Abstract
The corrosion of Ni based superalloys IN 738, IN 792, UD 720 and MA 6000 in gaseous atmospheres were studied at three temperatures: 800 OC, 950 OC and 1100 O C . The corrosive atmospheres, simulating the composition of combustion gases of turbines, were highly oxidizing (Ar + 10% 0 2 ) and contained low amounts of SO2. The effect of an anticorrosive coating, of the type MCrAIY, was studied in corrosion tests of coated and uncoated specimens. Weight change measurements, together with SEM analysis were used to determine the extent and morphology of the corrosion. The effect of the MCrALY coating was to reduce the extent of the corrosion due to the formation of a protective AI2o3 layer.
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