J. M. Guilemany, M. Torrell, J. R. Miguel, Thermal Spray Center. University of Barcelona, Barcelona, Spain
High temperature corrosion causes an important problem in Municipal Solid Waste Incinerator plants (MSWI). This work shows a possible solution for this problem through High Velocity Oxygen Fuel (HVOF) thermal spray coatings. A comparison between powder and wire thermal spray coatings with the same composition has been done. These optimised coatings have been compared through their microstructure, wear properties (ASTM G99-90, ASTM G65-91), and erosion-corrosion (E-C) resistance. Results of the different E-C tests designed in the Thermal Spray Centre, has been evaluated by X Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS). Bulk material with similar composition of Ni Based coatings has also been tested. The protection mechanisms of these materials have been assessed after studying the results obtained for HVOF coatings and bulk material. Ni based HVOF coatings are a promising alternative to the MSWI protection against chloride environments.
Summary: The protection of exchange tubes of Solid Waste Incinerator plants by Ni based High Velocity Oxygen Fuel Thermal Spray coatings. Comparison between wire and powder sprayed coatings. Protection mechanisms of this kind of materials.
