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

A CeO(2)-dispersion-strengthened chromium coating was developed on a carbon steel using a two-step process: prior electrodeposition of a Ni-CeO(2) nanocomposite film and subsequent chromization using a conventional pack cementation method. Compared to the CeO(2)-free coatings prepared on the carbon steel without and with pre-electrodeposition of a pure Ni film, the CeO(2) dispersed chromium coating offered profoundly improved discontinuous oxidation resistance at 900 degrees C in 5% O(2) + N(2) and in 5% O(2)+ 1000 ppm SO(2) + N(2), 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. (C) 2010 Elsevier Ltd. All rights reserved.