Effect of CeO2 dispersion on the oxidation behavior of Ni-Al/Ni-Re coating in dry and wet CO2 gas at 650 °C

Abstract A CeO2-dispersed nickel-aluminide coating was deposited by aluminizing a Ni-CeO2 electroplating film with a Ni-Re interlayer pre-electroplated sequentially. The CeO2-dispersed coating was exposed to dry and wet CO2 gas at 650 °C for 1300 h. Internal oxidation and cavities were observed in the coating centralized around CeO2 particles, which became more aggravated with the presence of H2O in CO2 gas. The activity of CeO2/Ni2Al3 interface for CO2 and H2O dissociation and oxygen diffusion was studied by first-principle calculations. The effect of CeO2 dispersion on the coating oxidation in dry and wet CO2 gas was discussed.