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98428 CORROSION OF Fe, Ni, Cr AND THEIR ALLOYS IN SIMULATED MUNICIPAL WASTE INCINERATION CONDITIONS

Picture for 98428 CORROSION OF Fe, Ni, Cr AND THEIR ALLOYS
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Product Number: 51300-98428-SG
ISBN: 98428 1998 CP
Author: F. Soutrel, C. Rapin, P. Steinmetz, G. Pierotti
Industry: Materials Selection and Design
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One limitation in MSW incineration process is with the degradation of metallic parts (tubes), which can be very severe in the plants, because of the high level of corrosive gases (HCl and S02 ). Rather than using very resistant but very expensive alloys to make waterwall and superheater tubes, it can be interesting to apply coatings to carbon steels. The problem is however to find the better combination of elements compatible with the substrate and the long term resistance to corrosion. Individual components of coating alloys (Iron, Nickel, Chromium) and also binary alloys (Fe-Cr, Ni-Cr) which can be used to coat metallic parts, have been tested in simulated waste environment (ash, air+HCl+S02, 500”C). Corrosion kinetics and mechanisms could be identified with use of thermogravimetry and with characterisation of the corrosion products (XRD, SEM, Electron Microprobe and DSC), Alkaline components present in the ash have a determining influence on the corrosion processes. This result could be correlated to the difference between the thermodynamic properties of complex oxides formed with sodium or potassium (A G, melting temperature, etc...). Keywords : waste incineration, Fe, Ni, Cr, Alloys, corrosion mechanisms, chlorides ashes, HCl, SO,.
One limitation in MSW incineration process is with the degradation of metallic parts (tubes), which can be very severe in the plants, because of the high level of corrosive gases (HCl and S02 ). Rather than using very resistant but very expensive alloys to make waterwall and superheater tubes, it can be interesting to apply coatings to carbon steels. The problem is however to find the better combination of elements compatible with the substrate and the long term resistance to corrosion. Individual components of coating alloys (Iron, Nickel, Chromium) and also binary alloys (Fe-Cr, Ni-Cr) which can be used to coat metallic parts, have been tested in simulated waste environment (ash, air+HCl+S02, 500”C). Corrosion kinetics and mechanisms could be identified with use of thermogravimetry and with characterisation of the corrosion products (XRD, SEM, Electron Microprobe and DSC), Alkaline components present in the ash have a determining influence on the corrosion processes. This result could be correlated to the difference between the thermodynamic properties of complex oxides formed with sodium or potassium (A G, melting temperature, etc...). Keywords : waste incineration, Fe, Ni, Cr, Alloys, corrosion mechanisms, chlorides ashes, HCl, SO,.
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ISBN: 98413 1998 CP
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