Abstract
Three types of hot corrosion tests were performed on TiAl-based intermetallics Ti–48Al, Ti–Ti–52Al and 48Al–2Cr (at.%). The salt mixture that was used in the present hot corrosion study consists of 80 wt.% Na 2SO 4+20 wt.% NaCl, with a melting point of ∼700 °C. The specimens were either suspended in the salt vapour, deposited with the mixed salt, or immersed in the molten salt, all at 800 °C. These testing methods represent different service conditions, and produced different results. However, these results are consistent in ranking the hot corrosion properties of materials. Electron microscopy and X-ray diffraction (XRD) were used to study the morphology and compositions of the corrosion products. The mechanisms of hot corrosion have also been discussed based on the experimental results.
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