Studies on the hot corrosion of a nickel-base superalloy, Udimet 700
The hot corrosion of nickel-base superalloy, Udimet 700, has been studied in the temperature range 900-950/sup 0/C. The effect of the amount of Na/sub 2/SO/sub 4/ on the corrosion kinetics was determined. Large weight gains and severe corrosion were associated with two different modes of degradation, the formation of large, interconnected sulfides beneath the external scale, and formation of a Na/sub 2/MoO/sub 4/-MoO/sub 3/ melt. The corrosion due to formation of the Na/sub 2/MoO/sub 4/-MoO/sub 3/ melt occurred for all the salt-coating thicknesses, whereas, large sulfides were formed only for the heavier coatings of Na/sub 2/SO/sub 4/. The formation of Na/sub 2/MoO/sub 4/-MoO/sub 3/ melt required an induction period and the length of the induction period was observed to be a function of the amount of Na/sub 2/SO/sub 4/ and of temperature.
- Research Organization:
- Case Western Reserve Univ., OH
- OSTI ID:
- 5349257
- Journal Information:
- Oxid. Met.; (United States), Vol. 25:3
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COMBUSTION PRODUCTS
CORROSIVE EFFECTS
SODIUM SULFATES
TURBINE BLADES
CORROSION
THERMAL DEGRADATION
UDIMET 700
CHEMICAL REACTION KINETICS
GAS TURBINES
METALLURGICAL EFFECTS
MOLYBDATES
MOLYBDENUM
MOLYBDENUM OXIDES
SULFIDATION
TEMPERATURE EFFECTS
ALKALI METAL COMPOUNDS
ALLOYS
ALUMINIUM ALLOYS
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMIUM ALLOYS
COBALT ALLOYS
ELEMENTS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
KINETICS
MACHINERY
MATERIALS
METALS
MOLYBDENUM ALLOYS
MOLYBDENUM COMPOUNDS
NICKEL ALLOYS
NICKEL BASE ALLOYS
OXIDES
OXYGEN COMPOUNDS
REACTION KINETICS
REFRACTORY METAL COMPOUNDS
SODIUM COMPOUNDS
SULFATES
SULFUR COMPOUNDS
TITANIUM ALLOYS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
TURBINES
TURBOMACHINERY
UDIMET ALLOYS
360105* - Metals & Alloys- Corrosion & Erosion