This study investigates the corrosion behavior of candidate steels with different Cr content in high-temperature s-CO2 environments and the influence of operating pressure. The results underscore the significant role of chromium, with content above 16 wt.% in the base metal proving effective in terms of conferring corrosion resistance. Moreover, the study reveals the substantial impact of operating pressure on weight gain, resulting in much thicker oxide layers. Further microscopic examinations may be required to gain deeper insights into oxide layer structure and composition. These findings advance our understanding of corrosion modes and extent within s-CO2 Brayton cycles.

Subject
Scanning electron microscopy, Test methods, Stainless alloys, Nickel based alloys, Oxide formation, Autoclaves, Oxide layers, Weight gain, Weight loss analysis, Steel, Alloys, Oxidation, Samples
Keywords:
supercritical CO2, Brayton cycle, high temperature, corrosion, stainless steel
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2024
GOV
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