Ion migration and film morphologies in anodic alumina films formed in selenate electrolyte

A. Baron-Wiecheć, O. Ekundayo, S. J. Garcia-Vergara, H. Habazaki, H. Liu, P. Skeldon, G. E. Thompson

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Film morphologies and ionic migration are investigated for anodic oxides formed galvanostatically on electropolished aluminum in selenate electrolyte. Anionic selenium species that migrate at ∼0.2 to 0.3 times the rate of O2- ions were present in barrier films. Further, porous films could be generated by the use of sputtering-deposited aluminum substrates, although the film thickness is limited to ∼70 nm. Re-anodizing in pentaborate electrolyte at high efficiency revealed also a cationic selenium species that migrates at ∼0.6 to 0.7 times the rate of Al3+ ions, suggesting that the migration of selenium is affected by the morphology and growth mechanism of the film.

Original languageEnglish
Pages (from-to)C312-C317
JournalJournal of the Electrochemical Society
Volume159
Issue number7
DOIs
StatePublished - 2012
Externally publishedYes

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