Inhibiting pitting corrosion in carbon steel exposed to dilute radioactive waste slurries

Conference · Mon Dec 30 23:00:00 EST 1991

OSTI ID:10152056

Zapp, P E; Hobbs, D T

Dilute caustic high-level radioactive waste slurries can induce pitting corrosion in carbon steel. Cyclic potentiodynamic polarization tests were conducted in simulated and actual waste solutions to determine minimum concentrations of sodium nitrate which inhibit pitting in ASTM A537 class 1 steel exposed to these solutions. Susceptibility to pitting was assessed through microscopic inspection of specimens and inspection of polarization scans. Long-term coupon immersion tests were conducted to verify the nitrite concentrations established by the cyclic potentiodynamic polarization tests. The minimum effective nitrite concentration is expressed as a function of the waste nitrate concentration and temperature.

• Research Organization: Westinghouse Savannah River Co., Aiken, SC (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC09-89SR18035
• OSTI ID: 10152056
• Report Number(s): WSRC-MS--91-519; CONF-920458--9; ON: DE92015334
• Country of Publication: United States
• Language: English

Related Subjects

052002
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
36 MATERIALS SCIENCE
360105
CORROSION AND EROSION
CORROSIVE EFFECTS
HIGH-LEVEL RADIOACTIVE WASTES
HYDROXIDES
NITRITES
PH VALUE
PITTING CORROSION
SAVANNAH RIVER PLANT
SLURRIES
STEEL-ASTM-A537
TANKS
WASTE DISPOSAL AND STORAGE