Microstructure and kinetics of hot corrosion for a nickel alloy in molten salt

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Metallography, analytical SEM, and XRD were used to measure kinetics and characterize the microstructure of hot corrosion of the Ni-Cr-Fe alloy INCONEL 600 after 500 h immersion in molten Na{sub 2}CO{sub 3}- NaCl salt at 900-950 C in an oxidizing atmosphere. This was done to assess the alloy as a reaction vessel material for a waste treatment process known as Molten Salt Oxidation. The alloy was found to hot corrode by surface oxidation and intergranular attack. Combined rate for loss of load-bearing cross-section metal was comparable to corrosion rates for analogous salts. About 5% of the oxide scale was a ... continued below

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12 p.

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Stevens, D.W.; Brummond, W.A.; Grimmett, D.L.; Newcomb, J.C.; Chiang, K.T. & Gay, R.L. December 1, 1996.

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Description

Metallography, analytical SEM, and XRD were used to measure kinetics and characterize the microstructure of hot corrosion of the Ni-Cr-Fe alloy INCONEL 600 after 500 h immersion in molten Na{sub 2}CO{sub 3}- NaCl salt at 900-950 C in an oxidizing atmosphere. This was done to assess the alloy as a reaction vessel material for a waste treatment process known as Molten Salt Oxidation. The alloy was found to hot corrode by surface oxidation and intergranular attack. Combined rate for loss of load-bearing cross-section metal was comparable to corrosion rates for analogous salts. About 5% of the oxide scale was a continuous, dense, protective layer of Cr{sub 2}O{sub 3} at the metal/oxide interface. A middle portion comprised about 55% of the scale and was a porous, mixed oxide of NiO>Cr{sub 2}O{sub 3}>Fe{sub 2}O{sub 3}. The outer 40% was nearly all NiO with dense grains and cavitated grain boundaries. Overall, the NiO was dominant and the lesser amounts of Cr{sub 2}O{sub 3} and Fe{sub 2}O{sub 3} were roughly equivalent. No direct invasion of salt through the oxide to the metal was observed.

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12 p.

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OSTI as DE97051679

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  • IMS/ASM symposium conference, Pittsburg, PA (United States), 21-24 Jul 1996

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  • Other: DE97051679
  • Report No.: UCRL-JC--126053
  • Report No.: CONF-9607183--2
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 462876
  • Archival Resource Key: ark:/67531/metadc687261

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • December 1, 1996

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  • July 25, 2015, 2:21 a.m.

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  • Feb. 17, 2016, 2:27 p.m.

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Stevens, D.W.; Brummond, W.A.; Grimmett, D.L.; Newcomb, J.C.; Chiang, K.T. & Gay, R.L. Microstructure and kinetics of hot corrosion for a nickel alloy in molten salt, article, December 1, 1996; California. (digital.library.unt.edu/ark:/67531/metadc687261/: accessed December 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.