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Author Misra, A. K.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ 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 ♦ Metals & Alloys- Corrosion & Erosion
Abstract 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.
Educational Use Research
Learning Resource Type Article
Publisher Date 1986-04-01
Publisher Place United States
Journal Oxid. Met.
Volume Number 25
Issue Number 3
Organization Case Western Reserve Univ., OH


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