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08461 Environmental and Compositional Effects on the Hot-Corrosion Behavior of Ni-Based Alloys and Coatings

Picture for 08461 Environmental and Compositional Effects on the Hot-Corrosion Behavior of Ni-Based Alloys and C
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Product Number: 51300-08461-SG
ISBN: 08461 2008 CP
Author: Vinay Deodeshmukh and Brian Gleeson
Publication Date: 2008
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Environmental and compositional factors often influence the hot-corrosion behavior of alloys and coatings used in gas turbine engine applications. This paper examines the effects of environmental factors such as salt deposition rate, gas composition, and extent of oxidation on the hot-corrosion resistance (Type I-900oC and Type II-704oC) of Ni-based alloys and coatings. It also evaluates the effects of Pt-modified ß-NiAl alloy composition on hot-corrosion resistance. Both types of hot corrosion conditions were simulated by depositing Na2SO4 salt on the test samples and then exposing those samples to a catalyzed O2:SO2 atmosphere. It was found that Type I hot corrosion resistance decreased with increase in salt deposition rate up to 8 mg/cm2; however, no measurable hot corrosion was observed when the sample was completely buried in a salt. It was also found that the Type II hot corrosion resistance of Pt-modified Ni-based alloys is very sensitive to both alloy and gas composition.
Environmental and compositional factors often influence the hot-corrosion behavior of alloys and coatings used in gas turbine engine applications. This paper examines the effects of environmental factors such as salt deposition rate, gas composition, and extent of oxidation on the hot-corrosion resistance (Type I-900oC and Type II-704oC) of Ni-based alloys and coatings. It also evaluates the effects of Pt-modified ß-NiAl alloy composition on hot-corrosion resistance. Both types of hot corrosion conditions were simulated by depositing Na2SO4 salt on the test samples and then exposing those samples to a catalyzed O2:SO2 atmosphere. It was found that Type I hot corrosion resistance decreased with increase in salt deposition rate up to 8 mg/cm2; however, no measurable hot corrosion was observed when the sample was completely buried in a salt. It was also found that the Type II hot corrosion resistance of Pt-modified Ni-based alloys is very sensitive to both alloy and gas composition.
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