Preparation process of high-voltage anode foil for contracted ox horn type aluminum electrolytic capacitor

An aluminum electrolytic capacitor and its preparation technology, applied in electrolytic capacitors, capacitors, circuits, etc., can solve the problems of large leakage current, low anode foil capacity, and poor mechanical strength, and achieve easy control, high electrostatic capacity, and excellent surface performance Effect

Active Publication Date: 2020-08-28
XINJIANG JOINWORLD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a preparation process of high-voltage anode foil for shrinkage horn-shaped aluminum electrolytic capacitors, which mainly aims at the problems of low anode foil capacity, poor mechanical strength, and large leakage current, and can produce high-performance anode foil for the market. The multiple advantages of high specific volume, high bending, and low leakage can meet the requirements of shrinking horn-type aluminum electrolytic capacitor products

Method used

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  • Preparation process of high-voltage anode foil for contracted ox horn type aluminum electrolytic capacitor
  • Preparation process of high-voltage anode foil for contracted ox horn type aluminum electrolytic capacitor
  • Preparation process of high-voltage anode foil for contracted ox horn type aluminum electrolytic capacitor

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Experimental program
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Effect test

Embodiment 1

[0088] The specific operation steps are as follows:

[0089] (1) Primary feed: the conductive silver roller supplies power to the primary and secondary forming feeds.

[0090] (2) Boiling in high temperature water: Soak the foil in water above 97°C for 12 minutes.

[0091] (3) One-stage chemical conversion: use a forming solution containing 1 g / L ammonium dihydrogen phosphate, 0.5 g / L citric acid, and 0.5 g / L triammonium citrate to perform primary chemical conversion. Current density 80mA / cm 2 , the voltage is 170V, the formation time is 9min, and the processing temperature is 90°C.

[0092] (4) Secondary chemical conversion: perform secondary chemical conversion with a forming solution containing 0.5 g / L ammonium dihydrogen phosphate, 0.7 g / L citric acid and 0.7 g / L triammonium citrate. Current density 80mA / cm 2 , the voltage is 340V, the formation time is 9min, and the processing temperature is 90°C.

[0093] (5) Tertiary chemical conversion: use a forming solution cont...

Embodiment 2

[0108] Embodiment 2: The preparation process is the same as in Embodiment 1, the difference is that the first stage forming liquid:

[0109] Primary chemical conversion: use a forming solution containing 2 g / L ammonium dihydrogen phosphate, 0.5 g / L citric acid and 0.5 g / L triammonium citrate to perform primary chemical conversion. Current density 80mA / cm 2 , the voltage is 170V, the formation time is 9min, and the processing temperature is 90°C.

[0110] Under the condition of anodizing at 670V voltage, the foil capacity is 0.633μF / cm 2 , the withstand voltage value is 664V, the bending time is 62 times, and the boost time after 1h boiling is 86s.

Embodiment 3

[0111] Embodiment 3: The preparation process is the same as in Embodiment 1, the difference is that the first stage forming liquid:

[0112] Primary chemical formation: use a forming solution containing 3g / L ammonium dihydrogen phosphate, 0.5g / L citric acid and 0.5g / L triammonium citrate for primary chemical formation, with a current density of 80mA / cm 2 , the voltage is 170V, the formation time is 9min, and the processing temperature is 90°C.

[0113] Under the condition of anodizing at 670V voltage, the foil capacity is 0.631μF / cm 2 , the withstand voltage value is 664V, the bending time is 64 times, and the boost time after 1h boiling is 94s.

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Abstract

The invention relates to a preparation process of a high-voltage anode foil for a contracted ox horn type aluminum electrolytic capacitor. The preparation process comprises the following steps: (1) first-stage feeding; (2) high-temperature water boiling of an aluminum foil sheet; (3) first-stage formation; (4) second-stage formation; (5) second-stage feeding; (6) third-stage formation; (7) fourth-stage formation; (8) third-level feeding; (9) five-stage formation; (10) six-stage formation; (11) first phosphoric acid treatment; (12) first rear end repairing; (13) second phosphoric acid treatment; (14) second rear end repairing; (15) sheet firing; (16) third rear end repairing; (17) post-treatment; and (18) drying treatment. According to the preparation process of the high-voltage anode foilfor the contracted ox horn type aluminum electrolytic capacitor, the aluminum foil with high capacity, high strength, low electric leakage and high hydration resistance can be prepared.

Description

technical field [0001] The invention belongs to the technical field of electrolytic capacitors, and in particular relates to a preparation process of a high-voltage anode foil for a shrinking horn-type aluminum electrolytic capacitor. Background technique [0002] Electrode foil is an essential raw material for the manufacture of aluminum electrolytic capacitors. Due to the development of aluminum electrolytic capacitors towards miniaturization, high performance, and chip type, the manufacturing industry of electrode foil has higher requirements for capacity, mechanical properties and stability of oxide film. [0003] At present, most of the corroded foils use boric acid system or organic acid system to generate Al on the foil surface. 2 o 3 The oxide film is used as a dielectric and made into chemical foil. The more common technical solutions are as follows: [0004] At present, the formation process of high-voltage anode foil for electrolytic capacitors mainly adopts t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/045H01G9/055
CPCH01G9/045H01G9/055
Inventor 林颖黄予涵游彭飞王江波王兰东祝进力李宏亮杨文峰陈小元
Owner XINJIANG JOINWORLD CO LTD
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