Potter, AndrewSumner, JoySimms, Nigel2023-06-302023-06-302023-06-04Potter A, Sumner J, Simms N. (2023) Further investigations into alloy induced acidic fluxing. Materials at High Temperatures, Volume 40, Issue 4, 2023 pp. 338-3470960-3409https://doi.org/10.1080/09603409.2023.2219877https://dspace.lib.cranfield.ac.uk/handle/1826/19912Gas turbine materials often feature precipitates containing refractory metals to enhance their mechanical strength. This can make them susceptible to alloy-induced acidic fluxing whereby refractory elements increase the acidity of salt deposits. It is not clear to what degree degradation around alloy precipitates is caused by alloy-induced hot corrosion mechanisms, or the inability to develop a protective scale where precipitates are located. The effect of alloy-induced hot corrosion was isolated from the disruption of the protective-scale formation by adding particles of molybdenum to the 80/20 (Na/K)2SO4 deposit for a ‘deposit re-coat’ style hot corrosion test. The resulting morphologies were compared to samples exposed without the addition of molybdenum. Morphology changes were investigated using scanning electron microscopy with energy-dispersive X-ray mapping. Results show a mix of sulphidation and pitting. The effects of molybdenum additions appear more severe for MarM 509 compared to PWA 1483.enAttribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/Type II hot corrosionsuperalloysalloy-induced acidic fluxingmixed mode hot corrosionArticle