Abstract
Molten drawsalt (NaNO 3-KNO3) is being considered as the energy transfer and storage medium for many solar central receiver applications. In an effort to reduce the cost of the containment material while maintaining corrosion resistance, alloys with aluminide coatings have been examined while in contact with molten drawsalt for more than 6000 hours at 600 °C. The alloys examined were 2.25 Cr-1 Mo, 5 Cr-0.5 Mo, and 9 Cr-1 Mo low-alloy steels, and 316 stainless steel. The results show a steady, albeit slow, net weight loss over the course of the experiment. The weight loss has been attributed to spoiling of Al2O3 from the surface (the occurrence of Al 2O3 is a result of the aluminizing process) and dissolution of corrosion products NaAlO2 and/or NaFeO2 during post-immersion handling. Scanning electron micrographs of exposed surfaces revealed little or no corrosion of the base metal. It has been concluded that aluminide coated alloys could provide significant cost savings (~50 pct) relative to INCOLOY Alloy 800, and provide at least equivalent corrosion resistance.
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