Effect of water vapor on high-temperature oxidation of NiAl alloy
Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review
Author(s)
Related Research Unit(s)
Detail(s)
Original language | English |
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Article number | 108963 |
Journal / Publication | Corrosion Science |
Volume | 177 |
Online published | 28 Aug 2020 |
Publication status | Published - Dec 2020 |
Link(s)
Abstract
The high-temperature oxidation of NiAl is studied with dry oxygen and water vapor. The oxidation in H2O results in a thicker Al2O3 oxide scale than that in O2. The oxide scale formed initially is a single layer of γ-Al2O3 that subsequently transforms into a α-Al2O3/γ-Al2O3 bilayer structure, in which the inner α-Al2O3 layer formed in H2O has a higher porosity than that in O2. Further density functional theory calculations show that H protons derived from H2O molecules penetrate into the oxide lattice and boost the formation of lattice vacancies in both α-Al2O3 and γ-Al2O3, thus enhancing the oxide scale growth.
Research Area(s)
- Density-functional theory (DFT), H2O, High-temperature oxidation, NiAl, O2, Transmission electron microscopy (TEM)
Citation Format(s)
Effect of water vapor on high-temperature oxidation of NiAl alloy. / Zhu, Dingding; Wang, Xinli; Zhao, Jun et al.
In: Corrosion Science, Vol. 177, 108963, 12.2020.Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review