Manufacturing method of light edge controllable electrode foil for solid aluminum electrolytic capacitor

Abstract

The invention relates to a method for manufacturing a light edge controllable electrode foil for a solid aluminum electrolytic capacitor. The method comprises the following steps of: performing oil removal operation on the surface of an aluminum foil; performing local coating operation on the aluminum foil; performing curing treatment on the coating layer; performing electrochemical corrosion operation on the aluminum foil; the aluminum foil is placed in pure water to be washed; the aluminum foil is placed in a chemical cleaning solution to be subjected to post-treatment cleaning; and finally carrying out post-processing operation on the aluminum foil. Therefore, on one hand, the electrochemical corrosion process of the aluminum foil has definite directivity and controllability, and it is ensured that the formed corrosion foil has good mechanical strength; and on the other hand, no matter under any electrochemical corrosion condition, the'smooth edge 'on the aluminum foil can be prevented from being corroded, a good foundation is laid for reducing the width of the'smooth edge' as much as possible, the phenomenon that a large amount of aluminum foil raw materials are wasted is effectively eliminated, and the possibility is provided for more thorough corrosion of a non-coating area of the aluminum foil.

Description

technical field [0001] The invention relates to the technical field of electrode foil manufacturing, in particular to a method for manufacturing an electrode foil with controllable smooth edges for solid aluminum electrolytic capacitors. Background technique [0002] In the process of producing aluminum electrode foil, it is necessary to "make holes" on the aluminum foil, that is, to prepare holes on the aluminum foil. Common low-voltage electrode foil hole shapes such as "sponge holes" (such as figure 1 shown). The shape and density of the pores determine the capacity of the aluminum electrode foil after formation (also known as the performance level of the aluminum electrode foil). [0003] In the "punching" process, the light foil (raw material) will generate holes through processes such as energization and acid addition. After multi-stage energization and acid addition processes, the surface of the aluminum foil will be corroded into corrosion holes similar to sponges....

AI Technical Summary

Problems solved by technology

However, this method has defects: because the production process needs to undergo multi-stage galvanic corrosion, other chemical reactions and cleaning procedures need to be carried out between energized levels at all levels; It is kept at the same position during the whole production process, and at the same time, due to the strong ductility of aluminum foil, it is inevitable that there will be left and right deviations during production

The left and right deviation of the corroded foil will make the position of the edge bracket to block the corrosion of the aluminum foil different, which will cause the holes on the edge of the corroded foil to be inconsistent with the middle part, and the quality of the product (also called the degree of tolerance) will vary greatly.

To solve the left-right offset problem of the corroded foil, the design size of the smooth edge needs to be greatly widened, and more edge waste must be removed in the subsequent process, resulting in a large waste of aluminum foil resources

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