A manufacturing method of multi-stage porous rapid medium and high voltage electrode foil

Abstract

The invention relates to a manufacturing method of a multi-stage frothing quick medium and high-voltage electrode foil. A conventional single-stage constant-current frothing technique is improved into a direct-current multi-stage frothing technique with special waveform, the total processing time of each stage is divided into multiple different processing time periods, connecting points of adjacent time periods are time nodes, the current density is gradually changed along with the change of the processing nodes, multi-stage frothing is favorable for frothing areas which are not frothed again, additionally, the manufacturing method has the advantages of large frothing current density and small current density at a hole growth stage, extracorporeal circulation is added to frothing and chambering so as to be favorable for forming large holes, thereby increasing the capacity of an etched foil, and the manufacturing method is suitable for a high-voltage formed foil.

Description

technical field [0001] The invention relates to a method for manufacturing a multi-stage porous rapid medium-high voltage electrode foil corrosion for aluminum electrolytic capacitors, and belongs to the field of electrode foil corrosion preparation technology. Background technique [0002] With the development of the electronics industry, the demand for electrode foils in communication products, aerospace, home appliances and other fields has increased dramatically. At the same time, the requirements for miniaturization, high performance, and chip type of aluminum electrolytic capacitors are becoming more and more obvious. In order to achieve the above requirements, higher technical and quality requirements are put forward for the electrode foil. Capacity improved. [0003] The electrode foil is prepared by a special corrosion process. The corrosion process uses the electronic light foil as the raw material, and the electronic light foil is etched by chemical or electroche...

AI Technical Summary

Problems solved by technology

[0004] At present, in the domestic existing corrosion foil manufacturing methods, the perforation process is generally single-stage constant current perforation. In the case of single-stage perforation, there is still a large area on the surface of the corroded foil without initial corrosion pits. In order to increase the specific volume of corrosion, It is necessary to increase the corrosion power to increase the initial corrosion hole density. After increasing the corrosion current density under constant current conditions, the current density is too large during the pore growth stage, which will cause the surface of the aluminum foil to dissolve, which is not conducive to the improvement of the specific volume of the aluminum foil.

In the hole expansion stage, pure electrochemical corrosion is basically used. The holes formed by this method are too small, which is not conducive to the preparation of high-voltage formed foils.

At the same time, at present, the internal circulation of the tank body is used for the hole making and reaming tanks, and the temperature and concentration of the tank liquid will be locally uneven, resulting in large lateral dispersion of the aluminum foil.

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