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Based on the results of thermochemical analysis, NH 4 I+NH 4 Cl proved to be a more favorable activator for codepositing Co–Al–Y compared to NH 4 I or NH 4 Cl. Coating deposition experiments were also demonstrated that codeposition of Co–Al–Y with high concentration of Co and minute quantities of Y could be achieved at 1323K in the NH 4 I+NH 4 Cl activated...
The microstructure and corrosion behavior was studied for a Co modified NiAl coating formed on the superalloy DZ125 by pack cementation process. The hot corrosion kinetics showed that the mass gain of the coated specimen was three orders of magnitude lower than that of the uncoated specimen at 1173K up to 100h. The corrosion product formed on the surface of the coating mainly consisted of a protective...
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