Hot corrosion of the ceramic composite coating Ni3Al–Al2O3–Al2O3/MgO plasma sprayed on 316L stainless steel
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Amir Khodaparast Shirazi
and Seyed Rahim Kiahosseini
Abstract
Ni3Al–Al2O3–Al2O3/MgO three-layered coatings with thicknesses of 50, 100, and 150 μm for Al2O3/MgO and 100 μm for the other layers were deposited on 316L stainless steel using plasma spraying. X-ray diffraction, atomic force microscopy, furnace hot corrosion testing in the presence of a mixture of Na2SO4 and V2O5 corrosive salts and scanning electron microscopy were used to determine the structural, morphological and hot corrosion resistance of samples. Results revealed that the crystalline grains of MgO and Al2O3 coating were very small. Weight loss due to hot corrosion decreased from approximately 4.267 g for 316L stainless steel without coating to 2.058 g. The samples with 150 μm outer coating showed improved resistance with the increase in outer layer thickness. Scanning electron microscopy of the coated surface revealed that the coating's resistance to hot corrosion is related to the thickness and the grain size of Al2O3/MgO coatings.
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© 2017, Carl Hanser Verlag, München
Articles in the same Issue
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Articles in the same Issue
- Contents
- Contents
- Review
- Current developments of biomedical porous Ti–Mo alloys
- Original Contributions
- Investigation of crystallization kinetics and deformation behavior in supercooled liquid region of CuZr-based bulk metallic glass
- Modeling of hardening and fracture behavior in Gr.65 steel after intercritical heat treatments
- Time evolution of agglomerate size of semisolid magnesium alloy AZ91D during a real isothermal shearing
- Effect of stirring speed on microstructure of A356 alloy cast through rheometal process
- Phase equilibria of the Mo–Al–Ho ternary system
- Experimental investigation of phase equilibria in the Zr–Cu–Ni ternary system
- Hot corrosion of the ceramic composite coating Ni3Al–Al2O3–Al2O3/MgO plasma sprayed on 316L stainless steel
- Tribological properties of B4C–TiB2–TiC–Ni cermet coating produced by HVOF
- Electrochemically fabricated Fe–Ni alloy nanowires and their structural characterization
- Short Communications
- Synthesis and growth mechanisms of ZrC whiskers fabricated by a VLS process
- DGM News
- DGM News