4.7 Article

Supercritical-CO2 corrosion behavior of alumina- and chromia-forming heat resistant alloys with Ti

期刊

CORROSION SCIENCE
卷 188, 期 -, 页码 -

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2021.109531

关键词

Heat resistant alloy; Alumina-forming alloy; Supercritical carbon dioxide; Al2O3; Pre-oxidation

资金

  1. Nuclear R&D Program of the MSIT/NRF of the Rep. of Korea [2016R1A5A101391921, 2019M2D2A2050927]
  2. BK-Plus Program of the National Research Foundation (NRF) of the Rep. of Korea
  3. KAIST Analysis Center for Research Advancement (KARA)
  4. National Research Foundation of Korea [2019M2D2A2050927] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

向作者/读者索取更多资源

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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