By Hans Jurgen Grabke, Michael Schutze
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Extra resources for Corrosion by Carbon and Nitrogen: Metal Dusting, Carburisation and Nitridation (EFC 41)
The bright field (BF) TEM image in Fig. 5a is a cross-section of the same sample of 11/4Cr–1/2Mo steel (Fig. 3) showing a surface layer of M3C and carbon deposit on M3C. 5 (a) Cross-sectional BF TEM image showing M3C/carbon interface of 11/4Cr–1/2Mo steel subjected to metal dusting at 700 ∞F (371 ∞C) for 48 h in 50CO: 50H2. (b) SAED pattern from the M3C/carbon interface. (c) High-resolution TEM image showing graphite fringes. and undergo further disintegration with continued carbon transfer. A selected area electron diffraction (SAED) pattern, taken in the M3C/carbon interfacial area at a beam orientation of B =  Fe3C, Fig.
2 Temperature dependence of the metal dusting corrosion rate of 11/4Cr–1/2Mo and 5Cr–1/2Mo steels in 50CO: 50H2. mixture is shown in Fig. 2. Also plotted is the general corrosion rate of pure Fe measured under the same conditions for comparison. A detailed discussion of the temperature dependence of the metal dusting of Fe has been published previously . Similar to the behavior of Fe, the effect of temperature on the metal dusting rate can be divided into three regimes – these regimes are marked in Fig.
Ni content of the alloys. 16 Corrosion by carbon and nitrogen Metal wastage rate (mg/cm2 h) Metal wastage rate (mg/cm2 h) diffusion inward and Cr diffusion outward, to start either metal dusting or protective scale formation. Cr diffusion is relatively fast and increases with the Ni content of the alloys. However, the widely used Alloy 600 with only 15–16% Cr is not resistant, and many failure cases have been reported. On Alloy 600 sometimes general attack was observed, but mostly relatively flat pits spread gradually over the surface.
Corrosion by Carbon and Nitrogen: Metal Dusting, Carburisation and Nitridation (EFC 41) by Hans Jurgen Grabke, Michael Schutze