Anodic Dissolution of Iron Silicides in Alkaline Electrolyte

A. B. Shein^a, I. L. Rakityanskaya^a, and S. F. Lomaeva^b

^a Perm’ State University, ul. Bukireva 15, Perm, 614600 Russia

E-mail: ashein@psu.ru

^b Physicotechnical Research Institute, Russian Academy of Sciences, Ural Branch, Izhevsk, Russia

Received November 11, 2005

Abstract—Anodic dissolution of iron and its silicides (FeSi, FeSi₂, as well as the eutectic alloy FeSi₂–Si) and
pure Si, in 0.1 to 5.0 N NaOH solutions is studied by cyclic voltammetry and x-ray photoelectron spectroscopy.
Principal characteristic features of the silicide anodic dissolution are revealed and the composition of surface
films investigated. It is shown that, despite an increase in Si solubility at higher pHs, the iron silicides are highly
resistant to anodic dissolution due to especial protective properties of the complex oxide surface film.

PACS numbers: 81.65.Rv; 82.45.Bb

DOI: 10.1134/S0033173207010079

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