|
Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Engineering / Faculty of Engineering >
Peer-reviewed Journal Articles, etc >
Importance of water content in formation of porous anodic niobium oxide films in hot phosphate-glycerol electrolyte
| 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
|
