TWA 8
Hot Salt Corrosion Resistance
Hot salt corrosion problems arise in gas turbines operating in marine environments as a consequence of ingested salt combining with sulphur present in the fuel during combustion. This TWA was set up to harmonise known test procedures and develop an internationally acceptable procedure for assessing the hot salt corrosion resistance of superalloys used in gas turbines.
In earlier round-robin tests by ASTM in the United States and in an intercomparison exercise under COST 50 in Europe, metal loss varied by up to a factor of 16 at 900 °C, which indicated that there was considerable scope to devise a test procedure that would enable consistent results to be obtained.
A round robin conducted in which burner rig conditions were controlled by the use of the same contaminant flux level achieved much better agreement and the scatter was reduced to a factor of two. Tests at the lower temperature of 700 °C showed greater scatter, as did tests with coated samples.
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