Electrolytic Al2O3/Y2O3 double-layer coating on IN617 superalloy
| Autor: | C.T. Hsu, Cheng-Chung Chang, T.N. Chang, Shiow-Kang Yen |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Aqueous solution
Materials science Annealing (metallurgy) Scanning electron microscope Metallurgy Non-blocking I/O Surfaces and Interfaces General Chemistry Electrolyte engineering.material Condensed Matter Physics Surfaces Coatings and Films Corrosion Superalloy Coating Materials Chemistry engineering Nuclear chemistry |
| Zdroj: | Surface and Coatings Technology. 200:6611-6617 |
| ISSN: | 0257-8972 |
| DOI: | 10.1016/j.surfcoat.2005.11.111 |
| Popis: | In this study, IN-617 superalloy was coated with Al 2 O 3 /Y 2 O 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 2 SO 4 contained environment at 850 °C, and high temperature oxidation test at 1000 °C in air. The Y 2 O 3 /Al 2 O 3 double layer coating revealed the composite crystal structures of Y 2 O 3 , Al 2 O 3 and yttrium–aluminum garnet (YAG). Also YAG powders can be prepared by collecting and annealing the coating film. The Y 2 O 3 /Al 2 O 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 2 O 3. Also, it revealed more corrosion resistance in 3.5% NaCl aqueous solution and more hot corrosion resistance in Na 2 SO 4 contained environment at 850 °C. |
| Databáze: | OpenAIRE |
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