Background technique [0002] With the development of aluminum electrolytic capacitors, not only the capacity of the anode foil is required to be high, but also its service life is required to be higher and higher. The traditional chemical formation process generally adopts boric acid-based or organic acid-based pre-formation, followed by heat treatment, boric acid primary repair, phosphoric acid depolarization treatment, boric acid secondary repair, heat treatment, boric acid third repair, post-treatment and drying process. In order to increase the service life of the product, some manufacturers introduce phosphate in the front-end formation, which can reduce the leakage current of the anode foil and improve the hydration resistance, so as to achieve the purpose of improving the service life...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/04H01G9/055
CPCH01G9/04H01G9/055
Inventor 林颖黄予涵王江波祝进力李宏亮王兰东杨文峰陈小元
Owner 石河子众金电极箔有限公司
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