Structural-Phase Composition and Corrosion Behavior of Finely Dispersed FeC Powders in Neutral Media

S. F. Lomayeva*, B. B. Bokhonov**, A. V. Syugaev*,E. P. Elsukov*, and S. M. Reshetnikov***

* Physicotechnical Institute, Ural Division, Russian Academy of Sciences,
ul. Kirova 132, Izhevsk, 426000 Russia

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** Institute of Solid-State Chemistry and Mineral Processing, Siberian Division,
Russian Academy of Sciences, ul. Kutateladze 18, Novosibirsk, 630128 Russia

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*** Udmurt State University, ul. Universitetskaya 1, Izhevsk, 426034 Russia

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Received August 16, 2004

Abstract — Effects of the structural-phase state and the structure of the surface layer on the corrosion behavior of mechanically activated finely dispersed Fe–C powders were studied. The powders prepared by mechanical milling of iron in graphite or heptane were mixtures of phases (nanocrystalline -Fe + amorphous Fe–C phase (AP), -Fe + Fe₃C, and -Fe + graphite) in different ratios. Corrosion tests were carried out in a model medium (0.85% NaCl) at 37°C. The oxide surface layer of powders containing a high content of AP was found to exhibit protective properties. The corrosion behavior of the powders is insensitive to such changes in the structuralphase state as the formation of carbides, graphite encapsulation, grain size alterations, and hydrogenation.