Effects of Complex Material-Environment Interactions on Hot Corrosion Mechanisms

Kevin Meisner
Low temperature hot corrosion (LTHC) is the degradation of gas turbine components by reaction with a molten salt at approximately 700 °C. LTHC is typically attributed to eutectic melts of a mixture of Na2SO4 and sulfates of alloying elements, particularly NiSO4 and CoSO4. However, characterization of NiCoCrAlY-coated field hardware shows corrosive deposits are rich in MgO and/or MgSO4 (referred to here as Mg2+) as well as Na2SO4. The literature on the effects of Mg2+ additions...
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