Comparative research on etched aluminum foils fabricated by different techniques for aluminum electrolytic capacitor

Surface and cross-sectional morphology of etched aluminum foils fabricated by different techniques were observed by metalloscope,voltage-time response of etched aluminum foil during anodizing galvanostatically was followed,and the specific capacitance,leakage current,tensile strength and bending property were measured.The results show that corrosive pore of soft AC-etched aluminum foil presents the shrub form distribution;corrosive pore of DC-AC etched aluminum foil presents the complex distribution of arbor and shrub,some large tunnel-pores distribute into corrosive layer,and the surface area increasing factor is least;Corrosive pore of hard AC-etched aluminum foil presents the sponge structure,and the surface area increasing factor is biggest for close pores.The leakage current through DC-AC etched aluminum foil when anode finishing is least,while the tensile strength and bending property of hard AC-etched aluminum foil are best.