It is well understood that selective dissolution of chromium is the primary mechanism by which structural alloys degrade in molten salt. These processes are dependent on the solubility of alloy components in molten salt, and on the presence of impurities. Low chromium nickel-base alloys such as Alloy-N have shown good compatibility in molten fluoride salts, but systematic data on alloy corrosion is lacking, especially in chloride salts.<br/>For this work, capsule-based corrosion experiments were conducted in which a series of Ni-base alloys with Cr contents ranging from 7% to 24% were exposed to molten KCl-MgCl<sub>2</sub> at 700°C for over 2000 hours. Samples were weighed to determine mass change, mounted metallographically, and characterized with optical microscopy and SEM to characterize the exposed surfaces. SEM-EDS was used to measure the extent of Cr depletion near sample surfaces. The salts in which the samples were exposed were characterized with ICP-OES to understand the effect of salt Cr content on the corrosion rate of the binary alloys.<br/>

Corrosion of Ni-Cr alloys in molten chloride salts

256th National Meeting (2018)

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