Inconel 625 is utilised in both biomass and waste incineration plants in Denmark. In both
cases, the performance is good however the morphology of corrosion attack is different which
indicates different corrosion mechanisms. In waste incineration plants there is general attack and
shallow pitting, and in some cases dendritic attack especially on the fins of waterwalls. The
dendritic attack is in the dendritic core. The presence of pits or dendritic attack is linked to the
temperature of the metallic surface and the molten salt composition. In a woodchip biomass plant,
chromium depletion was observed on the surface of the weld overlay leaving behind a nickel and
molybdenum rich porous structure. The corrosion attack was not related to the dendritic
microstructure of the weld. In two straw-fired biomass plants, co-extruded Sanicro 63 (alloy 625
type) as well as Inconel 625 weld overlay revealed the same type of attack, again chromium
depletion. This indicates that the corrosion mechanism in woodchip and straw power plants are
similar. Another interesting result in straw-fired boilers was that Nibas welds (alloy 625
composition) could provoke excessive corrosion in adjacent 18-8 stainless steels indicating a
galvanic reaction. The corrosion mechanisms observed in each case are discussed in relation to
temperature and corrosive environment.
