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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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dc.abstract.enThe 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.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorKowalski, Damian
dc.contributor.authorZhu, Chunyu
dc.contributor.authorAoki, Yoshitaka
dc.contributor.authorFadillah, Laras
dc.contributor.authorTakase, Kentaro
dc.contributor.authorTurczyniak-Surdacka, Sylwia
dc.contributor.authorKobayashi, Hikaru
dc.contributor.authorHabazaki, Hiroki
dc.contributor.authorStrawski, Marcin
dc.date.accessioned2024-01-26T10:47:12Z
dc.date.available2024-01-26T10:47:12Z
dc.date.issued2019
dc.description.financeNie dotyczy
dc.description.volume309
dc.identifier.doi10.1016/J.ELECTACTA.2019.03.206
dc.identifier.issn0013-4686
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/123088
dc.languageeng
dc.pbn.affiliationchemical sciences
dc.relation.ispartofElectrochimica Acta
dc.relation.pages274-282
dc.rightsClosedAccess
dc.sciencecloudnosend
dc.subject.enAnodizing
dc.subject.enIron oxide
dc.subject.enNanotubes
dc.subject.enAnodic oxide
dc.titleThe role of tungsten species in the transition of anodic nanopores to nanotubes formed on iron alloyed with tungsten
dc.typeJournalArticle
dspace.entity.typePublication