Highly increased breakdown potential of anodic films on aluminum using a sealed porous layer

• Cao, Jin-Hui

• Sato, Yuki

• Kowalski, Damian

• Zhu, Chunyu

• Aoki, Yoshitaka

• Cheng, Yingliang

• Habazaki, Hiroki

抄録

The growth of a uniform barrier-type anodic film on aluminum is usually terminated by electric breakdown, which is controlled by the resistance of electrolyte or anion concentration. In this study, highly resistive porous layers have been introduced by anodizing aluminum in sulfuric acid electrolyte followed by boiling water treatment to examine their influence on the electric breakdown potential. The pores of the porous alumina film are sealed by forming hydrated alumina (pseudo-boehmite) after the boiling water treatment. The breakdown potential increases to over 1500 V for the pore-sealed aluminum specimens on anodizing in sodium tungstate electrolyte. The electrochemical impedance spectroscopy measurements revealed an increased resistance of the porous layer after the pore-sealing treatment. GDOES depth profile analysis disclosed that the sealed porous layer impedes the incorporation of tungsten species into the barrier layer. The introduction of a highly resistive layer that also suppresses the anion incorporation on aluminum is effective in increasing the breakdown potential of anodic films.

収録刊行物

• Journal of Solid State Electrochemistry

  Journal of Solid State Electrochemistry 22 (7), 2073-2081, 2018-07

  Springer

キーワード

• Anodizing
• Aluminum
• Anodic film
• Pore sealing
• Electric breakdown

詳細情報

• CRID: 1050282677781448704
• NII論文ID: 120006649178
• DOI: 10.1007/s10008-018-3913-3
• ISSN: 14330768
• ISSN: 14328488
• HANDLE: 2115/74832
• Web Site: http://link.springer.com/article/10.1007/s10008-018-3913-3/fulltext.html
• Web Site: http://link.springer.com/content/pdf/10.1007/s10008-018-3913-3.pdf
• 本文言語コード: en
• 資料種別: journal article
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