Abstract
CMSX-4 samples were exposed to type II hot corrosion conditions (700 °C, 300 vpm SO X in air) for between 12.5 and 500 h. Two deposits (4/1 molar ratio Na2SO4/K2SO4 and 49/1 molar ratio Na2SO4/NaCl) were tested with fluxes between 0 and 10 μg cm−2 h−1. Dimensional metrology studies showed similar metal losses for samples exposed with the same flux but to different salts. Duplicate samples exposed under identical conditions gave repeatable metal loss data. Samples exposed to low deposition fluxes for short exposure periods maintained surfaces in incubation despite the low chromium content of CMSX-4. For higher fluxes, incubation times and propagation rates were determined.
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Acknowledgments
We would like to acknowledge the support of The Energy Programme, which is a Research Councils UK cross council initiative led by EPSRC and contributed to by ESRC, NERC, BBSRC and STFC, and specifically the Supergen initiative (Grants GR/S86334/01 and EP/F029748) and the following companies; Alstom Power Ltd., Doosan Babcock, E.ON, National Physical Laboratory, Praxair Surface Technologies Ltd, QinetiQ, Rolls-Royce plc, RWE npower, Siemens Industrial Turbomachinery Ltd., and Tata Steel, for their valuable contributions to the project. In addition, the authors would like to thank A. Potter for assistance with running the tests and K. Petra for assistance with sample preparation.
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Sumner, J., Encinas-Oropesa, A., Simms, N.J. et al. Type II Hot Corrosion: Kinetics Studies of CMSX-4. Oxid Met 80, 553–563 (2013). https://doi.org/10.1007/s11085-013-9395-x
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DOI: https://doi.org/10.1007/s11085-013-9395-x