Abstract Stellite-6 (Co-based) and NiAl coatings (Ni-based) were deposited via HVOF spraying onto 304 stainless steels tested in a 20 kWth biomass fired bubbling fluidised bed (BFB) combustor for 20 h an industrial scale anthracite CFB boiler 1630 h. showed excellent corrosion resistance both combustion systems because of the formation outermost Cr2O3 layer spinel CoCr2O4 beneath, whereas coati...