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Two series of experiments were performed at 600 C and 800 C, using two H(2)-based gas mixtures containing CO (7%) and H(2)O (1.5%) and with H(2)S additions of 0.2% and 2.0% with relevance to coal gasification environments. The materials studied were AISI 310, UD 720 and IN 738, with further alloys being added during the higher temperature test, i.e. HP40Al, FeCrAlloy and MA 956. The total duration of each test was 1000 hours. In order to establish the kinetics and the mechanisms governing the corrosion processes, gravimetric curves were obtained using discontinuous weight change measurements. In addition, selected specimens were removed at 100, 500 and 1000 hours for X-ray diffraction, surface SEM-EDS and cross-section OM analyses. The corrosion kinetics obeyed a parabolic law, enabling the rate constants of the alloys to be compared for the different environments. It was thereby possible to establish and quantify the influence of several of the important variables, such as alloy composition, sulphur content and temperature upon the corrosion behaviour.

Additional information

Authors: SANTORELLI R, JRC Petten (NL);NORTON J F, JRC Petten (NL);BREGANI F, JRC Petten (NL)
Bibliographic Reference: Paper presented: 11th International Corrosion Congress, Firenze (IT), April 2-6, 1990
Availability: Available from (1) as Paper EN 35089 ORA
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