Aluminum foil for capacitor anode and production method

Abstract

The invention discloses an aluminum foil for a capacitor anode and a production method, relating to a metallurgical technology and belonging to the production technical category of aluminum plates, aluminum strips and aluminum foils. The invention particularly relates to manufacture of the aluminum foil, in particular to manufacture of the aluminum foil for a low voltage electrolytic capacitor anode by using a cast-rolling method. In the invention, excessive dissolution can not be generated, corrosion pits are uniformly generated with high density and the face expansion ratio is increased in the process of electrochemical corrosion by controlling the purity of Al and the content of each element i.e. Cu, Fe, Si, Mg, B, Ti, Ni, Zn, Cr and V, thereby increasing the electrostatic capacity after corrosion; and cold rolling plates with uniform components and uniform tissue structures can be directly provided by adopting the cast-rolling method, thereby saving the necessary component uniformization and soaking treatment before a conventional hot rolling method, shortening a production procedure, lowering the energy consumption and enhancing the finished product rate, therefore, the prepared aluminum foil can satisfy the performance requirement of the low voltage electrolytic capacitor anode and can also save the energy for subsequent corrosion processing.

Description

[0001] technical field [0002] The invention relates to metallurgical technology, and belongs to the production technology category of aluminum plates, strips and foils, in particular to the manufacture of aluminum foils, and more specifically to the manufacture of aluminum foils for anodes of low-voltage electrolytic capacitors by casting and rolling. [0003] Background technique [0004] With the development of electronic industry technology and the expansion of application fields, especially the miniaturization of the whole machine, new requirements are put forward for the electrostatic capacity and manufacturing cost of the low-voltage capacitors, such as large electrostatic capacity and low cost. In terms of meeting this demand, aluminum foil materials for capacitor anodes play a leading role. Nowadays, semi-continuous ingot casting, which is usually used, has gradually matured to produce aluminum foil with high specific capacitance through homogenization annealing, ...

AI Technical Summary

Problems solved by technology

Nowadays, semi-continuous ingot casting, which is usually used, has gradually matured to produce aluminum foil with high specific capacitance through homogenization annealing, hot rolling, cold rolling, and foil rolling. However, due to many processes, high energy consumption, low efficiency and low yield , and cannot fully meet the requirements of miniaturization of electrolytic capacitors

However, direct casting and rolling of the melted aluminum alloy into strips, after homogenization treatment, cold rolling and foil rolling can reduce the process and save energy. However, no relevant patents and literatures have been disclosed so far.

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