Abstract
The corrosion degradation of three Inconel 617 Alloy Thermal Energy Storage capsules filled with eutectic fluoride salts LiF-MgF2-KF, LiF-MgF2-NaF and LiF-MgF2 were analyzed. The ultrahigh purity fluoride salts were previously sealed inside the Inconel capsules under controlled processing conditions and thermally cycled in vacuum over a temperature differential of 200 K near 1000 K for 10,000 hr. It was determined that the microstructural degradation is minimal but some aluminum from the alloy may have been displaced into the salt. Comparisons are made with previously reported equilibrium calculations and a semiquantitative diffusion model is presented to support the possibility of diffusion control over the corrosion. The results indicate that Inconel 617 may be a suitable material for fluoride salts in thermal energy storage applications.
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