A novel CeO2-modified low-temperature aluminized coating was fabricated on a nanostructured Ni-CeO2 composite film （the mean grain size of Ni grains ：60 ±38nm）,which was deposited on an A3 steel by co-electrodeposition of Ni and CeO2 nanoparticles from a nickel sulfate bath,and then aluminized by using a conventional halide-activated pack cementation method but at 600℃ for 5 h. An electrodeposited Ni- film-coated A3 and a bare A3 were aluminized under the same condition for comparison. The three aluminized coatings were exposed in a laboratory-scale fluidized-bed combustor （FBC） for 100 h in a temperature range of 550 - 850℃, The result showed that the CeO2-dispersed aluminized coating exhibited the best oxidation-erosion resistance ,due to that it had the hardest surface and maintained the growth of an adherent alumina scale, in contrast, alumina scales formed on the other two aluminized coatings had exhibited a severe cracking and spalling susceptibility, causing a complete degradation of aluminide phases.
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