Abstract
High temperature corrosion by chlorides and siloxanes, common impurities in waste incinerators, was investigated. A model alloy Fe-30Cr (wt%) exposed to Ar-10 H2O and Ar-10 H2O-0.1HCl mixtures (vol%) at 650 °C formed protective Cr2O3 scales. Contaminating the reaction gases by siloxanes resulted in an amorphous (Cr,Si)Ox scale layer in Ar-10 H2O-0.1HCl and a polycrystalline, Si-rich Cr2O3 scale in Ar-10 H2O. Mass transfer calculation showed the feasibility of Si supply from the vaporisation of siloxanes. The co-effect of HCl and siloxanes on amorphous oxide scale formation is discussed based on oxidation of co-deposited volatile Cr and Si species.
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