Sundaresan, C.Rajasekaran, B.Varalakshmi, S.Santhy, K.Rao, D.S.Govindarajan, G.2026-02-052021Corrosion Science, 2021, 189, , pp. -0010938Xhttps://doi.org/10.1016/j.corsci.2021.109556https://idr.nitk.ac.in/handle/123456789/23128Hot corrosion performance of Atmospheric Plasma Spray (APS) and Detonation spray (DSC) CoCrAlY, NiCoCrAlY, and NiCr coatings on T91 steel were investigated at 650 °C for 100 cycles under Na<inf>2</inf>SO<inf>4</inf>-K<inf>2</inf>SO<inf>4</inf>-Fe<inf>2</inf>O<inf>3</inf> mixed salt deposit in ambient air. The hot corrosion resistance of DSC coatings was found to be superior to their APS counterparts. Chromia and spinel oxides provided excellent corrosion resistance while no ?-Al<inf>2</inf>O<inf>3</inf> was observed. DSC NiCr and APS NiCoCrAlY offered the most and the least corrosion resistance, respectively. DFT calculation was performed to validate the thermodynamic stability of each oxide and identify the precise oxide formation. © 2021 Elsevier LtdAluminaAluminum oxideBinary alloysChromium steelCobalt alloysCorrosion resistanceCorrosion resistant coatingsDetonationHematiteHigh temperature corrosionNickel steelPlasma sprayingPotashSodium sulfateSprayed coatingsSteel corrosionThermodynamic stabilityA cobaltA metal coatingA nickelAtmospheric plasma sprayB SEMB XRDC hot corrosionCorrosion performanceHot corrosionNiCoCrAlY coatingsChromium alloys