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MODELLING OF HOT CORROSION RESISTANCE OF INCONEL 718 COATED BY SIMULTANEOUS -YTTRIUMDOPED ALUMINIZING SILICONIZING PROCESS

Yttrium-doped aluminizing-siliconizing diffusion coatings were deposited on Superni 718 (Inconel 718) alloy. Hot corrosion studies were conducted on coated specimens in different salts (Na2SO4, NaCL, and V2O5) at temperatures range (800-900°C) under cyclic conditions. A series of experiments is performed on the four hot corrosion kinetics parameters (Na2SO4, NaCL, V2O5, and Temperature) to investigate their effect on the hot corrosion resistance. To stud the interaction among the factors a half factorial or fractional factorial experiments approach has been adopted. The hot corrosion resistance model was formulated based on Analysis of Variance (ANOVA) using Minitab statistical package. The outcome is represented graphically and in the form of empirical model which defines the hot corrosion kinetics of Inconel 718.