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The corrosive attack experienced by engineering alloys exposed in multi-reactant gaseous atmospheres containing sulphidising, oxidising and carburising species is an area of major concern in a coal conversion plant. Sulphidation can be a significant problem for metallic components, such as heat exchangers, which are required to operate for extended periods in low oxygen-containing process environments. An extended study was carried out on a series of commercial austenitic Fe-Cr-Ni alloys, as well as on a simpler laboratory-cast "model" alloy. The main objective was to establish the influence of varied sulphur activity on corrosion behaviour, whilst keeping the oxygen and carbon activities constant. An H(2)-CO-H(2)O gas mixture was used as a reference environment and H(2)S was added in quantities ranging from 0.06% to 2.0%. This paper presents the results obtained and describes both the kinetics and mechanisms by which these alloys corrode, over test durations ranging from a few minutes up to 5000h. The roles of alloy composition and surface condition were also studied, and the influence of various environmental parameters upon the threshold existing between oxidation-governed kinetics and the catastrophic sulphidation regime were elucidated.

Additional information

Authors: NORTON J F, JRC Petten (NL);KNEESHAW J A, JRC Petten (NL)
Bibliographic Reference: Article: Res Mechanica, Vol. 31 (1990) pp. 285-328
Record Number: 199110637 / Last updated on: 1994-12-02
Original language: en
Available languages: en