4.7 Article

An approach to improve the oxidation resistance of a Ni-28W-6Cr alloy by hindering the oxygen vacancy-mediated oxidation

期刊

CORROSION SCIENCE
卷 187, 期 -, 页码 -

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2021.109480

关键词

Nickel; Superalloys; Modeling studies; AFS; Oxidation; High temperature corrosion

资金

  1. National Key Research and Development Program [2017YFA0402803, 2016YFB0700404]
  2. Youth Innovation Promotion Association CAS [2020260]
  3. Science and technology innovation 2025 Key Project of Ningbo City [2019B10084]
  4. National Natural Science Foundation of China [51601213, 52071331]
  5. Strategic Priority Research Program of the Chinese Academy of Sciences [XDA02004210]

向作者/读者索取更多资源

The study demonstrates that doping zirconium into Ni-28W-6Cr alloys can significantly improve the oxidation resistance of the alloy by reducing the oxidation rate and inner oxide thickness, as Zr charged +4 prefers to segregate in the inner NiWO4, inhibiting oxygen vacancies formation and reducing oxygen diffusion pathways.
In this work, an approach to improve the oxidation resistance of a Ni-based alloy was proposed by doping a high valence metal element into the oxides. Oxidation kinetics of Ni-28W-6Cr alloys with 0-0.2 wt.% Zr at 850 degrees C show that Zr can significantly decrease the oxidation rate of the alloy and the thickness of the inner oxide. Zr charged +4 prefers to segregate in the inner NiWO4 by replacing Ni2+, which inhibits the formation of oxygen vacancies and reduces the oxygen diffusion pathways, improving the oxidation resistance of the alloy.

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