Steady-state growth of NiO scales on ceria-coated polycrystalline nickel

Journal Article · Sun Sep 01 04:00:00 EDT 1996 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1.1837139· OSTI ID:404645

Czerwinski, F; Szpunar, J A ^[1]; Smeltzer, W W ^[2]

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1. McGill Univ., Montreal, Quebec (Canada). Dept. of Metallurgical Engineering
2. McMaster Univ., Hamilton, Ontario (Canada). Inst. for Materials Research

The effect of CeO{sub 2} ceramic coatings with thicknesses in the range of 14 to 42 nm on the oxidation of high purity polycrystalline nickel at 973 K in 1 atm O{sub 2} has been studied. The ceria coatings decrease the Ni oxidation rate after 125 h by a factor up to 45, which is significantly higher than the reduction achieved during early stages. Growth features, including oxide thickness, surface morphology, and the texture for both the pure and CeO{sub 2} modified NiO, demonstrate a definite dependence on the crystallographic orientation of the Ni substrate. Oxides with thicknesses of up to 1 {micro}m developed on CeO{sub 2}-coated Ni consisted of three sublayers. The Ce-rich part, composed of small NiO grains and CeO{sub 2} particles, was located inside the scale and shifted deeper into the scale with increased oxidation time. The growth kinetics and microstructural evolutions of modified NiO are discussed in terms of the mechanism of inhibition of grain boundary diffusion in NiO by Ce{sup +4} ions.

• Sponsoring Organization: USDOE
• OSTI ID: 404645
• Journal Information: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 9 Vol. 143; ISSN JESOAN; ISSN 0013-4651
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CERIUM OXIDES
CORROSION PROTECTION
CRYSTAL GROWTH
MICROSTRUCTURE
NICKEL
NICKEL OXIDES
PROTECTIVE COATINGS
SURFACE COATING