Abstract.
The oxidation behavior of FeCoNi, FeCoNiCr, and FeCoNiCrCu equi-molar alloys was studied over the temperature range 800–1000 °C in dry air. The ternary and quaternary alloys were single-phase, while the quinary alloy was two-phase. In general, the oxidation kinetics of the ternary and quinary alloys followed the two-stage parabolic rate law, with rate constants generally increasing with temperature. Conversely, three-stage parabolic kinetics were observed for the quaternary alloy at T ≥ 900°C. The additions of Cr and Cu enhanced the oxidation resistance to a certain extent. The scales formed on all the alloys were triplex and strongly dependent on the alloy composition. In particular, on the ternary alloy, they consist of an outer-layer of CoO, an intermediate layer of Fe3O4, and an inner-layer of CoNiO2 and Fe3O4. Internal oxidation with formation of FeO precipitates was also observed for this alloy, which had a thickness increasing with temperature. The scales formed on the quaternary alloy consisted of an outer layer of Fe3O4 and CoCr2O4, an intermediate layer of FeCr2O4 and NiCr2O4, and an inner layer of Cr2O3. Finally, the scales formed on the quinary alloy are all heterophasic, consisting of an outer layer of CuO, an intermediate-layer of CuO and Fe3O4, and an inner-layer of Fe3O4, FeCr2O4, and CuCrO2. The formation of Cr2O3 on the quaternary alloy and possibly that of CuCrO2 on the quinary alloy was responsible for the reduction of the oxidation rates as compared to the ternary alloy.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
F. H. Stott G. C. Wood M. G. Hobby (1971) Oxidation of Metals 3 103
G. C. Wood and F. H. Stott, in High Temperature Corrosion, R. A. Rapp, ed., NACE, Houston, TX, USA, 1983.
S. Mrowec K. Przybylski (1985) Oxidation of Metals 23 107
G. C. Wood F. H. Stott (1987) Materials Science and Technology 3 519
H. Hindam D. P. Whittle (1982) Oxidation of Metals 18 245
R. B. Schwarz W. L. Johnson (1983) Physics Review Letters 51 415
A. Inoue T. Zhang (1996) Materials Transactions JIM 37 185
W. Kai R. T. Huang (1997) Oxidation of Metals 48 439
M. Takiguch S. Ishii E. Makino A. Okabe (2000) Journal of Applied Physics 87 2469
C. D. Liu W. Kai Y. H. Shieh (2000) Journal of Chinese Corrosion Engineering 14 45
P. Kofstad (1988) High Temperature Corrosion Elsevier Applied Science London
Y. Niu Y. S. Li F. Gesmundo (2000) Corrosion Science 42 165
S. Mrowec K. Przybylski (1977) Oxidation of Metals 11 383
D. W. Bridges J. P. Baur W. M. Farrel SuffixJr. (1956) Journal of the Electrochemical Society 103 619
K. Fueki J. B. Wagner SuffixJr. (1965) Journal of the Electrochemical Society 112 384
P. Kofstad (1983) Nonstoichiometry, Diffusion, and Electrical Conductivity in Binary Metals Oxides Robert E. Krieger Publishing Company Florida, USA
P. Vallet P. Raccah (1965) Mem. Sci. Rev. Met 62 1
B. Fisher D. S. Tannhauser (1966) Journal of Chemical Physics 44 1663
Y. D. Tretyakov R. A. Rapp (1969) Transactions AIME 245 1235
R. A. Rapp (1965) Corrosion 21 382
Thermodynamic Data for Pure Substance, 3rd edn. (American Chemical Society and American Institute of Physics for National Bureau of Standards, 1995).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Kai, W., Jang, W.L., Huang, R.T. et al. Air Oxidation of FeCoNi-Base Equi-Molar Alloys at 800–1000°C. Oxid Met 63, 169–192 (2005). https://doi.org/10.1007/s11085-004-3198-z
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/s11085-004-3198-z