Inconel thermal-convection loop

Fig. 13-3. Hot-leg section from an Inconel thermal-convection loop which circulated the fuel mi.xture NaF-ZrF4-UF4 (50-46-4 mole %) for 1000 hr at 1500°F. (250 X)...

Figure 3. Hot leg and cold leg sections from Inconel-sodium thermal convection loop...

The time-dependence of void formation in Inconel, as observed both in thermal-convection and forced-circulation systems, indicates that the attack is initially quite rapid but that, it then decreases until a straight-line relationship exists between depth of void formation and time. This effect can 1)0 explained in terms of the corrosion reactions discussed above. The initial rapid attack found for both types of loops stems from the reaction of cliromium with impurities in the molt [reactions (13-1) and (13-2)] and with the FF4 constituent of the salt [reaction (13-3)] to establish a quasi-etiuilibrium amount of CrF2 in the salt. At this point attack proceeds linearly with time and occurs by a mass-transfer mechanism which, although it arises from a different cause, is similar to the phenomenon of temperature-gradient mass transfer observed in liquid metal corrosion. 

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See also in sourсe #XX -- [ , ]

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