Material compatibility analysis

Gabriela Bran-Anleu Richard Wirz

The goals of the Material Compatibility Analysis task are to: (1) test the compatibility of primary tank materials with elemental sulfur; and (2) identify potential linings (if necessary) for tank materials. Three different alloys with potential application for containment of sulfur as an energy storage fluid, namely Stainless Steel 304, Stainless Steel 316, and Inconel 600, were studied. All alloys were thermally cycled to maximum temperatures of 500 °C and 600 °C, and kept at that temperatures for a prolonged period of time. Wall thickness measurements, SEM and EDS results for all the three different alloys were performed before and after sulfur exposure. Overall for the typical range of impurities in commercially available elemental sulfur, corrosion rates for high temperature solar thermal energy applications remained acceptable for SS 316 and Inconel 600 alloys.