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This paper presents the results of a study in which two nickel-based superalloys, IN 738 and Udimet 720 have been exposed in H(2)-7%CO-1.5%H(2)O gas mixtures, containing varying H(2)S levels at 600 C, for periods up to 1000 hours. The oxygen and carbon activities have been kept constant, whilst the sulphur activity has been varied. The corrosion kinetics have been established using weight change measurements. The mechanisms of alloy degradation were studied using structural analysis techniques including X-ray diffraction, surface S.E.M. with E.D.A.X. and cross-sectional optical microscopy. The objectives have been to compare the nature and extent of the corrosive attack experienced by these alloys, to establish the importance of sulphur activity in these low oxygen-containing environments and also to relate the results of this experiment to thermodynamic predictions.

Additional information

Authors: SANTORELLI R, CISE SpA, Segrate (Mi) (IT);BREGANI F, ENEL-CRTN, Milano (IT);NORTON J F, JRC Petten Estab. (NL);CANETOLI S, JRC Petten Estab. (NL)
Bibliographic Reference: Paper presented: International Conference on "Evolution of Advanced Materials", Milano (IT), May 31-June 2, 1989
Availability: Available from (1) as Paper EN 34692 ORA
Record Number: 198910538 / Last updated on: 1994-12-01
Original language: en
Available languages: en
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