Significance of Experimental Procedures on the Hot Corrosion Behavior of Nickel-Base Alloys Under Cyclic Conditions

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A simplified test procedure was established to assess the hot corrosion behavior of MCrAlY-type nickel-base alloys under the influence of molten sodium sulfate as well as sodium sulfate/potassium sulfate salt mixtures. Salt coated specimens were exposed to lh thermal cycles at 950°C in flowing oxygen for up to 500 cycles. Mass change data of the specimens revealed a significant dependence of the corrosion attack not only, as expected, on the average contaminant flux rate, but also on the initial amount of salt deposited during each recoating cycle. Furthermore, deposit removal before salt recoating was found to markedly influence the corrosion ... continued below

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21 pages

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Leyens, C.; Pint, B.A.; Tortorelli, P.F. & Wright, I.G. February 25, 1999.

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A simplified test procedure was established to assess the hot corrosion behavior of MCrAlY-type nickel-base alloys under the influence of molten sodium sulfate as well as sodium sulfate/potassium sulfate salt mixtures. Salt coated specimens were exposed to lh thermal cycles at 950°C in flowing oxygen for up to 500 cycles. Mass change data of the specimens revealed a significant dependence of the corrosion attack not only, as expected, on the average contaminant flux rate, but also on the initial amount of salt deposited during each recoating cycle. Furthermore, deposit removal before salt recoating was found to markedly influence the corrosion attack of the alloys. This was related to changes in salt chemistry by the dissolution of elements such as Cr from the alloy which shifted the basicity of the salt and thus affected the extent of attack. Substituting Na for K in sodium sulfate/potassium sulfate salt mixtures enerally resulted in a decreased attack. Although the high K-containing salts still caused significant attack typical of Type-I hot corrosion, the overall degration was much less than for sodium sulfate alone.

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21 pages

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  • EFC Workshop on Cyclic Oxidation, Frankfurt, Germany, February 25-26, 1999

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  • Other: DE00009231
  • Report No.: ORNL/CP-103227
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 9231
  • Archival Resource Key: ark:/67531/metadc793551

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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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  • February 25, 1999

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  • Dec. 19, 2015, 7:14 p.m.

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  • Jan. 6, 2017, 4:02 p.m.

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Leyens, C.; Pint, B.A.; Tortorelli, P.F. & Wright, I.G. Significance of Experimental Procedures on the Hot Corrosion Behavior of Nickel-Base Alloys Under Cyclic Conditions, article, February 25, 1999; (digital.library.unt.edu/ark:/67531/metadc793551/: accessed September 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.