Electrochemistry and photoelectrochemistry of ferrosilicide (Fe//xSi) alloys in neutral solutions

G. H. Kelsall, R. A. Williams

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The corrosion and passivation behaviour of ferrosilicide (Fe//xSi) alloys in neutral solutions has been studied as a function of alloy composition (0 - 30 wt % Si) in deoxygenated borate and phthalate buffers using cyclic voltammetry, a scraped rotating ring-disc electrode (SRRDE), photocurrent spectroscopy, a. c. impedance and X-ray photoelectron spectroscopy (XPS). The thermodynamics of the system have been summarised in the form of activity-pH and E//h-pH diagrams, the latter showing that preferential oxidation of the silicon component of the alloy could occur, producing an (amorphous) SiO//2 surface phase at potentials more negative than required for oxidation of iron. At higher potentials, passivation was shown to be due to a silica-rich Fe (III) oxide film, exhibiting n-type semiconducting properties with a bandgap of 1. 9 - 2. 02 eV, for 0 - 15. 8 wt % Si ferrosilicon alloy compositions.

Original languageEnglish
Title of host publicationSurfaces, inhibition, and passivation: Proceedings of an International Symposium Honoring Doctor Norman Hackerman on His Seventy-Fifth Birthday
PublisherCorrosion Division, Electrochemical Society
Pages547-561
Number of pages15
Publication statusPublished - 1986

Publication series

NameProceedings
PublisherElectrochemical Society
Number7
Volume86
ISSN (Print)0161-6374

ASJC Scopus subject areas

  • Engineering(all)

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    Kelsall, G. H., & Williams, R. A. (1986). Electrochemistry and photoelectrochemistry of ferrosilicide (Fe//xSi) alloys in neutral solutions. In Surfaces, inhibition, and passivation: Proceedings of an International Symposium Honoring Doctor Norman Hackerman on His Seventy-Fifth Birthday (pp. 547-561). (Proceedings; Vol. 86, No. 7). Corrosion Division, Electrochemical Society.