Electrochemical Etching of Aluminum Foil for Electrolytic Capacitors

C.-S. Chi; Y. Jeong; S.S. Kim; J.H. Lee; H.J. Oh

doi:10.4028/www.scientific.net/MSF.475-479.385

Paper Titles

Dilute Alloy Designs of 7xxx Aluminum Alloys for Thick Forging Applications
p.369

Deformation Behaviors of 6061 and 7075 Aluminum Tubes at Elevated Temperatures for Warm Hydroforming
p.373

Development of Horizontal Reheating System for Semi-Solid Die Casting and Its Microstructure Evaluation
p.377

Effect of Be Addition on the Precipitation Behaviors and Mechanical Properties in Al-Cu-Li-Mg-Zr-(Ag) Alloys
p.381

Electrochemical Etching of Aluminum Foil for Electrolytic Capacitors
p.385

Evolution of Annealing Textures and Microstructures in AA 3103 after Cold Rolling and Repeated Shear Deformation
p.389

High Temperature Deformation Behavior of Pre-Sintered Al-10Si-5Fe Based Alloy
p.393

Microstructural Characterization of Rheology Material Fabricated by Rotational Barrel Type
p.397

Sliding Wear Characteristics of Ultrafine-Grained Non-Strain-Hardening Aluminum-Magnesium Alloys
p.401

HomeMaterials Science ForumMaterials Science Forum Vols. 475-479Electrochemical Etching of Aluminum Foil for...

Electrochemical Etching of Aluminum Foil for Electrolytic Capacitors

Abstract:

The increase of capacitance on dielectric layer is associated with enlargement of etched surface area of electrodes for aluminum electrolytic capacitors. Etched tunnels extending along [100] directions are formed by crystallographic dissolution of aluminum in a chloride solution. This study has been focused primarily on the effects of addition of inhibitors to hydrochloric acid solution on the increase of the surface area by Electrochemical Impedance Spectroscopy (EIS). The addition of 3 % ethylene glycol was more effective for the enlargement of the surface area comparing with those of 1M sulfuric acid and no additive. And it was observed by TEM that the tunnels were grown straight and parallel to [100] directions.