Frequency conversion bore distribution method for low-voltage anodic foil for aluminum electrolytic capacitor

Abstract

A method for conversing frequency and distributing holes used in low voltage anode foil of aluminum electrolytic capacitors relates to aluminum electrolytic capacitors, in particular relates to a method which can realize conversing frequency and distributing holes used in low voltage anode foil of the aluminum electrolytic capacitors with high specific volume aluminum electrolytic capacitors and provides a method for conversing frequency and distributing holes used in low voltage anode foil of aluminum electrolytic capacitors, wherein the method comprises the following steps: carrying out conventional oil removal to the aluminum foil, cleaning, and then carrying out hole distribution electrolysis to the aluminum foil, wherein the electrolyte is provided with 0.8-3.8N hydrochloric acid, 0.01-0.5N vitriol oil and 0.1-1.2N alchlor, frequency of the simple-sinusoidal alternating current which is adopted by the electrolysis is 5-80Hz, current density is 0.20-0.37A / cm2, obtaining the etched foil after carrying out conventional hole enlarging, obtaining the aluminum electrolytic capacitors used in low voltage anode foil after carrying out the conventional forming to the etched foil.

Description

technical field [0001] The invention relates to an aluminum electrolytic capacitor, in particular to a frequency-conversion hole layout method for a low-voltage anode foil for an aluminum electrolytic capacitor that can realize high specific volume of the low-voltage aluminum foil for the aluminum electrolytic capacitor. Background technique [0002] Since the Germans manufactured the world's first high-purity aluminum foil electrolytic capacitor in 1938, aluminum electrolytic capacitors have gradually become one of the most widely used electronic components due to their high specific volume, self-healing properties of the oxide film, and low price. one. At present, the common manufacturing process in the world is to use electrochemical corrosion to increase the effective surface area of ​​aluminum foil to increase the specific volume. However, with the development of electronic products in the direction of lightness, thinness, shortness and smallness, the requirements for ...

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Problems solved by technology

There is a large amount of Cl in the highly corrosive and high-concentration electrolyte - , and there are a large number of defects on the surface of low-purity electronic aluminum foil, which is very easy to adsorb Cl - , in the early stage of corrosion, more initial pits are formed, the inhomogeneity of the surface defects of the aluminum foil and the physical and chemical properties that are easy to be broken lead to most of the pits being concentrated in the defects, and the density of the pits on the surface is very uneven, and due to If the pore density in the local area is too high, the pores will merge to form large pores. With the subsequent corrosion, the surface of the aluminum foil will dissolve, the powder will be thinned, and the specific volume will be reduced; while there is a small amount of attack ion Cl in the low-acidity electrolyte. - , high-purity electronic aluminum foil has fewer surface defects, so there are fewer corrosion pits during corrosion, the hole density is lower, the area of ​​​​pores is greatly reduced, and uniform corrosion is difficult

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