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High-conversion-rate formed liquid, formed foil and forming method thereof

A chemical conversion method and chemical liquid technology, applied in electrolytic coatings, surface reaction electrolytic coatings, electrolytic capacitors, etc., can solve the problems of low electrostatic capacity conversion rate, low bending conversion rate, etc. The effect of increasing the conversion rate

Active Publication Date: 2015-04-08
SICHUAN RIKE ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing method, boric acid plus ammonia water is often used as the chemical solution, and the conversion rate of the electrostatic capacity of the finished product is low. Taking the product of 560VF as an example, it is about 95-100%, and the bending conversion rate is also low, only 1.5-2 times.

Method used

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  • High-conversion-rate formed liquid, formed foil and forming method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The aluminum foil is sequentially subjected to A) first-level chemical formation, second-level chemical formation, third-level chemical formation, and fourth-level chemical formation; B) phosphoric acid treatment; C) heat treatment; D) post-chemical formation; E) post-treatment; treatment process parameters such as temperature , pressure, time, voltage, etc. are all parameters of conventional chemical formation methods; where:

[0039] The chemical conversion liquid used in the first-stage chemical conversion includes the following raw materials in weight percentage: 0.35% ammonium adipate, 0.20% citric acid, 0.003% maleic acid, 0.003% sodium hypophosphite, and the rest is water;

[0040] The chemical conversion liquid used in the second stage chemical conversion includes the following raw materials in weight percentage: 0.18% ammonium adipate, 0.15% citric acid, 0.002% maleic acid, 0.002% sodium hypophosphite, and the rest are water;

[0041] The chemical conversion li...

Embodiment 2

[0048] The method of formation is the same as the method in Example 1, except that the third-level formation and the fourth-level formation are used for the formation liquid:

[0049] The chemical conversion liquid used in the third-stage chemical conversion includes the following raw materials in weight percentage: 0.65% ammonium pentaborate, 0.015% azelaic acid, 0.030% citric acid, and the rest is water;

[0050] The chemical conversion liquid used in the fourth-stage chemical conversion includes the following raw materials in weight percentage: 0.65% of ammonium pentaborate, 0.005% of azelaic acid, 0.025% of citric acid, and the rest is water.

[0051] The electrostatic capacity conversion rate of the obtained formed foil is 102.50%, and the bending conversion ratio is 2.59 times.

Embodiment 3

[0053] The method of formation is the same as the method in Example 1, except that the third-level formation and the fourth-level formation are used for the formation liquid:

[0054] The chemical conversion liquid used in the third-stage chemical conversion includes the following raw materials in weight percentage: 0.65% ammonium pentaborate, 0.020% azelaic acid, 0.030% citric acid, and the rest is water;

[0055] The chemical conversion liquid used in the fourth-stage chemical conversion includes the following raw materials in weight percentage: 0.65% of ammonium pentaborate, 0.005% of azelaic acid, 0.025% of citric acid, and the rest is water.

[0056] The electrostatic capacity conversion rate of the obtained formed foil is 103.20%, and the bending conversion rate is 2.55 times.

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Abstract

The invention belongs to the field of electronic processing, and specifically relates to a high-conversion-rate formed liquid, a formed foil and a forming method thereof. The technical problem to be solved is to provide a formed liquid having high forming efficiency and capable of enhancing electrostatic capacity and flex conversion rate. The formed liquid comprises the following raw materials by weight percent: 0.55% to 0.85% of ammonium pentaborate, 0.005% to 0.025% of azelaic acid, 0.01% to 0.04% of citric acid and the balance of water. The formed liquid and a formed foil product prepared by the forming method have enhanced electrostatic capacity conversion rate and flex conversion rate, so that the volume of a capacitor can be shortened under the same production capacity condition, and thus the heat released by the capacitor in work is reduced, the power consumption is reduced, and the occupied space of an electric appliance can be reduced. According to the high-conversion-rate formed liquid, the formed foil and the forming method thereof provided by the invention, the technical scheme is simple and easy to implement, the field process flow is convenient to improve, the feasibility is strong, the application prospect is wide, and a brand-new choice is provided for the public.

Description

technical field [0001] The invention belongs to the field of electronic processing, and in particular relates to a high conversion rate forming liquid, a forming foil and a forming method thereof. Background technique [0002] Formed foil is mainly used in aluminum electrolytic capacitors. The formation process is to form a dense oxide film on the surface of high-purity aluminum as a non-conductive medium. The chemical conversion process generally includes the following steps: A) four-level chemical conversion or five-level chemical conversion, B) heat treatment, C) phosphoric acid treatment, D) post-chemical conversion, E) post-treatment, four-level chemical conversion includes first-level chemical conversion, second-level chemical conversion, The third-level formation, the fourth-level formation, and the fifth-level formation include the fifth-level formation in addition to the above-mentioned fourth-level formation. Through the above process steps, aluminum and the chem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/10C25D11/12H01G9/055
Inventor 李铁军涂长新蔡斌韩苏额沈向前施忠裕
Owner SICHUAN RIKE ELECTRONICS
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