An electrochemical corrosion process for medium and high voltage anode foil production

Abstract

The invention discloses an electrochemical corrosion process for the production of medium and high voltage anode foil, which comprises the following steps: A. Pretreatment: put the aluminum foil into a mixed solution of sodium hydroxide and potassium hydroxide at a temperature of 35-45°C, Soak for 40-60s; B. Pores: Put the pretreated aluminum foil into a mixed solution containing 10-15% hydrochloric acid and 35-45% sulfuric acid by mass at a temperature of 65-75°C to control the corrosion current density 250-400mA / cm2, carry out the hole corrosion for 100-120s; C, expand the hole: wash the aluminum foil after the hole with deionized water, put it into the aluminum foil with a temperature of 80-90°C and a mass percentage of 11-15%. In the nitric acid solution, control the hole expansion current to 50-150mA / cm2, and carry out hole expansion for 9-12 minutes; D, post-treatment; E, drying. The electrochemical corrosion process of the present invention has a simple process and is easy to control the process, and can effectively ensure stable foil surface quality of the produced medium and high voltage anode foil, and has both high specific volume and high strength.

Description

technical field [0001] The invention relates to the technical field of production of medium and high voltage anode foils for aluminum electrolytic capacitors, in particular to an electrochemical corrosion process for the production of medium and high voltage anode foils. Background technique [0002] Due to its simple production, low price, superior performance and reliable quality, aluminum electrolytic capacitors have been widely used in electrical products. Moreover, with the rapid development of the electrical and electrical industries, the production scale and market demand of aluminum electrolytic capacitors are still growing. In order to adapt to the development trend of miniaturization and high performance of electric products, it is necessary to develop capacitors with high specific capacitance. The specific capacitance of an aluminum electrolytic capacitor is proportional to the effective surface area and dielectric constant of its dielectric layer, and inversely ...

AI Technical Summary

Problems solved by technology

[0003] However, the current electrochemical corrosion process for medium and high voltage anode foil production still has the following problems: it is easy to cause unstable foil surface quality of medium and high voltage anode foil due to improper process control; and the true corrosion coefficient of medium and high voltage anode foil Compared with the practical limit corrosion coefficient, there is still a lot of room for improvement, and it is difficult to obtain medium and high voltage anode foils with high specific volume and high strength (high bending times)