Corrosion of candidate heat exchanger alloys in complex simulated coal gasification atmospheres at 450 C
In 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 to the alloy substrate. In this study, the corrosion behaviour 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 from 1.3 to 4%. Two higher Cr-Ni austenitic alloys (25% Cr-20% Ni and 20% Cr-32% Ni), have also been tested. Coupons from each material have been exposed to a non-equilibrated CO-based gas mixture containing 0.8% H(2)S for up to 2000 hours. Weight change measurements and surface and cross-sectional examinations have been used to establish the kinetics, morphology, type and extent of corrosive degradation.
Bibliographic Reference: Paper presented: Corrosion'97, New Orleans (US), March 9-14, 1997
Availability: Available from (1) as Paper EN 40309 ORA
Record Number: 199710265 / Last updated on: 1997-04-01
Original language: en
Available languages: en