Abstract
Continuous observation of oxidation processes on the surface of austenitic stainless steels has been achieved byin situoxidation of electrochemically thinned foils in the AEI EM7 H.V.E.M. using the gas reaction cell designed by Swann (1)Figure 1 shows the sequence of oxidation of a Fe: 18% Cr: 10% Ni foil at 700°C in air at 3.5 kPa recorded with an accelerating potential of 700 kV. Initially the surface reaction is characterised by the rapid formation of a transparent layer of minute randomly oriented crystals of the cubic oxide (Fe, Cr)3O4which is revealed by the appearance of diffuse rings on the single crystal γFe diffraction pattern. After approximately 30 seconds at 700γC the interface between the cubic oxide and the base alloy can be observed progressing inwards from the thinnest edges of the foil, and the formation of nuclei of α(Fe, Cr)2O3commences within the cubic oxide layer over both sides of the foil.
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