Corrosion and Arc Erosion in MHD Channels (Quarterly Progress Report for Period April - June 1990)

Technical Report · Mon Jul 30 04:00:00 EDT 1990

DOI:https://doi.org/10.2172/6020326· OSTI ID:6020326

Rosa, Richard J. ^[1]; Pollina, Richard J. ^[2]

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1. Montana State Univ., Bozeman, MT (United States)
2. Montana State Univ., Bozeman, MT (United States); Avco-Everett Research Laboratory, Everett, MA (United States)

The objective of this task is to study the corrosion and arc erosion of MHD materials in a cooperative effort with, and to support, the MHD topping cycle program. Materials tested in the Avco Research Laboratory/Textron facility, or materials which have significant MHD importance, will be analyzed to document their physical deterioration. Conclusions shall be drawn about their wear mechanisms and lifetime in the MHD environment with respect to the following issues; sulfur corrosion, electrochemical corrosion, and arc erosion. The impact of any materials or slag conditions on the level of power output and on the level of leakage current in the MHD channel will also be noted, where appropriate. The work performed to date in the analysis of channel gas side materials has served to identify and clarify the respective environments to which the various materials are subjected and identified a performance ranking of materials. For high voltage intercathode gaps, which show the most severe wear, the materials rank in the order from best to worst: W, Mo, 90WCu, 97W2Fe1Ni, 75WCu, and Cr. We have shown data which indicates that lifetime is sensitive to gap voltage. Therefore for conditions under which iron oxide addition maintains low voltage intercathode gaps 75WCu becomes an excellent cathode material.

• Research Organization: Montana State Univ., Bozeman, MT (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: FG22-88PC88928
• OSTI ID: 6020326
• Report Number(s): DOE/PC/88928--T2; ON: DE91008527
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
300103* -- MHD Generators-- Materials
Components
& Auxiliaries
36 MATERIALS SCIENCE
ALLOYS
CATHODES
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMIUM
COAL-FIRED MHD GENERATORS
COPPER ALLOYS
CORROSION
CORROSIVE EFFECTS
CURRENTS
DIRECT ENERGY CONVERTERS
DOCUMENT TYPES
ELECTRIC CURRENTS
ELECTROCHEMICAL CORROSION
ELECTRODES
ELEMENTS
EROSION
IRON ALLOYS
IRON COMPOUNDS
IRON OXIDES
LEAKAGE CURRENT
MATERIALS
MATERIALS TESTING
METALS
MHD CHANNELS
MHD GENERATOR CDIF
MHD GENERATORS
MOLYBDENUM
NICKEL ALLOYS
NONMETALS
OPTIMIZATION
OXIDATION
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PERFORMANCE
PROGRESS REPORT
SERVICE LIFE
SLAGS
SULFUR
TEST FACILITIES
TESTING
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
TUNGSTEN
TUNGSTEN ALLOYS
WEAR