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Self-Ordering of Porous Anodic Alumina Fabricated by Anodizing in Chromic Acid at High Temperature

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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
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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