Abstract
The corrosion behaviour of nickel and binary Ni-Cr alloys in helium containing small amounts of SO 2, H 2 and H 2O has been investigated. The main emphasis was placed on the behaviour of Ni-25Cr, at 850°C with the aim of studying the conditions under which a protective chromia layer is formed. To investigate the formation of a chromia layer and its destruction due to sulphidation, the gas/metal kinetics were measured quantitatively by semi-continuous gas chromatographic analysis of the gas components at the inlet and the outlet of the test chamber. The results obtained can be explained by assuming a direct reaction between the metal surface and the gas molecules SO 2, H 2O and H 2 rather than by classical equilibrium considerations involving equilibrium oxygen and sulphur partial pressures.
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