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Self-Ordering of Porous Anodic Alumina Fabricated by Anodizing in Chromic Acid at High Temperature
- Source :
- Journal of The Electrochemical Society. 168:093501
- Publication Year :
- 2021
- Publisher :
- The Electrochemical Society, 2021.
-
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.
- Subjects :
- Materials science
Renewable Energy, Sustainability and the Environment
Anodizing
Condensed Matter Physics
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
Anode
chemistry.chemical_compound
Chemical engineering
chemistry
Materials Chemistry
Electrochemistry
Chromic acid
Porosity
Self ordering
Subjects
Details
- ISSN :
- 19457111 and 00134651
- Volume :
- 168
- Database :
- OpenAIRE
- Journal :
- Journal of The Electrochemical Society
- Accession number :
- edsair.doi.dedup.....5e2c15dcb5d676fc02c5b27222bc5ce3
- Full Text :
- https://doi.org/10.1149/1945-7111/ac2101