Protective effect of coatings on the corrosion behaviour of Ni based superalloys in gas turbines atmospheres
The corrosion of Ni based superalloys IN 738, IN 792, UD 720 and MA 6000 in gaseous atmospheres was studied at three temperatures: 800 C, 950 C and 1100 C. The atmospheres simulated the composition of combustion gases of turbines and were highly oxidising. The effect of an anticorrosive coating, of the type MCrAlY, 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 Al(2)O(3) layer.
Bibliographic Reference: Article: Journal de Physique IV, Vol. 3 (1993) pp. 569-578
Record Number: 199411131 / Last updated on: 1994-11-25
Original language: en
Available languages: en