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

Shahzad, Khurram; Tsuji, Etsushi; Aoki, Yoshitaka; Nagata, Shinji; Habazaki, Hiroki

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

Shahzad, Khurram; Tsuji, Etsushi; Aoki, Yoshitaka et al.

Electrochimica acta, 2015, 151, 363-369

Permalink : https://hdl.handle.net/2115/57952

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アクセス権	open access
URI	https://hdl.handle.net/2115/57952
タイトル	Formation and field-assisted dissolution of anodic films on iron in fluoride-containing organic electrolyte
著者	Shahzad, Khurram ; Tsuji, Etsushi ; Aoki, Yoshitaka ; Nagata, Shinji ; Habazaki, Hiroki
著者名 Shahzad, Khurram
著者名 Tsuji, Etsushi
著者名 Aoki, Yoshitaka
著者名 Nagata, Shinji
e-Rad_Researcher 50208568 著者名 Habazaki, Hiroki
言語	英語
キーワード	Anodizing
	iron
	porous anodic film
	organic electrolyte
	fluoride
発行日	2015-01-01
出版者	Elsevier
収録物名	Electrochimica acta
巻(号)	151
ページ	363-369
抄録	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.
資源タイプ	学術雑誌論文
出版タイプ	Accepted Manuscript
PISSN	0013-4686
関連情報 (isVersionOf)	出版社版DOI https://doi.org/10.1016/j.electacta.2014.10.132