Abstract
The components of gas-turbine engines operating in marine environments are highly susceptible to hot corrosion, which is typically classified as Type II (650–750 °C) and Type I (900–950 °C) hot-corrosion attack. Even though hot-corrosion has been widely investigated in the last 50 years, several critical questions remain unanswered and new ones have emerged based on recent observations that, in part, are associated with the increasing complexity of the alloy systems and the sulfate-deposit chemistries. The present work is focused on the Type II hot-corrosion mechanism for Co-base alloys. Observations for a CoCrAlY model alloy (isothermally exposed at 700 and 800 °C under different atmospheres, including: air and O2 with 100 and 1000 ppm SO2) suggest the rapid dissolution of Co (as Co-oxide) is not the controlling factor in the degradation mechanism, as was proposed by Luthra, since the γ-phase which is richer in Co, is not attacked as significantly as the Al-rich β-phase. To the contrary, it is suggested that Al (and Cr) is (are) the element(s) which is (are) removed first. A modified interpretation of the Type II hot-corrosion mechanism is proposed, which is based on the synergistic fluxing model developed by Hwang and Rapp.
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Acknowledgements
The authors gratefully acknowledge the financial support for this work by the Office of Naval Research through Grant No. N00014-10-1-0661 (Dr. David A. Shifler, Technical Monitor).
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Alvarado-Orozco, J.M., Garcia-Herrera, J.E., Gleeson, B. et al. Reinterpretation of Type II Hot Corrosion of Co-Base Alloys Incorporating Synergistic Fluxing. Oxid Met 90, 527–553 (2018). https://doi.org/10.1007/s11085-018-9853-6
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DOI: https://doi.org/10.1007/s11085-018-9853-6