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Title: Effect of water vapor on high-temperature oxidation of NiAl alloy

Journal Article · · Corrosion Science
 [1];  [2];  [3];  [4];  [2];  [2];  [5];  [6]
  1. Xiangtan Univ. (China). School of Materials Science and Engineering; State Univ. of New York (SUNY), Binghamton, NY (United States)
  2. Xiangtan Univ. (China). School of Materials Science and Engineering
  3. Yanshan Univ., Qinhuangdao (China). State Key Lab. of Metastable Materials Science and Technology. Clean Nano Energy Center
  4. 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
  5. 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
  6. 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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