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


    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
    Number of pages14
    JournalHigh Temperature Corrosion of Materials
    StatePublished - 7 Mar 2024


    The experimental activity was financially supported by the KIT program “Materials and Technologies for the Energy Transition (MTET).” Thomas Bergfeldt, head of the Chemische Analytic group (KIT, IAM-AWP), deserves special thanks for providing access to inductively coupled plasma—optical emission spectrometry (ICP-OES) and corresponding data of composition of steels.

    FundersFunder number
    Karlsruhe Institute of Technology

      ASJC Scopus subject areas

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

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