Oxidation Behavior of Fe-36Ni and Fe-46Ni Alloy Scraps

Oxidation study of Fe-36Ni and Fe-46Ni alloys was conducted on the effect of temperature under a 0.2 atm oxygen partial pressure. The weight of both specimens was continuously measured by TGA (thermogravimetric apparatus) at various temperatures and it was found that the weigh was gained with an increase of temperature. The oxidation behavior of Fe-36/46Ni alloys was found to be followed by parabolic rate law and the rate constants were linearly proportional to the temperature. In addition, activation energies of Fe-36Ni and Fe-46Ni alloys were calculated to be 106.49 kJ/mol and 58.99 kJ/mol, respectively. The cross sectional area of oxide scale was examined by SEM (scanning electron microscopy) and analyzed by XRD (X-ray diffraction) and EDX (energy-dispersive X-ray spectroscopy).