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Electronic Resource
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SAND Report: SAND82-8028, September 1982.
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Library's review
ABSTRACT:
Molten drawsalt (NaN03 -KN03) 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
Molten drawsalt (NaN03 -KN03) 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
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while in contact with molten drawsalt for more than 6000 hours at 600°C. The alloys examined were 2-1/4 Cr-l Mo, 5 Cr-l/2 Mo, and 9 Cr-l 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 spalling of A1203 from the surface (the occurrence of A1203 is a result of the aluminizing process) and dissolution of corrosion products NaA102 and/or NaFe02 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 percent) relative to Incoloy 800, and provide at least equivalent corrosion resistance • Show Less