Abstract
The behaviour of a binary Fe-Cr alloy oxidised in CO 2 at atmospheric pressure and high pressure (40 atm.) has been examined using TEM. By ion beam thinning transverse sections across the oxide and metal details of the oxide structure and composition have been characterized. At both pressures, the basic oxidation processes appear to be the same; the oxide is duplex in nature, and the metal is carburised forming Cr-rich M 7C 3 carbides which are internally oxidised in a zone below the oxide. The main effect of a higher gas pressure is to produce a deposition of carbon into the inner oxide. Mechanisms are advanced to account for the protective oxide structure.
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