Results of 500-hour superheater/intermediate temperature airheater tube corrosion tests in the MHD coal fired flow facility
Corrosion data have been obtained for tubes, (austenitic steels, carbon steels, and intermediate chromium steels), exposed to conditions representative of superheater and intermediate temperature air heater components for 500 hours in a proof-of-concept magnetohydrodynamics MHD coal fired flow facility (MHD CFFF). The tubes, coated with K{sub 2}SO{sub 4}-rich deposits, developed oxide surface scales which were not protective against intergranular sulfur penetration of the subsurface metal. Corrosion rates derived from scale thickness and intergranular corrosion depth measurements are reported, along with scale morphologies and compositions. The implications of the results on commercial MHD utilization of the alloys are discussed, as well as the indicated need for more corrosion resistant alloys or coatings under the most severe exposure conditions. 4 refs., 27 figs., 6 tabs.
- Research Organization:
- Tennessee Univ., Tullahoma, TN (USA). Space Inst.
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (USA)
- DOE Contract Number:
- AC02-79ET10815
- OSTI ID:
- 5745408
- Report Number(s):
- DOE/ET/10815-144; UTSI-90-3; ON: DE91014262
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
AUSTENITIC STEELS
CORROSION
CARBON STEELS
CHROMIUM
METALLURGICAL EFFECTS
CHROMIUM ALLOYS
MHD GENERATOR CFFF
TUBES
AIR HEATERS
CORROSION RESISTANCE
GRAIN BOUNDARIES
INTERGRANULAR CORROSION
OXIDATION
POTASSIUM SULFATES
RETROFITTING
SCALING
SULFIDATION
SUPERHEATERS
TEMPERATURE EFFECTS
ALKALI METAL COMPOUNDS
ALLOYS
CHEMICAL REACTIONS
COAL-FIRED MHD GENERATORS
CRYSTAL STRUCTURE
DIRECT ENERGY CONVERTERS
ELEMENTS
HEATERS
IRON ALLOYS
IRON BASE ALLOYS
METALS
MHD GENERATORS
MICROSTRUCTURE
OXYGEN COMPOUNDS
POTASSIUM COMPOUNDS
STEELS
SULFATES
SULFUR COMPOUNDS
TRANSITION ELEMENTS
300103* - MHD Generators- Materials
Components
& Auxiliaries
360105 - Metals & Alloys- Corrosion & Erosion