Discontinuous oxidation and erosion-oxidation of a CeO2-dispersion-strengthened chromium coating

A CeO2-dispersion-strengthened chromium coating was developed on a carbon steel using a two-step process: prior electrodeposition of a Ni-CeO2 nanocomposite film and subsequent chromization using a conventional pack cementation method. Compared to the CeO2-free coatings prepared on the carbon steel without and with pre-electrodeposition of a pure Ni film, the CeO2 dispersed chromium coating offered profoundly improved discontinuous oxidation resistance at 900 °C in 5% O2 + N2 and in 5% O2 + 1000 ppm SO2 + N2, and erosion-oxidation resistance in a laboratory-scale fluidized-bed combustor (FBC), mainly because of the development of a denser, less wrinkled and more adherent chromia scale.