Characterization of pack cemented Ni2Al3 coating exposed to KCl(s) induced corrosion at 600 °C

Kristian Vinter Dahl*, A. Slomian, Trine Nybo Lomholt, Saeed Kiamehr, Flemming Bjerg Grumsen, Melanie Montgomery, T. Jonsson

*Corresponding author for this work

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    Abstract

    Oxidation of Ni2Al3 produced by pack aluminizing of pure nickel was studied with and without 0.10 mg cm−2 KCl(s) deposit in an environment containing 5% O2, 40% H2O and 55% N2 at 600 °C for up to 168 h. Oxide microstructure and composition was investigated by SEM/EDX, BIB, TEM and GDOES. Oxidised Ni2Al3 shows minimal weight gain, while adding KCl results in a small weight loss consistent with evaporation of KCl. On the surface of samples exposed to the gas environment only, a 30 nm oxide of Al oxide was present, but where KCl was present as deposit, 50–250 nm thick nodules form that are enriched in K, O and Al.
    Original languageEnglish
    JournalMaterials at High Temperatures
    Volume35
    Issue number1-3
    Pages (from-to)267-274
    ISSN0960-3409
    DOIs
    Publication statusPublished - 2018

    Keywords

    • Nickel aluminide
    • KCI
    • High temperature corrosion
    • 600 °C
    • Electron microscopy

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