Thermogravimetric analysis studies

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Independent of thermal loading scenarios, the waste packages at the proposed repository at Yucca Mountain, Nevada will be exposed to environmental conditions of temperatures below 100 C with a range of possible relative humidities. Under high relative humidities, the formation of thin water films on the metal surfaces will occur. Previous work at ambient conditions has shown that on susceptible metals, the water-film-covered metal has an enhanced corrosion rate relative to the dry oxidation of the metal. The transition relative humidity where oxidation changes from dry oxidation to aqueous electrochemical corrosion is called the critical relative humidity. Determination of this ... continued below

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1544 Kilobytes pages

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Gdowski, G. August 25, 1995.

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Description

Independent of thermal loading scenarios, the waste packages at the proposed repository at Yucca Mountain, Nevada will be exposed to environmental conditions of temperatures below 100 C with a range of possible relative humidities. Under high relative humidities, the formation of thin water films on the metal surfaces will occur. Previous work at ambient conditions has shown that on susceptible metals, the water-film-covered metal has an enhanced corrosion rate relative to the dry oxidation of the metal. The transition relative humidity where oxidation changes from dry oxidation to aqueous electrochemical corrosion is called the critical relative humidity. Determination of this transition is important in estimating the performance of the candidate materials (especially corrosion allowance materials), because of the marked increase in degradation rate above the critical relative humidity, typically 10-10{sup 2} times This activity is concerned with short term measurements of corrosion and oxidation rates using a high sensitivity microbalance. The experimental work will determine the critical humidity level for candidate metals under a variety of conditions. From the literature, the critical humidity level typically are around 70% relative humidity, but this level is affected by the metal, gas composition, temperature, and the presence of contaminants on the surface, particularly contaminants that are deliquescent. A series of experiments will bracket a range of humidity, temperature, metal alloy, and surface condition.

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1544 Kilobytes pages

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  • Other Information: PBD: 25 Aug 1995

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  • Report No.: UCRL-ID-132289
  • Grant Number: W-7405-ENG-48
  • DOI: 10.2172/2803 | External Link
  • Office of Scientific & Technical Information Report Number: 2803
  • Archival Resource Key: ark:/67531/metadc667081

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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.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • August 25, 1995

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

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  • Sept. 25, 2017, 4:34 p.m.

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Gdowski, G. Thermogravimetric analysis studies, report, August 25, 1995; California. (digital.library.unt.edu/ark:/67531/metadc667081/: accessed November 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.