Abstract
The structure and composition of oxide films may give an insight into the corrosion resistance of nickel alloys of the type used as tubing in nuclear steam generators. This paper describes the results of a preliminary analytical TEM study aimed at characterizing the surface films formed on Inconel 600 and Incoloy 800 during exposure to high temperature water (300°C).Alloy coupons were exposed to water at pH 10. pH control was accomplished by additions of either sodium hydroxide or morpholine. Thin foils and extraction replicas were prepared to study the oxide films. Thin electron transparent sections through the oxide/metal interface region were produced using standard techniques. Quantification of the Energy Dispersive and Electron Energy Loss Spectroscopies (EDS and EELS) spectra was carried out using calibration kAB factors and calculated partial cross sections respectively. Identification of crystalline phases was achieved by Focused Beam Electron Diffraction (FBED).
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