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

DE2002761589

Publication Date	2000
Personal Author	Engelhardt, G. R.; MacDonald, D. D.
Page Count	8
Abstract	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.
Keywords	Nuclear energy Thermodynamics Atmospheric pressure Boiling Corrosion products Critical temperature Hydroxides Progress report Water vapor
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	SRI International, Menlo Park, CA.; Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200212
Contract Number	FG03-99SF21884

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

Nuclear Energy Research Initiative (NERI) Program. Technical progress report.
DE2002761589

Publication Date	2000
Personal Author	Engelhardt, G. R.; MacDonald, D. D.
Page Count	8
Abstract	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.
Keywords	Nuclear energy Thermodynamics Atmospheric pressure Boiling Corrosion products Critical temperature Hydroxides Progress report Water vapor
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	SRI International, Menlo Park, CA.; Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200212
Contract Number	FG03-99SF21884