Abstract
The present study is to investigate the isothermal oxidation behavior of Inconel 718 (a Cr/Ni/Mo/Si-based alloy) because of their excellent thermo-mechanical properties, which are important in aerospace applications. X-ray diffraction (XRD) study confirmed the formation of spinel element of NiCr2O4 along with Cr2Ni3 at 1000 °C. X-ray photoelectron spectroscopy (XPS) is used to define the elemental composition of oxides and Raman spectroscopy to ascertain the state of oxides. Different morphologies such as tetragonal biaxial pyramids, flakes, and polygonal plates were observed on heated samples. Cross-sectional and EDS studies clearly revealed the drastic increase of oxide layer from 800 °C to 1200 °C. Finally, electrochemical impedance spectroscopy (EIS) analysis was carried out at 800 °C, 1000 °C and 1200 °C with a tenant period and ramping rate of 24 h and 10 min respectively. The EIS results divulged that charge transfer resistance values drastically increased with increasing temperature due to oxide layer.
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