High temperature corrosion behaviour of superalloys under actual waste incinerator environment

• This study reported corrosion behaviour of alloys in medical waste incinerator.
• SEM and XRD were used for characterization of corrosion products.
• Corrosion mechanism was proposed for all the three alloys.

In the present study, three superalloys viz. Superni 718, Superni 600 and Superco 605 were hung inside the secondary chamber of actual medical waste incinerator where the temperature is more than 1050 °C. Burning of medical waste produces very corrosive environment at high temperature which can degrade the components of construction. Hence the three superalloys were kept for 1000 h inside the chamber. Corrosion rate has been calculated in mpy. Corrosion products so produced were characterized using SEM/EDS and XRD technique. It was observed that both the Nickel based superalloys showed better corrosion resistance than the cobalt based superalloy under the given environment.