Abstract
In this study, IN-617 superalloy was coated with Al 2O 3/Y 2O 3 double-layer films by electrolytic deposition in Al(NO 3) 3 and Y(NO 3) 3 aqueous solutions. Characterization of coated specimens was conducted by thermo-gravitational analysis (TGA), X-ray diffraction (XRD), scanning electron microscopy (SEM), aqueous corrosion tests in 3.5% NaCl, hot corrosion test in 2 mg/cm 2 Na 2SO 4 contained environment at 850 °C, and high temperature oxidation test at 1000 °C in air. The Y 2O 3/Al 2O 3 double layer coating revealed the composite crystal structures of Y 2O 3, Al 2O 3 and yttrium–aluminum garnet (YAG). Also YAG powders can be prepared by collecting and annealing the coating film. The Y 2O 3/Al 2O 3 coating film revealed the efficient retarding effects on the oxidation (NiO) of In617 superalloy in air at 1000 °C, since the coating film prohibited the formation of NiO and promoted the growth of Cr 2O 3. Also, it revealed more corrosion resistance in 3.5% NaCl aqueous solution and more hot corrosion resistance in Na 2SO 4 contained environment at 850 °C.
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