Gas-side corrosion performance of superheater/ITAH tube alloys in MHD tests with high sulfur coal
Corrosion data have been obtained for tubes exposed for 600, 1500, and 2000 hours in a proof-of-concept magnetohydrodynamics (MHD) power generation test facility (the CFFF) to conditions representative of superheater and intermediate temperature air heater components. The tubes, coated with K[sub 2]SO[sub 4]-rich deposits, developed predominantly oxide surface scales. Stainless steel alloy scales were not sufficiently protective to prevent internal oxidation/sulfidation of the subsurface metal. Corrosion resistance increased with chromium content. Low chromium alloys had thick scaling but no internal penetration. Although no liquid phases were present corrosion rates and scale morphologies were similar to those typical of conventional coal ash corrosion in the presence of molten alkali sulfates. Corrosion rates derived from scale thickness and penetration 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.
- Research Organization:
- Tennessee Univ., Tullahoma, TN (United States). Space Inst.
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC02-79ET10815
- OSTI ID:
- 7368529
- Report Number(s):
- DOE/ET/10815-213; CONF-930626-7; ON: DE93015746
- Resource Relation:
- Conference: 31. symposium on engineering aspects of magnetohydrodynamics, Whitefish, MT (United States), 29 Jun - 1 Jul 1993
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
MHD GENERATOR CFFF
SUPERHEATERS
CORROSION
DEPOSITS
AIR HEATERS
AUSTENITIC STEELS
CHROMIUM STEELS
CORROSION RESISTANCE
SCALING
STAINLESS STEELS
TIME DEPENDENCE
TUBES
ALLOYS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
COAL-FIRED MHD GENERATORS
DIRECT ENERGY CONVERTERS
HEATERS
HIGH ALLOY STEELS
IRON ALLOYS
IRON BASE ALLOYS
MHD GENERATORS
STEELS
300102* - MHD Generators- Performance & Testing
360105 - Metals & Alloys- Corrosion & Erosion