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Formation and field-assisted dissolution of anodic films on iron in fluoride-containing organic electrolyte

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Title: Formation and field-assisted dissolution of anodic films on iron in fluoride-containing organic electrolyte
Authors: Shahzad, Khurram Browse this author
Tsuji, Etsushi Browse this author
Aoki, Yoshitaka Browse this author
Nagata, Shinji Browse this author
Habazaki, Hiroki Browse this author →KAKEN DB
Keywords: Anodizing
iron
porous anodic film
organic electrolyte
fluoride
Issue Date: 1-Jan-2015
Publisher: Elsevier
Journal Title: Electrochimica acta
Volume: 151
Start Page: 363
End Page: 369
Publisher DOI: 10.1016/j.electacta.2014.10.132
Abstract: Magnetron-sputtered iron films were potentiodynamically anodized at two different sweep rates to 50 V in an ethylene glycol electrolyte containing ammonium fluoride and water. At a high sweep rate of 1.0 V s(-1), a barrier-type anodic film was formed even though the current efficiency was as low as similar to 50%. In contrast, a nanoporous anodic film developed at a low sweep rate of 0.05 V s(-1), and the film-formation efficiency reduced to 37%. The main part of the anodic films consists of iron (III) hydroxyfluoride with a thin inner layer composed of FeF3. The inner fluoride layer is formed owing to the faster inward migration of fluoride ions compared to that of the oxygen species. During immersion or re-anodizing of the iron specimen with an approximately 100-nm-thick, barrier-type anodic film at and below 15 V, thinning of the anodic film proceeded uniformly and film dissolution was enhanced by applying an electric field. The impact of the electric field on film formation and dissolution is discussed.
Type: article (author version)
URI: http://hdl.handle.net/2115/57952
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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