Thermal-convection-loop corrosion tests of 316SS and IN800 in molten nitrate salts
The corrosion behavior of Type 316 stainless steel and Incoloy 800 in molten NaNO/sub 3/-KNO/sub 3/ was studied using thermal convection loops which operated between the temperature limits, 630/sup 0/C to 350/sup 0/C, for up to 4000 hours. Corrosion rates were approximately 1 mil/year (2.5 x 10/sup -2/ mm/year) at 600/sup 0/C for 316SS but increased to about 4 mil/year at 630/sup 0/C. Less extensive results are reported for IN800 but the corrosion rates appear to be similar to 316SS. Corrosion products consisted of the spinels, Fe/sub 3/O/sub 4/ and Fe(Fe,Cr)/sub 2/O/sub 4/, at temperatures below 600/sup 0/C, although NaFeO/sub 2/ and Fe(Fe,Cr)/sub 2/0/sub 4/ were present at higher temperatures. In addition, internal oxide penetration was observed in IN800. Considerable spalling of surface scales was found at temperaturs above 600/sup 0/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.
- Research Organization:
- Sandia National Lab. (SNL-CA), Livermore, CA (United States)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 5353081
- Report Number(s):
- SAND82-8210; ON: DE82012313
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
INCOLOY 800
CORROSION
MOLTEN SALTS
CORROSIVE EFFECTS
POTASSIUM NITRATES
SODIUM NITRATES
STAINLESS STEEL-316
CARBONATES
CHEMICAL COMPOSITION
CHROMIUM
EXPERIMENTAL DATA
HIGH TEMPERATURE
HOURLY VARIATIONS
IRON OXIDES
MICROSTRUCTURE
NITRITES
OXIDATION
SCALING
SODIUM OXIDES
SPINELS
TEMPERATURE DEPENDENCE
WEIGHT
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBON COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION RESISTANT ALLOYS
CRYSTAL STRUCTURE
DATA
ELEMENTS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
INCOLOY ALLOYS
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
IRON COMPOUNDS
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MATERIALS
METALS
MINERALS
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NITRATES
NITROGEN COMPOUNDS
NUMERICAL DATA
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
POTASSIUM COMPOUNDS
SALTS
SODIUM COMPOUNDS
STAINLESS STEELS
STEELS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
VARIATIONS
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Concentrating Solar Power
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360105 - Metals & Alloys- Corrosion & Erosion