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97144 CORROSION OF CANDIDATE HEAT EXCHANGER ALLOYS IN COMPLEX SIMULATED COAL GASIFICATION ATMOSPHERES AT 450°C

Picture for 97144 CORROSION OF CANDIDATE HEAT EXCHANGER
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Product Number: 51300-97144-SG
ISBN: 97144 1997 CP
Author: J. F. Norton, M. Maier, W. T. Bakker
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In CO-rich coal gasification atmospheres, sulfidation attack of metallic components can cause severe wastage problems. In these highly reducing environments, Si is one of the elements with a high enough affinity for oxygen to enable a silica-rich scale to be formed which may provide reasonable protection of the alloy substrate, In this study, the corrosion behavior of a commercial 12%Cr ferritic alloy is compared with the resistance of a series of specially cast 12%Cr and 12%Cr-12%Ni “model” alloys having Si levels ranging ffom 1.3 to 4 %.Two higher Cr-Ni austerritic alloys (25%Cr-20%Ni and 20%Cr-32%Ni) have also been tested. Coupons from each material have been exposed to a nonequilibrated CO-based gas mixture containing 0.8% H2S for up to 2000 hours. Weight changes and surface and cross-sectional examinations have been used to measure the kinetics and establish the morphology, type and extent of corrosive degradation. Keywords: Corrosion, sulfide scales, Si additions, 12%Cr alloys, non-equilibrated CO-richgases
In CO-rich coal gasification atmospheres, sulfidation attack of metallic components can cause severe wastage problems. In these highly reducing environments, Si is one of the elements with a high enough affinity for oxygen to enable a silica-rich scale to be formed which may provide reasonable protection of the alloy substrate, In this study, the corrosion behavior of a commercial 12%Cr ferritic alloy is compared with the resistance of a series of specially cast 12%Cr and 12%Cr-12%Ni “model” alloys having Si levels ranging ffom 1.3 to 4 %.Two higher Cr-Ni austerritic alloys (25%Cr-20%Ni and 20%Cr-32%Ni) have also been tested. Coupons from each material have been exposed to a nonequilibrated CO-based gas mixture containing 0.8% H2S for up to 2000 hours. Weight changes and surface and cross-sectional examinations have been used to measure the kinetics and establish the morphology, type and extent of corrosive degradation. Keywords: Corrosion, sulfide scales, Si additions, 12%Cr alloys, non-equilibrated CO-richgases
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