| abstract |
Disclosed is a solid electrolytic capacitor having a structure in which a dielectric oxide film is hardly damaged on an anode body by mechanical stress, a leakage current is small, and a short circuit failure is suppressed, and a method for manufacturing the same. A solid electrolytic capacitor of the present invention includes an aluminum anode body having a dielectric oxide film of amorphous alumina formed on the surface, and the anode body has a plurality of tunnel-like etching pits. It is formed. The method for producing a solid electrolytic capacitor of the present invention includes a step of forming a plurality of tunnel-like etching pits in an aluminum material, a step of anodic oxidation by dipping the aluminum material in an electrolytic solution containing an acid such as oxalic acid, A step in which an aluminum material is immersed in an electrolytic solution containing an inorganic acid such as an acid or a salt thereof, or an organic acid such as adipic acid or a salt thereof, and anodized at a voltage three times or more of the rated voltage. . [Selection] Figure 3 |