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

    Funding

    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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