Abstract
Abstract Hastelloy N (Ni-16% Mo-7% Cr-5% Fe) is quite compatible with pure fluoride salts and corrosion is difficult to detect. However, when impurities are present, both metal fluoride and metal corrosion products may deposit as the result of the interaction of molten fluoride salts and alloys in a temperature gradient system. Both types of deposits have been studied as they have occurred in iron base and nickel base thermal convection loops operating in the range 460 to 605 C (860 to 1121 F). In the iron base loop, metal deposits, consisting mainly of iron, resulted from extreme changes in the equilibrium constant of the corrosion reaction due to changes in temperature and from the highly oxidizing conditions of the salt. Metal-fluoride deposits also caused plugging in both the iron base and a nickel base loop and were mainly chromium fluorides. These were precipitated from the saturated salt. Under steady state (low corrosion rate) conditions, more of the least stable fluoride corrosion products (such ...
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