Production method of aluminium foil for electrode of electrolytic capacitor

Abstract

The invention relates to a production method of an aluminium foil for an electrode of an electrolytic capacitor, specifically comprising the steps of the smelting and the casting of an aluminium plate, an aluminium tape and the aluminium foil, pressure processing and heat treatment. The production method of the aluminium foil for the electrode of the electrolytic capacitor comprises the following steps of: preparing an aluminium alloy melting solution, and filtering the prepared aluminium alloy melting solution; directly inputting the filtered aluminium alloy melting solution to a casting machine, and casting into a coiled sheet with certain thickness; carrying out cold rolling on the casting coiled sheet; carrying out intermediate annealing; continuously carrying out the cold rolling to rolling to a preset thickness; carrying out the intermediate annealing; rolling the aluminium foil to a preset product thickness; and removing oil and the like. The invention directly provides cold rolling plates with uniform components and organization structures and saves the step of the component uniformization and uniformization treatment which is needed before a conventional hot rolling method is carried out, thereby shortening the production process, lowering the energy consumption and enhancing the plate yield; and in addition, the manufactured aluminium foil can not only meet the property requirement of an anode of a medium-voltage electrolytic capacitor, but also save the energy for subsequent corrosion processing.

Description

technical field [0001] The invention relates to a production method of aluminum foil for electrodes of electrolytic capacitors, more specifically, including melting and casting of aluminum plates, strips and foils, pressure processing and heat treatment. Background technique [0002] With the rapid development of industries such as electronics, electrical appliances and automobiles, higher and higher requirements are put forward for the miniaturization and integration of complete equipment. While the demand for large-capacity electrolytic capacitors has increased significantly, the performance and volume of electrolytic capacitors have also put forward higher and higher requirements. In these aspects, aluminum foil for electrolytic capacitor electrodes plays a decisive role. In the method of producing aluminum foil for electrodes of electrolytic capacitors, it is known to use the ingot hot rolling process. For example, the production process disclosed in ZL01131402.8 "Prod...

AI Technical Summary

Problems solved by technology

In the disclosed process method, high-speed cooling water flow is used to cool the ingot, and the ingot is preheated and homogenized before hot rolling. On the one hand, it leads to a large amount of energy consumption. The consistency of composition and the stability of aluminum foil quality cannot be guaranteed, resulting in unstable quality of corroded aluminum foil electrodes; the Chinese patent ZL01815777.7 "Aluminum Materials for Electrolytic Capacitor Electrodes and Electrolytic Capacitors" was authorized and published on August 16, 2006 The manufacturing method of aluminum foil for electrodes, and the best embodiment of electrolytic capacitors" discloses that when manufacturing foil, a small hinged mold is used to make an ingot with a predetermined composition, and then surface processing, hot rolling, cold rolling, and intermediate annealing , Intermediate annealing and then rolling into foil, degreasing and washing, final annealing in inert gas

The process used is complicated, and the ingot needs to be heated and homogenized before hot rolling, which requires high energy consumption; and in order to ensure that the composition is as uniform as possible and easy to roll, the surface of the ingot needs to be processed, resulting in a low yield; in 2008 In the flow chart and implementation disclosed in the patent application 200710142166.7 "Aluminum Foil for Electrolytic Capacitor Electrodes" published on April 16, 2007, the alloy ingot is preferably subjected to homogenization treatment and soaking treatment, followed by hot rolling and cold rolling, and requires intermediate annealing

Using the above-mentioned known hot rolling process, before hot rolling, it is necessary to undergo homogenization and / or soaking treatment to solve the problems of composition segregation during ingot casting and the temperature required for hot rolling, and at the same time Deal with the uneven surface of the ingot, which leads to long process flow, high energy consumption, and low yield, which leads to high cost of aluminum foil materials

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