Sulfation of CeO/sub 2/ and ZrO/sub 2/ relating to hot corrosion

Journal Article · Sat Jun 01 04:00:00 EDT 1985 · J. Electrochem. Soc.; (United States)

DOI:https://doi.org/10.1149/1.2114152· OSTI ID:5189138

Jones, R L; Jones, S R; Williams, C E

The reactions of SO/sub 2/-SO/sub 3/ (SO/sub 2/ + 1/2 O/sub 2/in equilibriumSO/sub 3/) with ceria (CeO/sub 2/) are of interest in the development of materials for resisting hot corrosion in gas turbine engines. Addition of CeO/sub 2/ as a dispersed oxide phase in the metal reduces sulfidation-oxidation attack on nickel-based turbine blade super alloys presumably by reducing the sulfur activity through formation of Ce/sub 2/O/sub 2/S. Ceria appears also to promote hot corrosion resistance in ZrO/sub 2/based ceramics. In material tests for MHD channels, CeO/sub 2/-ZrO/sub 2/ has shown good resistance to 1200/sup 0/C K/sub 2/SO/sub 4/K/sub 2/CO/sub 2/ melts. And, of more immediate relevance to hot corrosion in gas turbines, plasma-sprayed CeO/sub 2/-ZrO/sub 2/ has been patented as protecting super alloys against attack by vanadium and SO/chi/ impurities in turbine gas. In the experiments reported here, the authors have applied the techniques of Y/sub 2/O/sub 3/-HfO/sub 2/ investigation to study the sulfation behavior of CeO/sub 2/ and ZrO/sub 2/. Their goals were to determine if CeO/sub 2/ is more resistant to SO/sub 3/-Na/sub 2/SO/sub 4/ reaction than Y/sub 2/O/sub 3/, and if ZrO/sub 2/, like HfO/sub 2/, is strongly resistant to sulfation (Hf and Zr commonly show similar chemical behavior). The first finding could help to confirm whether CeO/sub 2/- or Y/sub 2/O/sub 3/-stabilized zirconia should be best against molten sulfate hot corrosion, while the second would aid in defining the corrosion resistance of zirconia itself.

• Research Organization: Naval Research Laboratory, Chemistry Division, Washington, DC
• OSTI ID: 5189138
• Journal Information: J. Electrochem. Soc.; (United States), Journal Name: J. Electrochem. Soc.; (United States) Vol. 132:6; ISSN JESOA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360205* -- Ceramics
Cermets
& Refractories-- Corrosion & Erosion
CERAMICS
CERIUM COMPOUNDS
CERIUM OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
COATINGS
CORROSION
CORROSION INHIBITORS
CORROSION PROTECTION
CORROSION RESISTANCE
ENGINES
GAS TURBINE ENGINES
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
MATERIALS TESTING
MHD CHANNELS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PROTECTIVE COATINGS
RARE EARTH COMPOUNDS
SULFIDATION
TEMPERATURE EFFECTS
TESTING
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES