Corrosion of Fe alloys in NaNO 3 -KNO 3 -NaNO 2 at 823 K

C. M. Kramer, W. H. Smyrl, W. B. Estill

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In support of advanced solar central receiver programs, six commercially available, iron-based construction materials were exposed to a molten NaNO 2 -NaNO 3 -KNO 3 salt mixture at 823 K for periods up to six months. After one month of exposure, oxide coatings formed on each alloy;the amount of oxidation ranged from 10 mg/cm 2 for low carbon steel to ∼0.7 mg/cm 2 for 310 stainless steel. The low-Cr alloys tended to blister and spall but the stainless steels were much more corrosion resistant. Analysis of the oxide surface of a 5 pct chrome alloy clearly indicated a chromium enriched layer was present at the oxide/metal interface and an iron oxide rich layer at the oxide/nitrate interface.

Original languageEnglish (US)
Pages (from-to)59-65
Number of pages7
JournalJournal of Materials for Energy Systems
Issue number4
StatePublished - Mar 1 1980


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