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High‑temperature corrosion behavior of Fe‑18Ni‑12Cr‑2.9Al and Fe‑18Ni‑12Cr‑2.3Al‑Nb‑C austenitic steels depending on dissolved oxygen concentration in static liquid Pb at 700 °C

  • Valentyn Tsisar
  • , Zhangjian Zhou
  • , Olaf Wedemeyer
  • , Aleksandr Skrypnik
  • , Jürgen Konys
  • , Carsten Schroer

    Research outputpeer-review

    Abstract

    The corrosion behavior of the aluminum-alloyed austenitic steels Fe-18Ni-12Cr-2.9Al and Fe-18Ni-12Cr-2.3Al-Nb-C was investigated at 700 °C in static Pb for 1000 h as a function of the concentration of dissolved oxygen in the liquid metal. In Pb with ~ 5 × 10 –9 mass % dissolved oxygen, both steels showed dissolution. Depth of corrosion averaged 67 (± 18) µm and 78 (± 25) µm for Fe-18Ni-12Cr-2.3Al-Nb-C and Fe-18Ni-12Cr-2.9Al, respectively. In Pb with higher oxidation potential of 2 × 10 –6 mass %O, both steels showed protective and accelerated oxidation. The protective thin oxide film (≤ 1 µm) was composed of outermost Fe-rich, intermediate Cr-rich and inner Al-rich sublayers. The thicker oxide scale was of irregular thickness (2 ÷ 30 µm) and consisted of Fe–Cr mixed oxide with Ni-rich metallic inclusions.

    Original languageEnglish
    Pages (from-to)589-602
    Number of pages14
    JournalHigh Temperature Corrosion of Materials
    Volume101
    Issue number3
    DOIs
    StatePublished - Jun 2024

    ASJC Scopus subject areas

    • Metals and Alloys
    • Materials Chemistry
    • Inorganic Chemistry
    • Materials Science (miscellaneous)

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