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Importance of water content in formation of porous anodic niobium oxide films in hot phosphate-glycerol electrolyte

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Title: Importance of water content in formation of porous anodic niobium oxide films in hot phosphate-glycerol electrolyte
Authors: Habazaki, H. Browse this author →KAKEN DB
Oikawa, Y. Browse this author
Fushimi, K. Browse this author →KAKEN DB
Aoki, Y. Browse this author →KAKEN DB
Shimizu, K. Browse this author
Skeldon, P. Browse this author
Thompson, G.E. Browse this author
Keywords: anodic oxide
niobium
porous oxide
glycerol electrolyte
Issue Date: 1-Jan-2009
Publisher: Elsevier
Journal Title: Electrochimica Acta
Volume: 54
Issue: 3
Start Page: 946
End Page: 951
Publisher DOI: 10.1016/j.electacta.2008.08.031
Abstract: Niobium has been anodized at a constant current density to 10 V with a current decay in 0.8 mol dm-3 K2HPO4-glycerol electrolyte containing 0.08 to 0.65 mass% water at 433 K to develop porous anodic oxide films. The film growth rate is markedly increased when the water content is reduced to 0.08 mass%; a 28 μm-thick porous film is developed in this electrolyte by anodizing for 3.6 ks, while the thickness is 4.6 and 2.6 μm in the electrolytes containing 0.16 and 0.65 mass% water respectively. For all the electrolytes, the film thickness changes approximately linearly with the charge passed during anodizing, indicating that chemical dissolution of the developing oxide is negligible. SIMS depth profiling analysis was carried for anodic films formed in electrolyte containing ~0.4 mass% water with and without enrichment of H218O. Findings disclose that water in the electrolyte is a predominant source of oxygen in the anodic oxide films. The anodic films formed in the electrolyte containing 0.65 mass% water are practically free from phosphorus species. Reduction in water content increased the incorporation of phosphorus species.
Type: article (author version)
URI: http://hdl.handle.net/2115/35512
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: 幅崎 浩樹

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