Snehamanjaree Samal, Debashis Ghosh, and Swapan Kumar Mitra:
Effect of crystal structure on high temperature oxidation behaviour of commercial pure iron, copper and zinc
Oxidation, crystal structure, iron, copper, zinc, scale morphology
The present study investigates the high temperature oxidation behaviour of commercially pure iron, copper and zinc, having different crystal structure bcc, fcc and hcp. All three samples of pure metals are exposed to different temperatures in dry air for 10 h under PO2 = 21.27 kPa. The temperature for the investigation in this environment is 1023, 723 and 279 °C, resp. (approximately 2/3 of the melting point of iron, copper and zinc). The oxidation rate is calculated by the weight gain method and the external scales are examined in scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS). The results indicate that the oxidation rates and scale morphologies depend upon the crystal structures. The pure iron having the bcc structure is showing higher oxidation rate in comparison to copper (fcc) and zinc (hcp). The maximum scale adherence and minimum oxidation rate is observed for zinc. On the other hand, iron shows maximum oxidation rate. The external scale of iron shows minimum scale adherence, scale ballooning and separation from the substrate.
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