Supercritical CO2 is capable of being used in a variety of applications. These applications include; solvent for extraction, oil recovery, carbon capture and power generation (1-4). The areas of interest for this study will focus on conditions for advanced oil recovery and carbon capture and storage. The conditions of interest are above the critical point for CO2, which is 31.1°C and 7.39MPa (5).
Experimental
The autoclave contained CO2 at a pressure of 10 MPa and temperatures ranging from 40°C up to 150°C. Materials studied include; austenitic steels (stainless steel 304 and 316), and nickel based alloys (Inconel 625 and 718). Gamry software was used to control the potentiostat and analyze the data. Surface chemistry of the oxide layer was studied using X-ray diffraction, X-ray photoelectron and Raman spectroscopies.
Results
This study will discuss the corrosion current obtained and correlate it to the surface chemistry. Corrosion current was generally very low (e.g. 34.8nA for inconel 625 at 40°C).
Acknowledgements: This study was supported by the Department of Energy (DOE) under contract DE-NE0008236 and Nuclear Regulatory Commission (NRC) under awards NRC-38-10-949 and NRC-HQ-11-G-38-0039. D.R. is supported under a Fellowship program funded by NRC. Mr. Kenny Osborne and Ms. Nancy Hebron-Isreal serve as the program managers for the DOE and NRC awards, respectively.
References:
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3. K. Li, X. Zhou, R. Tu, Q. Xie, J. Yi and X. Jiang, The Journal of Supercritical Fluids, 107, 298 (2016).
4. J. Beck, M. Fedkina, S. N. Lvov, M. E. Ziomek-Moroz, G. Holcomb, J. Tylczak and D. Alman, ECS Transactions, 45, 39 (2013).
5. S. W. Løvseth, G. Skaugen, H. G. J. Stang, J. P. Jakobsen, Ø. Wilhelmsen, R. Span and R. Wegge, Energy Procedia, 37, 7841 (2013).