Method for preparing high-voltage corrosion foil by using electroless reaming

Abstract

The invention discloses a method for preparing a high-voltage corrosion foil through electroless reaming, and belongs to the technical field of aluminum electrolytic capacitors. The method comprises the steps of pretreatment, hole forming treatment, intermediate treatment, first-stage hole expanding treatment, second-stage hole expanding treatment and aftertreatment. A two-section electroless reaming method is adopted, denudation of the surface of the aluminum foil can be weakened through lauric acid polyethylene glycol ester in reaming of the first section, and effective growth of the interiors of holes of the aluminum foil is guaranteed by adjusting the adding amount of the lauric acid polyethylene glycol ester; and in the second section of reaming, by adjusting the adding amount of glycollic acid, aluminum foil surface denudation is weakened, and too fast growth in aluminum foil holes is slowed down. The uniformity of holes of the etched foil in the reaming process is improved through two-section non-electric reaming, and the specific volume of non-electric reaming is increased. The hole growth of the medium-high voltage corrosion foil prepared by the invention is orderly and controllable, and the 520V capacity of the high voltage corrosion foil is 0.900-0.920 [mu] F / cm < 2 >.

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