Abstract
Corrosion by molten phases leads to severe corrosion of heat exchangers in waste-to-energy plants. In addition, the presence of heavy metal chlorides in ash deposit increases degradation at low temperature due to the formation of highly corrosive molten phases. In this study, two heat exchanger materials, a low alloy steel (16Mo3) and a nickel based alloy (Inconel 625) were exposed in air to three different synthetic ashes, with various chloride contents, including ZnCl2 at isothermal temperatures of 450 and 650 °C in a muffle furnace. After the test, thickness and mass losses were evaluated on two separate samples, and metallographic cross sections of the specimens were characterized via SEM/EDX analyses. Both measurement results were in good agreement and showed that the corrosion observed on both materials was higher in the presence of zinc chloride in ash at 450 °C than in ashes without heavy metal chloride at 650 °C.
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Acknowledgments
This work has been supported by the French National Research Agency with project ANR SCAPAC 11-RMNP-0016 in partnership with, AIR LIQUIDE, SEDIS and CIRIMAT/ENSIACET. The authors thank L. ARANDA of Institut Jean Lamour, Nancy (France) for carrying out TMA and DTA analyses.
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Schaal, E., David, N., Panteix, P.J. et al. Effect of Zinc Chloride in Ash in Oxidation Kinetics of Ni-Based and Fe-Based Alloys. Oxid Met 85, 547–563 (2016). https://doi.org/10.1007/s11085-016-9612-5
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DOI: https://doi.org/10.1007/s11085-016-9612-5