Novel graphite resistor rod for aluminum foil corrosion of capacitor

Abstract

The invention belongs to the technical field of graphite electrodes, in particular to a graphite electrode used by an aluminum electrolytic capacitor for electrochemical corrosion. The graphite electrode consists of a graphite polar plate, an insulated baffle plate and two copper bars. One end of each copper bar is inserted into the graphite polar plate and the other end of each cooper plate is connected with a power wire. The insulated baffle plate is fixed with the graphite polar plate through a graphite bolt and a non-through screw hole. Compared with the graphite electrode in the prior art, the graphite electrode has the advantages that the current in the electrode is uniformly distributed, lateral deviation of electrode foil is obviously lowered, and the self-corrosion of the electrode foil can not become more serious due to prevention of production of other metal elements that can pollute liquid in an etch bath.

Description

Technical field: [0001] The invention belongs to the technical field of graphite electrodes, in particular to a graphite electrode for electrochemical corrosion of aluminum electrolytic capacitors. Background technique: [0002] The electrodes of aluminum electrolytic capacitors are generally made of high-purity aluminum. The capacitance of the capacitor is proportional to the surface area of ​​the anode aluminum foil for the capacitor. The larger the surface area of ​​the anode aluminum foil, the greater the capacitance of the aluminum electrolytic capacitor. In this case, the less anode foil material used in the capacitor, the smaller the corresponding capacitor volume. In order to increase the surface area of ​​the anode aluminum foil, the usual method is to electrochemically corrode the aluminum foil to form a large number of small holes, thereby expanding the real surface area of ​​the aluminum foil. [0003] In the actual production of anode foil, a linkage production...

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Problems solved by technology

[0003] In the actual production of anode foil, a linkage production device is used, the aluminum foil is soaked in the corrosion bath, and a certain AC or DC is applied to corrode and expand the surface. The traditional graphite electrode for electrochemical corrosion is a single-piece graphite electrode, that is, a whole graphite Graphite electrodes made of graphite plates. Due to the large resistance of graphite and low corrosion voltage in production, the corrosion current density is unevenly distributed laterally. Small, due to uneven current distribution, it seriously affects the quality of anode aluminum foil

[0004] Chinese patent 00223665.6 discloses a new type of graphite composite electrode, which is composed of electrode layer graphite, auxiliary conductive layer graphite and an insulating spacer layer between the two. This structure can make the corrosion current density evenly distributed in the depth direction of the electrolyte. That is, the distribution is uniform in the longitudinal direction, but there is still a large deviation in the corrosion current density in the transverse direction

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