Korean Institute of Surface Engineering

pISSN : 1225-8024 | eISSN : 3399-8403


한국표면공학회지 (26권5호 271-279)

Electorchemical Etching of Anode Foil for Aluminum electorlytic Capacitors

알루미늄 전해 콘덴서용 양극박 전해 에칭


인하대학교 공과대학 금속공학과;
인하대학교 공과대학 금속공학과;


Experiments on electorchemical etching of aluminum foils with high cubic textures were carried out in this study. Etching behaviours and pit shapes with respect to various conditions of eletrochemical etching were in-vestigated. When HCl and NaCl solutions were used as electrolytes, the highest capacitanes were observed in solutions of 1MHCl and 5M NaCl. It was foundd that capacitance was improved by addition of H2SO4 to HCl so-lution which is considered to be due to the suppression of oxide film formation on the aluminum surface. The homogeneous distribution of each pits obtained in the HCl solution, while the degree of weight loss was lowest in the Nacl solution. The best etching properties in 1M HCl solution were obtained at the etching condi-tions of 0.15 A/$ extrm{cm}^2$, 150sec and$ 90^{circ}C$.