Abstract
Several tests were carried out, using various model and commercial alloys in order to simulate the hot corrosion behavior of gas turbine superalloys in their practical uses. These tests included: salt free oxidation, straight sulphidation in H2-H2S, crucible tests and salt coating. In addition, two new tests were performed: a modified Dean apparatus, and gas-phase mixing. The products of salt free oxidation and straight sulphidation tests did not produce, in any way, the results observed in practical situations, they only confirmed maintaining a certain level of chromium and/or aluminum in order to produce a corrosion resistant alloy. The crucible and salt coating tests were not capable of ranking the alloys in the same order as they appear in practice. The new tests seem ideal, and the reaction morphologies of the tested commercial alloys were, to a great extent, similar to those seen in practice. The last two tests helped in explaining the corrosion mechanism as a two-stage process, with an incubation period followed by initiation of reaction, after which the corrosion propagates rapidly.
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El-Dahshan, M.E. The simulating of hot corrosion behaviour of gas turbine materials by laboratory tests. JMES 2, 49–57 (1980). https://doi.org/10.1007/BF02833437
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DOI: https://doi.org/10.1007/BF02833437