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 journalpeer-review

View graph of relations

Author(s)

  • Dingding Zhu
  • Xinli Wang
  • Jun Zhao
  • Yichun Zhou
  • Canying Cai
  • Jianyu Huang
  • Guangwen Zhou

Detail(s)

Original languageEnglish
Article number108963
Journal / PublicationCorrosion Science
Volume177
Online published28 Aug 2020
Publication statusPublished - Dec 2020

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; Lu, Jian; Zhou, Yichun; Cai, Canying; Huang, Jianyu; Zhou, Guangwen.

In: Corrosion Science, Vol. 177, 108963, 12.2020.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review