Abstract
Commercially available high pressure tubing materials SS316 and Hastelloy-C276, containing a similar chromium content about 17 wt%, were internally pressurised by flowing supercritical CO2 at 20 MPa and heated externally, to 650 °C in the case of SS316, and 650–750 °C in the case of Hastelloy-C276. The stainless steel was found to be corroded by both external oxidation and internal carburisation. The external oxide was initially protective Cr-rich oxide, which was subsequently disrupted by faster growing Fe-rich oxide nodules, leading to loss of protection. In the case of Hastelloy-C276, the corrosion product was principally protective chromium oxide scale, although somewhat thicker regions of the same oxide developed at the site of micro-cracks in the metal surface. Very little carburisation of this alloy was observed up to at least 1000 h exposure. Differences in scaling behaviour are discussed in terms of chromium depletion through internal carbide precipitation.
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This project has been supported by the Australian Government through the Australian Renewable Energy Agency (ARENA). The Australian Government, through ARENA, is supporting Australian research and development in solar photovoltaic and concentrating solar power technologies to help solar power become cost competitive with other energy sources.
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Olivares, R.I., Young, D.J., Marvig, P. et al. Alloys SS316 and Hastelloy-C276 in Supercritical CO2 at High Temperature. Oxid Met 84, 585–606 (2015). https://doi.org/10.1007/s11085-015-9589-5
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DOI: https://doi.org/10.1007/s11085-015-9589-5