Corrosion of stainless and carbon steels in molten mixtures of industrial nitrates

Technical Report · Tue Mar 01 04:00:00 EST 1994

DOI:https://doi.org/10.2172/10141843· OSTI ID:10141843

Goods, S H; Bradshaw, R W ^[1]; Prairie, M R; Chavez, J M ^[2]

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1. Sandia National Labs., Livermore, CA (United States)
2. Sandia National Labs., Albuquerque, NM (United States)

Corrosion behavior of two stainless steels and carbon steel in mixtures of NaNO{sub 3} and KNO{sub 3} was evaluated to determine if impurities found in commodity grades of alkali nitrates aggravate corrosivity as applicable to an advanced solar thermal energy system. Corrosion tests were conducted for 7000 hours with Types 304 and 316 stainless steels at 570C and A36 carbon steel at 316C in seven mixtures of NaNO{sub 3} and KNO{sub 3} containing variations in impurity concentrations. Corrosion tests were also conducted in a ternary mixture of NaNO{sub 3}, KNO{sub 3}, and Ca(NO{sub 3}){sub 2}. Corrosion rates were determined by descaled weight losses while oxidation products were examined by scanning electron microscopy, electron microprobe analysis, and X-ray diffraction. The nitrate mixtures were periodically analyzed for changes in impurity concentrations and for soluble corrosion products.

• Research Organization: Sandia National Labs., Livermore, CA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC04-94AL85000
• OSTI ID: 10141843
• Report Number(s): SAND--94-8211; ON: DE94009866; BR: GB0103012
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
140702
36 MATERIALS SCIENCE
360105
CARBON STEELS
CENTRAL RECEIVER
CENTRAL RECEIVERS
CORROSION
CORROSION AND EROSION
CORROSIVE EFFECTS
CSP
Concentrating Solar Power
DEMONSTRATION PLANTS
IMPURITIES
MOLTEN SALTS
POTASSIUM NITRATES
SODIUM NITRATES
SOLAR THERMAL POWER PLANTS
STAINLESS STEEL-304
STAINLESS STEEL-316