The effects of CeO2 coatings on high-temperature oxidation of Co, Ni and Cu have been
investigated as a function of temperature at oxygen pressures from 1 104 to 1 atm. The
oxidation mechanisms for Co and Cu are essentially unaffected by CeO2 coatings, whereas the
oxidation rate of Ni decreases by approximately one order of magnitude. The oxygen pressure
dependence does not change markedly with CeO2 coatings for any of the metals studied. For
oxidation of Ni plus CeO2 coatings, the temperature dependence is less marked at lower
temperatures, whereas essentially the same behavior is observed for Co and Cu with and
without the coating. Differences in the effects of CeO2 coatings for the three metal systems
have been attributed to the relative influence of grain boundary transport on the overall rates
of oxidation. 2002 Elsevier Science Ltd. All rights reserved.