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By Appel K.I., Ratcliffe J.G., Schupp P.E. (eds.)

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In this case however, the internal corrosion typified by voiding (not readily visible in Fig. 2c) extends deeper into the alloy (~120 μm). The corrosion morphology for the Inconel 617 alloy is shown in Fig. 2d. The bright contrast on the outside of the scale was shown by EDX to be cobalt oxide which forms above a thin (10 μm) chromia scale. Beneath the scale, significant Cr Corrosion of alloys and their diffusion aluminide coatings 25 depletion effects were determined using EDX and these give rise to the very bright contrast.

Teneva-Kosseva, K. Lucka and H. Köhne, Heizungsjournal, 3 (2006), 42. 2. P. Kofstad, High Temperature Corrosion. Elsevier Applied Science, London, New York, 1988. 3. R. Bürgel, Handbuch Hochtemperaturwerkstofftechnik. Vieweg Verlag, Braunschweig, Wiesbaden, 2001. 4. Krupp VDM, Hochtemperaturwerkstoffe der Krupp VDM für den Anlagenbau, VDM Report Nr. 25, 1999. 5. H. Pfeifer and H. Thomas, Zunderfeste Legierungen. Springer Verlag, Berlin, Göttingen, Heidelberg, 1963. 46 Protective systems for High Temperature Applications 6.

At some locations, aluminium oxide was observed as a layer directly underneath the chromia scale. After 500 h at 1000 °C, a very thin aluminium oxide layer was detected at the alloy surface (Fig. 7b). Internal oxidation of chromium and aluminium occurred as well as formation of aluminium nitrides below the zone of internal oxidation. 8a shows the inner corrosion products in the bulk of Alloy 693 after 1000 h at 1000 °C. The formation of aluminium nitrides was also observed for Alloy 601 after 1000 h at 1000 °C (Fig.

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