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.
- Nickel aluminide
- High temperature corrosion
- 600 °C
- Electron microscopy
Dahl, K. V., Slomian, A., Lomholt, T. N., Kiamehr, S., Grumsen, F. B., Montgomery, M., & Jonsson, T. (2018). Characterization of pack cemented Ni2Al3 coating exposed to KCl(s) induced corrosion at 600 °C. Materials at High Temperatures, 35(1-3), 267-274. https://doi.org/10.1080/09603409.2017.1392112