Limited role of cation bulk diffusion in the oxidation of pure iron to magnetite
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Recent experimental results for the oxidation of pure iron to magnetite below the eutectoid temperature for the formation of wüstite (570 °C) are re-analysed with respect to the mechanisms which control the overall reaction kinetics. The experimental parabolic rate constants are compared with those expected for cation bulk diffusion controlled reaction kinetics. The comparison shows that the experimental rate constants are as much as two orders of magnitude larger than the calculated values suggesting that processes other than cation bulk diffusion contribute to the overall reaction kinetics in the set of experiments investigated.
KeywordsOxidation Iron Polymer Magnetite Experimental Rate
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- 1.H. Schmalzried, “Solid state reactions”, 2nd edn (Verlag Chemie, Weinheim, Deerfield,Beach, Basel, 1981).Google Scholar
- 13.R. Dieckmann, unpublished compilation of data from literature.Google Scholar
- 14.M. H. Davies, M. T. Simnad and C. E. Birchenall, “On the mechanism and kinetics of the scaling of iron”, Trans AIME 191 (1951) 889–896.Google Scholar
- 15.A. Atkinson, “Grain-boundary diffusion in oxides and its contribution to oxidation processes”, AERE Rep. 12404 (1987).Google Scholar