Nuclear Energy Research Initiative (NERI) Program. Technical progress report

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During the past quartile the authors have explored the thermodynamics of various metal hydroxide and oxyhydroxide dehydration reactions of iron, nickel, and chromium with the objective of estimating the critical temperature, T{sub cr}. This is the temperature at which the oxide is in equilibrium with the oxyhydroxide or hydroxide and water vapor under the expected repository conditions of temperature and pressure. Because localized corrosion requires the presence of an ionically conducting phase on the surface (to support oxygen reduction) T{sub cr} is also the temperature below which ''wet'' corrosion first becomes possible. Past analyses have assumed that wet corrosion requires ... continued below

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8 pages

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Engelhardt, G.R. & MacDonald, D.D. January 30, 2000.

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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. More information about this report can be viewed below.

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Description

During the past quartile the authors have explored the thermodynamics of various metal hydroxide and oxyhydroxide dehydration reactions of iron, nickel, and chromium with the objective of estimating the critical temperature, T{sub cr}. This is the temperature at which the oxide is in equilibrium with the oxyhydroxide or hydroxide and water vapor under the expected repository conditions of temperature and pressure. Because localized corrosion requires the presence of an ionically conducting phase on the surface (to support oxygen reduction) T{sub cr} is also the temperature below which ''wet'' corrosion first becomes possible. Past analyses have assumed that wet corrosion requires the presence of a layer of bulk water on the surface and hence that corrosion is not possible at temperatures above the boiling temperature of bulk water under the prevailing atmospheric pressure. Furthermore, significant elevation of the boiling temperature may occur if the aqueous phase becomes concentrated in salts. Because of the hydration of hygroscopic corrosion products, which may occur at significantly higher temperatures than the boiling temperature of water, and because of boiling temperature elevation effects, the past assumption needs to be reevaluated. This is the primary goal of this work.

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8 pages

Notes

OSTI as DE00761589

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  • Other Information: PBD: 30 Jan 2000

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  • Report No.: None
  • Grant Number: FG03-99SF21884
  • DOI: 10.2172/761589 | External Link
  • Office of Scientific & Technical Information Report Number: 761589
  • Archival Resource Key: ark:/67531/metadc717277

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  • January 30, 2000

Added to The UNT Digital Library

  • Sept. 29, 2015, 5:31 a.m.

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  • March 29, 2016, 8:23 p.m.

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Engelhardt, G.R. & MacDonald, D.D. Nuclear Energy Research Initiative (NERI) Program. Technical progress report, report, January 30, 2000; United States. (digital.library.unt.edu/ark:/67531/metadc717277/: accessed August 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.