Oxidation and Hot Corrosion Behaviour of Cr3C2 25 (Ni20Cr) Thermal Spray Coating

High temperature oxidation and corrosion represents the most maleficent forms of
surface degradation, which leads to the loss of mechanical strength and disastrous
failure of structural and engineering components. They are generally encountered in
materials used in turbines and aero engines, which operate in high temperature and
corrosive environments. Due to extensive employment of these materials, the high
temperature oxidation and corrosion behaviour has been the subject of intense
investigation for the past several years. Therefore, the present study investigates the
oxidation and hot corrosion behaviour of Cr3C2 25 (Ni20Cr) thermal spray coating
on Austenitic stainless steels (AISI 304) exposed to extreme corrosive (Na2SO4)
environment, at 900 oC. HVOF (High Velocity Oxy-Fuel) method will be used to
apply coating on the surface of substrate material. The weight change measurements
made on the substrate during the experiments will be used to determine the kinetics
of oxidation and hot corrosion. Surface structure and morphology will be evaluated
using X-ray diffraction (XRD), X-ray mapping and field emission scanning electron
microscope (FESEM).