Several Ni and Fe base alloys were tested in a simulated flue gas environment at 500°C, 550°C, and 650°C. To mimic the effect of ash deposit, the specimens were coated with slurry containing heavy
metal and alkali metal chlorides. The exposed materials were examined for mass change and depth of attack by microscopic corrosion depth measurements to evaluate general and localized corrosion attack.
Results indicate that Ni, Cr and Mo are beneficial for corrosion resistance. Several Ni-Cr-Mo-W experimental alloys were also tested under the same environmental conditions. These alloys were tested
in the wrought and weld overlay forms to evaluate the effect of microstructure, chemical composition, and residual stress. The observed trends are discussed with reference to the available literature.