Madhu Sudana Reddy, G.Prasad, C.D.Patil, P.Shetty, G.Ramesh, M.R.Nageswara Rao, T.2026-02-042022Engineering Research Express, 2022, 4, 2, pp. -https://doi.org/10.1088/2631-8695/ac7946https://idr.nitk.ac.in/handle/123456789/22536The present work investigates the hot corrosion behavior of thermally sprayed 65 pct NiCrAlY + 35 pct TiO2 and 65 pct NiCrAlY + 30 pct Cr2O3 + 5 pct YSZ coatings on titanium 15 alloys. The coatings on the titanium 15 alloy substrates exhibit a near-uniform, dense, and adherent microstructure with a porosity of 2.7 to 2.9%. Thermogravimetric studies are made to examine the hot corrosion performance of coatings in a molten salt environment of Na2SO4 + 60%V2O5 at the temperature of 700 °C for 50 cycles. One cycle is carried out by heating for a period of one hour and cooling the sample at ambient conditions. The corrosion products are analyzed based on scanning electron microscopy, energy dispersive analysis, and X-ray diffraction techniques to study the morphology, phase composition, and abundance of the high-temperature corrosion constituents. The bare titanium-15 alloy, 65 pct NiCrAlY + 35 pct TiO2 coating and 65 pct NiCrAlY + 35 pct Cr2O3 + 5 pct YSZ coating produced a weight gain of 307.92 mg cm-2, 42.16 mg cm-2 and 44.02 mg cm-2 respectively after the period of 50 cycles. The effective resistance of the coatings is due to the formation of Ni3V2O8, NiCr2O4, Cr2O3 & AlV2O4 phases. © 2022 IOP Publishing Ltd.Composite coatingsCorrosion resistant coatingsCorrosive effectsHigh temperature corrosionMorphologyPlasma sprayingScanning electron microscopySodium sulfateSprayed coatingsThermal barrier coatingsTitanium alloysVanadium pentoxideYttria stabilized zirconiaAlloy substratesCermet composite coatingCorrosion behaviourHot corrosionNi-based coatingsPlasma spray coatingThermogravimetric studiesTitaniaTitanium (alloys)YSZ coatingsTitanium dioxide