Abstract
The corrosive degradation of alloys exposed to complex gaseous atmospheres typical of those encountered, for example, in advanced coal-conversion plant such as gasifiers and fluidised bed combustors, has prompted considerable research designed to assess alloy performance in multi-reactant environments. The behaviour of materials in atmospheres with low oxygen levels and containing both carbon and sulphur as additional reactants is particularly important.
This paper summarises the results of studies in which two commercial alloys plus a simple laboratory-cast “model” alloy have been exposed to a range of H2-CO-H2O-H2S gas mixtures at 800°C. The oxygen and carbon activities have been kept constant (pO2 = 10−21 bar, ac = 0.3) whilst the influence of varying the sulphur activity has been studied in a systematic manner at levels of pS2 = 10−9 to 10−8 bar, (H2S contents of 0.2 % to 0.6 %).
The commercial materials selected for these investigations have been 25Cr-35Ni alloys HP40Nb and HP40A1, containing Nb without and with Al respectively. It has been possible during these studies to examine the contribution of both major and minor elements in influencing the corrosion resistance from both kinetic and mechanistic view-points.
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© 1987 ECSC, EEC, EAEC, Brussels and Luxembourg
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Norton, J.F., Kneeshaw, J.A. (1987). The Influence of Alloy Composition Upon the Corrosion Behaviour of 25cr-35ni-Fe Alloys Exposed to Mixed Gaseous Oxidising/Sulphidising/Carburising Atmospheres. In: Marriott, J.B., Merz, M., Nihoul, J., Ward, J. (eds) High Temperature Alloys. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-1347-9_17
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DOI: https://doi.org/10.1007/978-94-009-1347-9_17
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-010-7099-7
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