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Fabrication of a plasma electrolytic oxidation/anodic aluminum oxide multi-layer film via one-step anodizing aluminum in ammonium carbonate

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Title: Fabrication of a plasma electrolytic oxidation/anodic aluminum oxide multi-layer film via one-step anodizing aluminum in ammonium carbonate
Authors: Kikuchi, Tatsuya Browse this author →KAKEN DB
Taniguchi, Taiki Browse this author
Suzuki, Ryosuke O. Browse this author →KAKEN DB
Natsui, Shungo Browse this author →KAKEN DB
Keywords: Anodizing
Aluminum
Ammonium Carbonate
Plasma Electrolytic Oxidation
Anodic Aluminum Oxide
Issue Date: 1-Mar-2020
Publisher: Elsevier
Journal Title: Thin solid films
Volume: 697
Start Page: 137799
Publisher DOI: 10.1016/j.tsf.2020.137799
Abstract: A plasma electrolytic oxidation (PEO)/anodic aluminum oxide (AAO) multi-layer film was fabricated via onestep galvanostatic anodizing of high-purity aluminum in 0.3-2.0 M ammonium carbonate ((NH (4))(2)CO3) solutions at 283-333 K and 25-400 Am-2. Anodizing at higher concentrations and higher temperatures caused the formation of relatively uniform anodic oxide film on the aluminum substrate. Characteristic voltage-time curves with two high-plateau voltages at approximately 250 V and 375 V were obtained during galvanostatic anodizing. A mull-layer structure of an outer PEO layer with a crystalline gamma-Al2O3 structure and an inner amorphous AAO layer with nano-cylinerical pores was formed by continuous visible sparking occurring after passing the first voltage plateau region. The whole aluminum surface was covered with the multi-layer structure after reaching the second voltage region. The thickness of the mull-layer increased with time via the further anodizing process at the second plateau voltage. Pore sealing of the inner nanoporous film was achieved by immersion post-treatment in boiling water.
Rights: © <2020>. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
http://creativecommons.org/licenses/by-nc-nd/4.0/
Type: article (author version)
URI: http://hdl.handle.net/2115/84210
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)

Submitter: 菊地 竜也

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