Mechanism of Na2 SO 4 ‐ Induced Corrosion of Molybdenum Containing Nickel‐Base Superalloys at High Temperatures: I . Corrosion in Atmospheres Containing Only
- 1 May 1986
- journal article
- Published by The Electrochemical Society in Journal of the Electrochemical Society
- Vol. 133 (5) , 1029-1038
- https://doi.org/10.1149/1.2108700
Abstract
The corrosion of nickel‐base superalloys containing molybdenum has been studied in the temperature range 750°–950°C in the presence of a deposit. The corrosion kinetics were determined and the corrosion products were characterized by metallography, SEM, and chemical analysis. The alloys underwent catastrophic corrosion in the presence of a deposit, and the corrosion was associated with the formation of a melt. The results obtained in the present study have been analyzed according to various hot corrosion models. Based on transport considerations and the Rapp‐Goto criteria for fluxing, oxide fluxing appears to be unlikely. It is suggested that rapid corrosion occurs by dissolution of Ni at the melt‐alloy/oxide interface and formation of at the melt‐gas interface. The rate of evaporation of from melts has been studied, and it is shown that the rate of evaporation of is decreased considerably when dissolved in .Keywords
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