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.