Abstract
The oxidation kinetics for cobalt and two cobalt—iron alloys alloys, CoFe and CoFe3, were determined between 1073 and 1280 K in 1 atm. of oxygen. The oxidation of cobalt and CoFe follows a parabolic law, while the oxidation of CoFe3 is better described by a direct logarithmic law. The oxidation rates for the cobalt—iron alloys alloys are lower than those expected from combining oxidation kinetics of pure iron and pure cobalt, thus suggesting a significant cobalt enrichment occurs at the oxide surface. This cobalt enrichment is observed using energy dispersive analyses. The logarithmic kinetics of CoFe3 during oxidation is discussed, and a model is proposed to explain this behavior.
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References
A. L. Cabrera, B. C. Sales, and M. B. Maple,Phys. Rev. B,25, 1688 (1982).
A. L. Cabrera, Ph. D. thesis, University of California, San Diego (1980).
B. C. Sales, M. B. Maple, and F. L. Vernon, III,Phys. Rev. B 18, 486 (1978).
B. C. Sales, A. L. Cabrera, and M. B. Maple,Solid State Commun.,30, 119 (1979).
R. M. Brick, A. W. Pense, and R. B. Gordon,Structure and Properties of Engineering Materials, 4th ed. (McGraw-Hill, Inc., New York, 1977).
J. F. Kirner and A. L. Cabrera,J. Heat Treat.,7, 27 (1989).
P. Mayer and W. W. Smeltzer,Oxid. Met,10, 329 (1976).
K. R. Lawless,Rep. Prog. Phys.,37, 231 (1974).
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Cabrera, A.L., Maple, M.B. Oxidation kinetics of cobalt and cobalt—iron alloys at high temperatures. Oxid Met 32, 207–224 (1989). https://doi.org/10.1007/BF00664799
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DOI: https://doi.org/10.1007/BF00664799