The Study of Porous Anodic Alumina as Template for the Pit Initiation on Electrode Aluminum Foils

Abstract:

To obtain a large surface area, the aluminum electrode foils (AEF) were etched by direct current (DC) in hot chloride solution to get lots of vertical [001] tunnels. Whereas, because of the defects as rolling trace, distorted oxidation film, non-uniform organization, pollution layer on the surface of the aluminum foil, and the easy corrosion in hot Cl- acid solution, the etch pits are disorder and merged. These merged pits cause laterally directed dissolution and excessive dissolution on the aluminum surface, which limited the surface enlarging and decreased the strength of the aluminum foils. In this paper, we adopted anodic oxidation to fabricate the porous anodic alumina (PAA) on the high-purity electronic aluminum foils with 99.99% purity, and polarized by a negative voltage in the KCl solution. The result showed that several nanopores combined together to form a large open holes without barrier layers. With this membrane on, the foils were etched in 70°C HCl+H2SO4 solution, and the etch pits were just generated in the combining-nanopores. The etch pits grew into tunnels respectively without merged, and the surface was also smooth.

• Periodical: Key Engineering Materials (Volumes 562-565)
• Pages: 947-951
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.562-565.947
• Online since: July 2013
• Authors: Hong Mei Zheng, Yu Cheng Wu, Xin Min Huang, X. Shu, Yu Chun Zheng, M.C. Liu
• Keywords: Aluminum Electrolytic Capacitors, Electrode Aluminum Foils, Etch Tunnel, Porous Anodic Alumina

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