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Abstract
A study is carried out on the effect of different surface native pre-oxides on hot corrosion of single crystal nickel-based superalloy at 900 °C. The effect of different oxides formed by different superalloys through pre-oxidation on hot corrosion is verified by normal hot corrosion and tube sealing experiments. The relationship between different surface oxides and the effect of different surface oxides layer on the hot corrosion properties of alloys are studied. In summary, the stable and dense surface pre-Al2O3 layer which can be obtained by pre-oxidation has an obvious positive effect on the improvement of superalloy hot corrosion resistance in reaction. In addition, the internal sulfides are analyzed in depth, and the relationship between Cr, Mo, O and S is discussed in detail.
Highlights
The industry gas turbines (IGTs) have the highest thermal-power conversion efficiency and a relatively long service life, but their service life and strength are generally affected by the harsh environment [1]
Compared with the aero gas turbines that usually use clean fuels treated by desulfurization, industry gas turbines and marine gas turbine are more susceptible to hot corrosion due to the use of primitive fuel for reducing costs, the high oxygen concentration in the service environment and the high vulnerability to corrosion by seawater
Pre-oxidation and tube sealing experiments are used to determine the role of oxides on hot corrosion in term of reaction
Summary
The industry gas turbines (IGTs) have the highest thermal-power conversion efficiency and a relatively long service life, but their service life and strength are generally affected by the harsh environment [1]. Compared with the aero gas turbines that usually use clean fuels treated by desulfurization, industry gas turbines and marine gas turbine are more susceptible to hot corrosion due to the use of primitive fuel for reducing costs, the high oxygen concentration in the service environment and the high vulnerability to corrosion by seawater. NaCl in non-pure water will bring bad effects in hot corrosion on the service process of superalloys [2,3]. It is important to note that the oxidation of single crystal superalloy at this temperature is usually not severe as hot corrosion
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