Abstract Scope |
The selection of appropriate constructional alloys for compact heat exchangers and joints is a critical material technology challenge on the successful deployment and long-term safe operation of the supercritical CO2 (s-CO2) Brayton cycle in advanced power generation systems. In this study, the corrosion behavior of Alloy 617 was investigated in s-CO2 streams with impurity at 600 oC and 30 MPa for up to 1000 h. The chemical composition and morphology of the formed surface corrosion products are characterized by optical images, X-ray diffraction, SEM, TEM. It is found that the main corrosion product is Cr2O3 and the corrosion mode includes both general oxidation and nodules corrosion. The effect of impurity on oxidation and carburization are also discussed. In all, the alloy shows an acceptable degradation rate, indicating the potential application in Brayton cycle. |