Journal
CORROSION SCIENCE
Volume 188, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2021.109531
Keywords
Heat resistant alloy; Alumina-forming alloy; Supercritical carbon dioxide; Al2O3; Pre-oxidation
Funding
- Nuclear R&D Program of the MSIT/NRF of the Rep. of Korea [2016R1A5A101391921, 2019M2D2A2050927]
- BK-Plus Program of the National Research Foundation (NRF) of the Rep. of Korea
- KAIST Analysis Center for Research Advancement (KARA)
- National Research Foundation of Korea [2019M2D2A2050927] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Two different types of alloys showed varying levels of corrosion behavior in high temperature and pressure supercritical-CO2 environment, with the chromia-forming alloy exhibiting more severe corrosion. Pre-oxidation treatment improved corrosion resistance by preventing Fe-rich oxide nodule formation and oxide spallation, especially for alloy A with formation of alpha-Al2O3.
Short-term corrosion behavior of the alumina- and chromia-forming Fe-Ni-based heat resistant alloys with Ti for gamma'-Ni-3(Al,Ti) precipitation were evaluated in supercritical-CO2 (sCO(2)) environment at 650 degrees C and 20 MPa for 457 h. The corrosion test showed development of thinner oxides with some occasional Fe-rich oxide nodules in alumina-forming alloy A (16Cr-4.5Al-3Ti). However, chromia-forming alloy C (20Cr-2Al-2Ti) exhibited several occurrences of Fe-rich oxide nodules and spallation of thinner oxides. Meanwhile, the pre-oxidation treatment resulted in improved corrosion resistance in sCO(2) environment by preventing the Fe-rich oxide nodule formation and oxide spallation, especially for alloy A with formation of alpha-Al2O3.
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