Effect of water vapor on high-temperature oxidation of NiAl alloy
Journal Article
·
· Corrosion Science
- Xiangtan Univ. (China). School of Materials Science and Engineering; State Univ. of New York (SUNY), Binghamton, NY (United States)
- Xiangtan Univ. (China). School of Materials Science and Engineering
- Yanshan Univ., Qinhuangdao (China). State Key Lab. of Metastable Materials Science and Technology. Clean Nano Energy Center
- City Univ. of Hong Kong, Kowloon (Hong Kong). Dept. of Mechanical Engineering; City Univ. of Hong Kong Shenzhen Research Inst., Shenzhen (China). Center for Advanced Structural Materials
- Xiangtan Univ. (China). School of Materials Science and Engineering; Yanshan Univ., Qinhuangdao (China). State Key Lab. of Metastable Materials Science and Technology. Clean Nano Energy Center
- State Univ. of New York (SUNY), Binghamton, NY (United States). Dept. of Mechanical Engineering & Materials Science. Engineering Program
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. Finally, 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 Organization:
- State Univ. of New York (SUNY), Albany, NY (United States)
- Sponsoring Organization:
- National Key R&D Program of China; National Natural Science Foundation of China (NSFC); USDOE Office of Science (SC)
- Grant/Contract Number:
- SC0001135
- OSTI ID:
- 1850716
- Journal Information:
- Corrosion Science, Journal Name: Corrosion Science Journal Issue: C Vol. 177; ISSN 0010-938X
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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