The early-stage oxidation kinetics of CeO[sub 2] sol-coated nickel

Journal Article · Wed Sep 01 04:00:00 EDT 1993 · Journal of the Electrochemical Society; (United States)

DOI:https://doi.org/10.1149/1.2220871· OSTI ID:5631013

Czerwinski, F; Smeltzer, W W ^[1]

---

1. McMaster Univ., Hamilton, Ontario (Canada). Inst. for Materials Research

CeO[sub 2] sol with particle diameter of 5 nm was applied to the surface of both chemically and mechanically polished polycrystalline nickel. The oxidation kinetics during early stages of NiO formation have been measured with an ultrahigh vacuum manometric system in the temperature range of 873 to 1073 K and oxygen pressure 5 [times] 10[sup [minus]3] Torr. The ceria coatings reduced the nickel oxidation rate by up to a factor of 4, but the extent of the effect depended on coating thickness, substrate surface finish, and preoxidation prior to coating. After oxidation the Auger electron spectroscopy sputter profiles revealed the cerium concentration maximum in the vicinity of the gas-oxide interface. As was determined by scanning and transmission electron microscopy, ceria coatings resulted in formation of more uniform oxide films, with grain size much smaller than that observed on pure nickel. Ceria particle with diameter less than 10 nm were detected both inside nickel oxide grains and at oxide grain boundaries.

• OSTI ID: 5631013
• Journal Information: Journal of the Electrochemical Society; (United States), Journal Name: Journal of the Electrochemical Society; (United States) Vol. 140:9; ISSN JESOAN; ISSN 0013-4651
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
CERIUM COMPOUNDS
CERIUM OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
COATINGS
CORROSION RESISTANCE
DATA
DIMENSIONS
ELEMENTS
EXPERIMENTAL DATA
INFORMATION
INTERFACES
METALS
NICKEL
NUMERICAL DATA
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PARTICLE SIZE
PROTECTIVE COATINGS
RARE EARTH COMPOUNDS
SIZE
THICKNESS
TRANSITION ELEMENTS