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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