Corrosion of high temperature alloys in solar salt at 400, 500, and 680%C2%B0C.

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Corrosion tests at 400, 500, and 680%C2%B0C were performed using four high temperature alloys; 347SS, 321SS In625, and HA230. Molten salt chemistry was monitored over time through analysis of nitrite, carbonate, and dissolved metals. Metallography was performed on alloys at 500 and 680%C2%B0C, due to the relatively thin oxide scale observed at 400%C2%B0C. At 500%C2%B0C, corrosion of iron based alloys took the form of chromium depletion and iron oxides, while nickel based alloys also had chromium depletion and formation of NiO. Chromium was detected in relatively low concentrations at this temperature. At 680%C2%B0C, significant surface corrosion occurred with metal losses ... continued below

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45 p.

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Kruizenga, Alan Michael; Gill, David Dennis & LaFord, Marianne Elizabeth September 1, 2013.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Laboratories (SNL-CA), Livermore, CA (United States)
    Place of Publication: Livermore, California

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Corrosion tests at 400, 500, and 680%C2%B0C were performed using four high temperature alloys; 347SS, 321SS In625, and HA230. Molten salt chemistry was monitored over time through analysis of nitrite, carbonate, and dissolved metals. Metallography was performed on alloys at 500 and 680%C2%B0C, due to the relatively thin oxide scale observed at 400%C2%B0C. At 500%C2%B0C, corrosion of iron based alloys took the form of chromium depletion and iron oxides, while nickel based alloys also had chromium depletion and formation of NiO. Chromium was detected in relatively low concentrations at this temperature. At 680%C2%B0C, significant surface corrosion occurred with metal losses greater than 450microns/year after 1025hours of exposure. Iron based alloys formed complex iron, sodium, and chromium oxides. Some data suggests grain boundary chromium depletion of 321SS. Nickel alloys formed NiO and metallic nickel corrosion morphologies, with HA230 displaying significant internal oxidation in the form of chromia. Nickel alloys both exhibited worse corrosion than iron based alloys likely due to preferential dissolution of chromium, molybdenum, and tungsten.

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45 p.

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  • Report No.: SAND2013-8256
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 1104752
  • Archival Resource Key: ark:/67531/metadc868886

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Office of Scientific & Technical Information Technical Reports

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  • September 1, 2013

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  • Sept. 16, 2016, 12:32 a.m.

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  • Feb. 17, 2017, 4:20 p.m.

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Kruizenga, Alan Michael; Gill, David Dennis & LaFord, Marianne Elizabeth. Corrosion of high temperature alloys in solar salt at 400, 500, and 680%C2%B0C., report, September 1, 2013; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc868886/: accessed December 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.