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Self-Ordering of Porous Anodic Alumina Fabricated by Anodizing in Chromic Acid at High Temperature
| Title: | Self-Ordering of Porous Anodic Alumina Fabricated by Anodizing in Chromic Acid at High Temperature |
| Authors: | Kikuchi, Tatsuya Browse this author →KAKEN DB | | Yamashita, Motoki Browse this author | | Iwai, Mana Browse this author | | Suzuki, Ryosuke O. Browse this author |
| Issue Date: | 1-Sep-2021 |
| Publisher: | The Electrochemical Society (ECS) |
| Journal Title: | Journal of the electrochemical society |
| Volume: | 168 |
| Issue: | 9 |
| Start Page: | 093501 |
| Publisher DOI: | 10.1149/1945-7111/ac2101 |
| Abstract: | Anodizing Al in chromic acid is a very useful surface finishing process for corrosion protection and nanoscale porous structure fabrication, whereas the self-ordering of porous anodic alumina (PAA) in chromic acid has never been found to date. Herein, we provide a self-ordered PAA film possessing numerous sub100-nm-scale characteristic bumps through anodizing in chromic acid at high temperature. Anodizing of high purity Al plates in a 0.3 M chromic acid solution at conventional low temperatures, such as 293 K, leads to the formation of a disordered PAA film, whereas anodizing at a high temperature of 348 K causes the self-ordering behavior of the pore structure. The PAA film grown in the initial stage possessed the highest regularity, and it decreased with anodizing time due to pore branching during anodizing. A highly ordered PAA film measuring approximately 340 nm in interpore distance can be fabricated by short-term, two-step anodizing in chromic acid at 348 K and 120 V. The ordered PAA film possesses a characteristic nanostructure consisting of hexagonally arranged 100-nm-scale pores and sub100-nm-scale disordered bumps on their pore walls without any electrolyte chromate anion. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/82793 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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