Abstract
The corrosion of Fe-Nb alloys containing up to 40 wt.% Nb has been studied over the temperature range 600–980°C in a mixed gas of constant composition having sulfur and oxygen pressures ranging from 10−8 to 10−4 atm. and from 10−27 to 10−18 atm., respectively. All alloys were two-phase, consisting of an Fe-rich solid solution and an intermetallic compound, Fe2Nb. The scales formed on the Fe-Nb alloys were duplex, consisting of an outer layer of iron sulfide (FeS) and an inner complex layer of FexNbS2(FeNb2S4 or FeNb3S6), FeS and unreacted Fe2Nb. No oxides were detected at any temperature. The addition of Nb reduced the corrosion rate. The corrosion kinetics of Fe-Nb alloys followed the parabolic rate law, regardless of alloy composition and temperature. Platinum markers, attached to the original alloy surfaces, were always located at the interface between the inner and outer scales.
Similar content being viewed by others
References
F. Gesmundo and F. J. Viani,J. Electrochem. Soc. 128, 470 (1981).
G. C. Wood and F. H. Stott,Mater. Sci. Technol. 3, 519 (1987).
S. Mrowec and K. Przybylski,High Temp. Mater. Proc. 6(1) (1984).
S. Mrowec and K. Przybylski,Oxid. Met. 23, 107 (1985).
K. N. Strafford,The Degradation of Metallic Materials by Sulphidizing Gases, and the Potential of the Refractory Metals for High-Temperature Service in Complex Sulphur-Bearing Atmospheres of Low Oxygen Potential (Institute of Metallurgists Conference on Environmental Degradation of High Temperature Materials, Isle of Man, U.K., 1980).
B. Gleeson, D. L. Douglass and F. Gesmundo,Oxid. Met. 31, 209 (1989).
G. Wang, R. Carter and D. L. Douglass,Oxid. Met. 32, 273 (1989).
M. F. Chen and D. L. Douglass,Oxid. Met. 32, 185 (1989).
B. Gleeson, D. L. Douglass and F. Gesmundo,Oxid. Met. 33, 425 (1989).
R. V. Carter, D. L. Douglass and F. Gesmundo,Oxid. Met. 31, 341 (1989).
M. F. Chen, D. L. Douglass and F. Gesmundo,Oxid. Met. 31, 237 (1989).
C. Shing and D. L. Douglass (to be published).
Y. He and D. L. Douglass (to be published).
T. B. Massalski, J. L. Murray, L. H. Benett, and H. Baker,Binary Alloy Phase Diagrams, Vol 1, (ASM, 1986).
R. C. Weast,Handbook of Chemistry and Physics, 58th Ed. (CRC Press, 1977–78).
S. Mrowec and J. Janowski, inAdvances in Ceramics Nonstoichiometric Compounds,C. R. A. Catlow and M. C. Markrodt, eds.,Am. Ceram. Soc. 23, 585 (1986).
D. J. Young,Rev. High Temp. Mater. 14, 299 (1980).
J. P. Orchard and D. J. Young,J. Electrochem. Soc. 136, 545 (1986).
N. B. Pilling and R. Z. Bedworth,J. Inst. Met. 29, 529 (1923).
JANAF Thermochemical Tables, 3rd Ed. (American Chemical Society and American Institute of Physics for National Bureau of Standards, 1986).
A. Rahmel, M. Schorr, A. Velasco-Tellez, and A. Pelton,Oxid. Met. 27, 199 (1987).
G. J. Yrek and M. H. LaBranche, inProceedings of the Conference on Corrosion-Erosion-Wear of Materials in Emerging Fossil Energy System, ed. (A. V. Levy. NACE, Houston (1982), p. 993.
R. A. Perkins,High Temp. Corrosion, ed. (R. A. Rapp, NACE, Houston, 1983), p. 345.
K. Natesan,Corrosion 41, 646 (1985).
G. Wang, B. Gleeson and D. L. Douglass,Oxid Met. 31, 415 (1989).
B. S. Lee and R. A. Rapp,J. Electrochem. Soc. 131, 2998 (1984).
F. Kadijk and F. Jellinek,J. Less-Common Met. 19, 421 (1960).
F. Gesmundo (unpublished results).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Kai, W., Douglass, D.L. & Gesmundo, F. The high-temperature corrosion of Fe-Nb alloys in a H2/H2O/H2S gas mixture. Oxid Met 37, 189–215 (1992). https://doi.org/10.1007/BF00665189
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF00665189