Compatibility of Different Commercial Alloys in High-Temperature, Supercritical Carbon Dioxide

In this work, the compatibility and long-term integrity of candidate structural materials, including the austenitic stainless steel 316NG, the Fe-Ni-based alloy 800H, and the Ni-based alloy 625, were tested in high-temperature and high-pressure SCO2. The exposure time was up to 3000 h. The results showed that the corrosion kinetics approximately followed a near-cubic law for 316NG and 800H. After 3000 h exposure, all oxide layers, mainly composed of Cr2O3, were continuous, compact, and protective, and their thicknesses were about 21 similar to 45 nm, 64 similar to 88 nm, and 34 similar to 43 nm, respectively. In the case of carburization, dark spots corresponding carbon deposition were observed on the surface and a little enriched in the underside of the oxide for 800H. Moreover, the enrichment of trace elements was found at the oxide/substrate interface through GDOES and TEM analyses, i.e., the enrichment of Mn and Si for 316NG, the enrichment of Mn, Si, Al, and Ti for 800H, and the enrichment of Ti and Al for alloy 625.

Automated summary

In this study, the compatibility and long-term integrity of candidate structural materials in high-temperature and high-pressure SCO2 were tested. The results showed that the corrosion kinetics of 316NG and 800H followed a near-cubic law. After 3000 hours of exposure, all oxide layers were continuous, compact, and protective. In the case of carburization, dark spots and enrichment of trace elements were observed.