Performance of air plasma sprayed Cr3C2-25NiCr and NiCrMoNb coated X8CrNiMoVNb16-13 alloy subjected to high temperature corrosion environment

Abstract Thermal barrier coating plays a vital role in protecting materials’ surfaces from high-temperature environment conditions. This work compares the demeanour of uncoated and air plasma sprayed Cr 3 C 2 –25NiCr NiCrMoNb coated X8CrNiMoVNb16–13 substrates subjected to oxidation molten salt (Na SO 4 + 60%V O 5 ) condition at 900 °C for 50 cycles. Coating characteristics have been analyzed through microstructure, thickness, porosity, hardness, bond strength. SEM, EDS XRD analysis were used analyze corrosion’s product end 50th cycle. microstructures showed uniform laminar structure that is adherent denser with thickness 150 ± 20 μ m porosity less than 3.5%. The Microhardness both higher bare substrate. strength was 38.9 MPa 42.5 MPa. Thermogravimetric parabolic rate law all environments. In environment, exhibited weight gain compared environment. environmental conditions, alloy substrates. formation , NiO spinel oxide NiCr offers good resistance corrosion condition. However, presence Mo Nb significantly accelerated substrate, thereby increasing It observed over substrate protected against hot exposed similar