Metal dusting of pure metals

2 Metal dusting rate of Fe as a function of H2 content in CO determined after 7 hours of corrosion at 550°C. 

Detailed cross-sectional transmission electron microscopy of the Fe3C/ carbon deposit interface corresponding to regime II and regime III reveals that graphitic carbon with its (0001) planes perpendicular to the iron carbide surface is present in many regions of the interface (Fig. 5.3). A mechanism 

4 Corrosion rate of Fe in 50CO 50H2 after 48 hours of exposure as a function of temperature (adapted from ref. 11). 

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The metal dusting of pure metals, especially Fe, was studied extensively by Hochman2. The Hochman mechanism for the metal dusting of iron involves three steps. The first step is the formation of metastable iron carbide, FejC, on the surface of iron. This reaction requires carbon activities higher than unity. 

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