High temperature steam oxidation resistance of aluminide coatings obtained on 9-12% Cr ferritic-martensitic steels, which have been developed by chemical vapour deposition in fluidized bed reactor (CVD-FBR) using a bed modified with Zr particles, is presented here. The resulting coatings composed of (Fe,Cr)(2)Al(5) intermetallic phase provide a high temperature steam oxidation resistance, which depends on the oxidation temperature. At 650 degrees C, after 1000 h of exposure, the alumina formed on the surface acts as a protective barrier. However, when the oxidation temperature increases up to 800 degrees C, the alumina scale fails before 1000 h of exposure giving rise to the formation of the Cr(2)O(3) and (Fe,Mn)(3)O(4), due to the high atomic diffusion rate at this temperature. (C) 2009 Elsevier B.V. All rights reserved.