Corrosion of alloy 718 in a mercury thermal convection loop

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Description

Two thermal convection loops (TCLs) fabricated from annealed alloy 718 continuously circulated mercury (Hg) with 1000 wppm gallium (Ga), respectively, for about 5000 h, duplicating previous TCL tests for annealed 316L. In each case, the maximum loop temperature was 305C, the minimum temperature was 242C, and the Hg flow rate was approximately 1.2 m/min. Unlike the 316L exposed to Hg, which above about 260C exhibited a thin, porous surface layer depleted in Ni and Cr, the alloy 718 coupons revealed essentially no wetting and, therefore, no interaction with that Hg at any temperature. Alloy 718 coupons suspended in the loops ... continued below

Physical Description

23 p.

Creation Information

Pawel, S.J.; DiStefano, J.R. & Manneschmidt, E.T. December 1, 1999.

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This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 14 times . More information about this report can be viewed below.

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  • Oak Ridge National Laboratory
    Publisher Info: Oak Ridge National Lab., Oak Ridge, TN (United States)
    Place of Publication: Oak Ridge, Tennessee

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Description

Two thermal convection loops (TCLs) fabricated from annealed alloy 718 continuously circulated mercury (Hg) with 1000 wppm gallium (Ga), respectively, for about 5000 h, duplicating previous TCL tests for annealed 316L. In each case, the maximum loop temperature was 305C, the minimum temperature was 242C, and the Hg flow rate was approximately 1.2 m/min. Unlike the 316L exposed to Hg, which above about 260C exhibited a thin, porous surface layer depleted in Ni and Cr, the alloy 718 coupons revealed essentially no wetting and, therefore, no interaction with that Hg at any temperature. Alloy 718 coupons suspended in the loops revealed inconsequentially small weight changes, and both the coupons and loop tubing exhibited no detectable metallographic evidence of attack.

Physical Description

23 p.

Notes

OSTI as DE00750987

Medium: P; Size: 23 pages

Source

  • Other Information: PBD: 1 Dec 1999

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  • Report No.: ORNL/TM-1999/323
  • Grant Number: AC05-96OR22464
  • DOI: 10.2172/750987 | External Link
  • Office of Scientific & Technical Information Report Number: 750987
  • Archival Resource Key: ark:/67531/metadc707137

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Creation Date

  • December 1, 1999

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • April 10, 2017, 3:44 p.m.

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Pawel, S.J.; DiStefano, J.R. & Manneschmidt, E.T. Corrosion of alloy 718 in a mercury thermal convection loop, report, December 1, 1999; Oak Ridge, Tennessee. (digital.library.unt.edu/ark:/67531/metadc707137/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.