In the present study, the bi-layer NiCrAlY/Al₂O₃-40%TiO₂ coating was deposited on the three substrates (A-1, T-91, & Superfer800H) by utilizing a plasma spray technique. NiCrAlY was used as a bond coat for ensuring a proper mechanical anchorage of the topcoat (Al₂O₃-40%TiO₂) on to it. The hot corrosion behavior of the coated as well as uncoated substrate was evaluated in an aggressive environment of Na₂SO₄-60%V₂O₅ molten salt at 900 C for 50 cycles (1 h of heating followed by 20 min of cooling at ambient temperature). Thermogravimetric analysis was done to establish the corrosion kinetics of the coated as well as the uncoated substrate. The surface morphology of the as-sprayed and corroded products was analyzed by using a scanning electron microscope (SEM) system, and various phases formed were analyzed by utilizing an x-ray Diffraction (XRD) apparatus. Iron oxide (Fe₂O₃) is the principal phase formed in the tested uncoated substrate which is non-protective in nature; whereas the presence of Al, and Ti oxides along with some minor oxides of Ni, and Cr were observed in the oxide scale of the tested coated substrate, which are protective and remain stable even at harsh environment condition. The weight gain shown by the coated substrate is less as compared to the uncoated substrate, which indicates the usefulness of the coating.

在本研究中，双层 NiCrAlY/Al ₂ O ₃ -40%TiO ₂涂层通过等离子喷涂技术沉积在三种基材（A-1、T-91 和 Superfer800H）上。NiCrAlY 用作粘合涂层，以确保面涂层 (Al ₂ O ₃ -40%TiO ₂ )适当机械固定在其上。在 Na ₂ SO ₄ -60%V ₂ O ₅的侵蚀性环境中评估了涂层和未涂层​​基材的热腐蚀行为熔盐在 900°C 下进行 50 个循环（加热 1 小时，然后在环境温度下冷却 20 分钟）。进行热重分析以建立涂层和未涂层​​基材的腐蚀动力学。使用扫描电子显微镜 (SEM) 系统分析喷涂和腐蚀产品的表面形貌，并使用 X 射线衍射 (XRD) 设备分析形成的各种相。氧化铁（Fe ₂ O ₃)是在测试的无涂层基材中形成的主要相，其本质上是非保护性的；而在测试涂层基材的氧化皮中观察到 Al 和 Ti 氧化物以及一些少量的 Ni 和 Cr 氧化物的存在，它们具有保护作用，即使在恶劣的环境条件下也能保持稳定。与未涂覆的基材相比，涂覆的基材显示的重量增加较少，这表明涂层的有用性。