On the etching process of aluminum foil for high-voltage electrolytic capacitors

Electrochemical method and orthogonal design were used to study influencing factors of surface anode corrosion foil. Corresponding factors were investigated such as concentration of etching solution, current density, temperature, and corrosion time which affect on performance of aluminum foil in the system of sulfuric acid and hydrochloric acid. The optimal corrosion conditions were chosen through orthogonal test that corrosion temperature is 70 ℃,Ψ （HCl∶H₂SO₄）=1∶3, current density is 0.25 A/cm² , and corrosion time is 105 sec, et al. The results show that: corrosion foil of high specific volume can be got and specific electric-capacity is as high as 110.8 μf·cm^-2. This study can provide scientific basis for the follow-up corrosion research of aluminum foil.