Skip to main content
OSTI.GOVU.S. Department of Energy Office of Scientific and Technical Information
U.S. Department of Energy
Office of Scientific and Technical Information
 

Oxidation and chromium depletion of Alloy 800 and 316SS by molten NaNO/sub 3/-KNO/sub 3/ at temperatures above 600/degree/C

Technical Report ·
DOI:https://doi.org/10.2172/5103265· OSTI ID:5103265
The corrosion behavior of Alloy 800 and Type 316 stainless steel in molten NaNO/sub 3/-KNO/sub 3/ was studied at temperatures from 605/degree/C to 630/degree/C. Corrosion behavior was significantly different from that previously reported in nitrate melts at temperatures up to 600/degree/C and involved a combination of oxidation, internal nitridation and sodium metallate formation. Corrosion kinetics, determined metallographically, switched from a parabolic to a linear rate equation as temperature increased. Corrosion was uniform and resulted in metal losses on the order of 100 micronsyear at 630/degree/C. Among the alloying elements, chromium was depleted from the alloy as the result of a basic fluxing process. The kinetic equations describing chromium depletion also changed from parabolic to linear with increasing temperature. The effect of the equilibrium chemistry of the melt on the corrosion behavior of the alloys is analyzed and possible corrosion mechanisms are discussed. 24 refs., 8 figs., 2 tabs.
Research Organization:
Sandia National Labs., Livermore, CA (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC04-76DR00789
OSTI ID:
5103265
Report Number(s):
SAND--86-9009; ON: DE88010499
Country of Publication:
United States
Language:
English

Similar Records

Corrosion of 316SS and IN800 in molten NaNO/sub 3/ - KNO/sub 3/
Conference · Thu Oct 01 00:00:00 EDT 1981 · Proc. - Electrochem. Soc.; (United States) · OSTI ID:6899554
Corrosion of 304SS by molten NaNO/sub 3/-KNO/sub 3/ in a thermal convection loop
Technical Report · Sun Nov 30 23:00:00 EST 1980 · OSTI ID:6624736
Thermal-convection-loop corrosion tests of 316SS and IN800 in molten nitrate salts
Technical Report · Sun Jan 31 23:00:00 EST 1982 · OSTI ID:5353081

Related Subjects

14 SOLAR ENERGY
140702 -- Solar Thermal Power Systems-- Central Receiver
36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
ALKALI METAL COMPOUNDS
ALLOYS
CHEMICAL REACTIONS
CHROMIUM
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION
CORROSION RESISTANT ALLOYS
CSP
Concentrating Solar Power
ELEMENTS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HIGH TEMPERATURE
INCOLOY 800
INCOLOY ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
KINETICS
MASS TRANSFER
MATERIALS
METALS
MOLTEN SALTS
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NITRATES
NITROGEN COMPOUNDS
OXIDATION
OXYGEN COMPOUNDS
POTASSIUM COMPOUNDS
POTASSIUM NITRATES
SALTS
SCALING
SODIUM COMPOUNDS
SODIUM NITRATES
STAINLESS STEEL-316
STAINLESS STEELS
STEELS
TRANSITION ELEMENTS