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The role of tungsten species in the transition of anodic nanopores to nanotubes formed on iron alloyed with tungsten

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Title: The role of tungsten species in the transition of anodic nanopores to nanotubes formed on iron alloyed with tungsten
Authors: Fadillah, Laras Browse this author
Takase, Kentaro Browse this author
Kobayashi, Hikaru Browse this author
Turczyniak-Surdacka, Sylwia Browse this author
Strawski, Marcin Browse this author
Kowalski, Damian Browse this author
Zhu, Chunyu Browse this author
Aoki, Yoshitaka Browse this author
Habazaki, Hiroki Browse this author →KAKEN DB
Keywords: Anodizing
Iron oxide
Anodic oxide
Issue Date: 20-Jun-2019
Publisher: Elsevier
Journal Title: Electrochimica acta
Volume: 309
Start Page: 274
End Page: 282
Publisher DOI: 10.1016/j.electacta.2019.03.206
Abstract: The effect of alloying of sputter-deposited Fe with 9 at.% tungsten on the growth of nanoporous anodic oxide was studied in ethylene glycol electrolyte containing 0.1 mol dm(-3) ammonium fluoride and 1.5 mol dm(-)(3) water. The classic nanoporous anodic film (Al2O3-like) was developed on pure Fe while the transition of nanopores to nanotubes (TiO2-like) was observed for anodizing of Fe-W alloy. The pores/ nanotubes having average diameter 50-110 nm and 30-60 nm on pure Fe and Fe-W alloy anodized at voltage 40-60 V, respectively. Both nanoporous/nanotubular anodic films grow in line with the field assisted flow model with a few fundamental details: i) transition of nanopores to nanotubes is observed upon anodizing of Fe-W alloy, ii) significant reduction of the cell size (nanotube diameter) is obtained on Fe-W alloy, iii) relatively thick layer is produced at Fe-W alloy/oxide interface. The primary reason of this transition to nanotubes as well as chemical changes is discussed in view of effective modification of the cell boundary region with tungsten species, probably WF6 compound, upon growth of anodic film under influence of high electric field strength. The possible reason of developing the space in between nanotubes is faster kinetics of WF6 reaction with water over the presence of low solubility FeFx species. Alloying of iron is one of the effective ways to modify the nanostructure of the anodic film on iron. (C) 2019 Elsevier Ltd. All rights reserved.
Rights: © 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Type: article (author version)
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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