Electrochemical corrosion of iron-magnesium-aluminum spinel in molten potassium salts and coal slag
Iron-magnesium-aluminum spinel (nominally 0.25 Fe/sub 2/O/sub 3/-0.75 MgAl/sub 2/O/sub 3/) (FMAS) was tested both chemically (control) and electrochemically (anode and cathode) to determine if it could withstand conditions associated with magnetohydrodynamic (MHD) generators. The spinel was corrosion tested in two molten potassium salts (K/sub 2/CO/sub 3/ and K/sub 2/SO/sub 4/) and two coal slags. Corrosion rates were greater in the cathode and anode tests than in the control test. Post-test microstructures were examined with optical and scanning electron microscopes. Chemical composition was determined by semiquantitative analyses of some of the microstructural features using the energy dispersive X-ray technique. Chemical compositions of the post-test phases were generally different in the cathode than in the anode or the control.
- Research Organization:
- Battelle, Pacific Northwest Labs., Richland, WA
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 6047624
- Journal Information:
- Am. Ceram. Soc. Bull.; (United States), Journal Name: Am. Ceram. Soc. Bull.; (United States) Vol. 63:4; ISSN ACSBA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
300103* -- MHD Generators-- Materials
Components
& Auxiliaries
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
ANODES
CARBON COMPOUNDS
CARBONATES
CATHODES
CHALCOGENIDES
CHEMICAL REACTIONS
CORROSION
CORROSIVE EFFECTS
DIRECT ENERGY CONVERTERS
ELECTROCHEMICAL CORROSION
ELECTRODES
IRON COMPOUNDS
IRON OXIDES
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MATERIALS
MHD GENERATORS
OXIDES
OXYGEN COMPOUNDS
POTASSIUM CARBONATES
POTASSIUM COMPOUNDS
POTASSIUM SULFATES
SLAGS
SULFATES
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS