Abstract
Sodium sulfate deposits generated by impurities in the fuels can be reduced to more corrosive sulfide in the presence of partially uncombusted hydrocarbons, the reduction temperature depending upon the carbon particle size. Thermogravimetric studies indicate that nickel oxide and oxidized nickel metal are rapidly reduced by methane between 500° and 1000°C with deposition of pyrolytic carbon. The analogy is pointed out between the attack on a Ni-13Al-10Cr alloy by Na2SO4 both in the presence of carbon deposits and in a reducing atmosphere of hydrogen. It appears that carbon deposition by promoting local reducing conditions can play an important role in the occurrence of hot-corrosion in gas turbines.
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