Abstract
Isothermal oxidation kinetic studies on electrolytic grade iron as well as Fe-Cr alloys using different linear heating rates have been carried out. Mass changes of the samples were measured gravimetrically. Some of the iron and iron-chromium alloy samples were given a pretreatment with a solution that resulted in improved scale adherence. Fraction of reaction against temperature plots have been analysed in terms of available non-isothermal kinetic equations utilizing both the differential and integral forms and activation energies have been evaluated. Isothermal rate constant values evaluated from non-isothermal kinetic equations match fairly well with those obtained isothermally, especially for the iron system. The activation energy and the rate constants have been found to change with heating rates, indicating the influence of initial oxide grain structure and morphology on the kinetics of scale growth.
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