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Electronic Resource
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SAND Report: SAND82-8210, February 1982.
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Library's review
ABSTRACT:
The corrosion behavior of Type 316 stainless steel and Incoloy 800 in molten NaN03-KN03 was studied using thermal convection loops which operated between the temperature limits, 630°C-350°C, for up to 4000 hours. Corrosion rates were approximately 1 mil/year (2.5 x 10-2 mm/year) at
The corrosion behavior of Type 316 stainless steel and Incoloy 800 in molten NaN03-KN03 was studied using thermal convection loops which operated between the temperature limits, 630°C-350°C, for up to 4000 hours. Corrosion rates were approximately 1 mil/year (2.5 x 10-2 mm/year) at
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600°C for 316SS but increased to about 4 mil/year at 630°C. Less extensive results are reported for IN800 but the corrosion rates appear to be similar to 316SS. Corrosion products consisted of the spinels, Fe304 and Fe(Fe,Cr)204, at temperatures below 600°C~ although NaFe02 and Fe(Fe,Cr)204 were present at higher temperatures. In addition, internal oxide penetration was observed in INSOO. Considerable spalling of surface scales was found at temperatures above 600°C and a mass balance was developed to estimate total corrosion rates from weight change and metallographic data. Chromium, but not iron or nickel, accumulated as a solute in the melt as a result of depletion from the alloys, but no thermal gradient mass transfer was detected. Show Less