Abstract
To further understanding of the potential effects of zinc containing contaminants or fuel additives in gas turbine hot corrosion, the corrosion of (a gas turbine blade coating alloy) spray coated with 50 mole percent was compared with that of spray coated with alone at 700° and 850°C in air containing controlled partial pressures. Thermobalance experiments showed that delayed initiation of low temperature (700°) hot corrosion of , but did not significantly change the total amount of corrosion, nor inhibit LTHC once the propagation stage of corrosion was reached. At 850°, gave somewhat more corrosion than pure , presumably because allowed formation of a liquid sulfate phase. Molten was shown to follow regular solution behavior at 850°, with the standard free energy for formation of in being −9.34 kcal/mol. The overall results suggest that zinc would be of doubtful benefit as an inhibitor for gas turbine hot corrosion.
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