Abstract
The corrosion behavior of a Hastelloy N-316 L stainless steel couple in molten LiF-NaF-KF salt at 700 °C was investigated using electrochemistry, immersion tests, and microstructure analyses. Hastelloy N exhibits better corrosion resistance than 316 L SS. Galvanic coupling between two metals accelerates the corrosion of 316 L SS but impedes the corrosion of Hastelloy N. Fe dissolved from 316 L SS was alloyed with Ni in Hastelloy N to form a concentration cell of Fe, which accelerated the mass transfer of Fe from 316 L SS to Hastelloy N. The interactions of the Hastelloy N-316 L SS couple depend on galvanic corrosion and the Fe transfer.
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