CORROSION OF NICKEL-BASE SPECIMENS EXPOSED IN THE VOLATILITY PILOT PLANT MARK III FLUORINATOR

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The combination of operating temperatures around 550 deg C with LiF present in the salt baths produces about the same bulk metal losses on Ni and Ni- base alloys as was found by operating at 650 deg C without Li in the salt baths. The presence of U accelerates corrosion of Ni and Ni-base alloys during the Volatility Process fluorination cycle. Prior F conditioning of L Ni decreases corrosion of the material during subsequent fluorination. Prior F conditioning of INCO-61 weld metal increases the attack on INCO 61 during subsequent fluorination. Bulk metal losses on L Ni and the Ni-binary ... continued below

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Pages: 50

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Kegley, T. M., Jr. & Litman, A. P. November 13, 1962.

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Description

The combination of operating temperatures around 550 deg C with LiF present in the salt baths produces about the same bulk metal losses on Ni and Ni- base alloys as was found by operating at 650 deg C without Li in the salt baths. The presence of U accelerates corrosion of Ni and Ni-base alloys during the Volatility Process fluorination cycle. Prior F conditioning of L Ni decreases corrosion of the material during subsequent fluorination. Prior F conditioning of INCO-61 weld metal increases the attack on INCO 61 during subsequent fluorination. Bulk metal losses on L Ni and the Ni-binary alloys containing Al, Co, Fe, or Mn are about the same during fluorination at 550 deg C with Li present in the fluoride salt baths. The presence of the alloying elements, Al, Fe, or Mn, in Ni drastically reduces or lelements intergranular attack usually found in unalloyed Ni exposed to a fluorination environment. In fluorination environments, the effect of adding Co to Ni on subsequent corrosion by intergranular attack of the binary is unclear. These reported tests showed that serious intergranular attack of a 95% Ni --5% Co specimen occurred. On the other hand, this test series and previous series showed good resistance to this form of corrosion by Ni containing 10 and 20 wt% Co. resistance to bulk metal losses, intergranular attack, and grain-boundary modifications when exposed to fluorination environments than L Ni and all Ni alloys tested. (auth)

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Pages: 50

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  • Other Information: Orig. Receipt Date: 31-DEC-63

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  • Report No.: ORNL-TM-411
  • Grant Number: W-7405-ENG-26
  • DOI: 10.2172/4747940 | External Link
  • Office of Scientific & Technical Information Report Number: 4747940
  • Archival Resource Key: ark:/67531/metadc1026518

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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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Creation Date

  • November 13, 1962

Added to The UNT Digital Library

  • Oct. 18, 2017, 7:39 a.m.

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  • Oct. 23, 2017, 12:25 p.m.

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Kegley, T. M., Jr. & Litman, A. P. CORROSION OF NICKEL-BASE SPECIMENS EXPOSED IN THE VOLATILITY PILOT PLANT MARK III FLUORINATOR, report, November 13, 1962; Oak Ridge, Tennessee. (digital.library.unt.edu/ark:/67531/metadc1026518/: accessed June 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.