Corrosion of Iron and Iron
Silicon Finely Dispersed Systems in Neutral Media. Part III. Fe
Si Systems Prepared by Milling in Pure Heptane or with Oleic-Acid
A. V. Syugaeva, S. F. Lomaevaa, and S. M. Reshetnikovb
a Physicotechnical Institute, Ural Branch, Russian Academy of Sciences,
ul. Kirova 132, Izhevsk, 426000 Russia
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b Udmurtia State University, ul. Universitetskaya 1, Izhevsk, 426034 Russia
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Received October 17, 2005
Abstract — Corrosion behavior and the surface layer structure are studied for Fe80Si20 powders mechanically milled in heptane, in particular, with 0.3 wt % of oleic acid. In heptane, the powders become enriched with amorphous phase as time passes, which improves the corrosion resistance significantly. In the presence of oleic acid, some small amount of the amorphous phase is formed indeed in the bulk of the particles; however, the powders’ surfaces become covered by an oxide–organic protective film. With an increase in the milling time, in the presence of oleic acid, the Fe–Si alloy is depleted of silicon because of the SiO2 phase segregation, which deteriorates the powders’ corrosion resistance.
PACS numbers: 82.45.Yz
DOI: 10.1134/S0033173206040023