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The potential offered by SiO(2)-rich scales in improving resistance to sulphidation attack in low oxygen-containing environments has been evaluated using a series of model 12% Cr and 12% Ni alloys with Si additions ranging from 1.5% to 4%. Tests have been carried out at 450 C in a non-equilibrated CO-rich gas of the type found in a dry-feed entrained slagging gasifier for durations of up to 2000 hours. The significant benefit conferred by the higher levels of Si in these steels is shown by both weight change measurements and surface and cross-sectional microstructural analysis.

Additional information

Authors: NORTON J F, JRC Petten (NL);MAIER M, JRC Petten (NL);BAKKER W T, Electric Power Research Institute, Palo Alto (US)
Bibliographic Reference: Paper presented: 13th International Corrosion Congress, Melbourne (AU); November 24-29, 1996
Availability: Available from (1) as Paper EN 40304 ORA
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