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Title: Reaction rates and prediction of thermal instability during aluminum alloy 6061 dissolution

Abstract

Here, chemical kinetics of dissolution of aluminum alloy 6061 was investigated for the processing of Pu-238 for deep space missions. The rate of dissolution was measured by the heat release and appeared to be controlled by the rate of release of Al(OH) 4 from the metal surface. Rates of reaction were measured from 273 to 365 K, giving an activation energy of 72 ± 13 kJ•(mol Al) –1 and a pre-exponential factor of 5 ± 3 × 10 9 dm 3mol –1min –1. Minor alloying elements did not appear to affect the reaction kinetics. The average heat of dissolution was –360 ± 70 kJ•(mol NaAlO 2) –1. When extrapolated to an infinitely dilute solution of aluminum, kJ•(mol NaAlO 2) –1.

Authors:
 [1];  [1];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1440837
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Separation Science and Technology
Additional Journal Information:
Journal Volume: 53; Journal Issue: 12; Journal ID: ISSN 0149-6395
Publisher:
Taylor & Francis
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Aluminum alloy 6061 dissolution; kinetics of aluminum dissolution; neptunium target cladding dissolution; plutonium-238 production

Citation Formats

McFarlane, J., DePaoli, D. W., and Mattus, C. H. Reaction rates and prediction of thermal instability during aluminum alloy 6061 dissolution. United States: N. p., 2017. Web. doi:10.1080/01496395.2017.1377245.
McFarlane, J., DePaoli, D. W., & Mattus, C. H. Reaction rates and prediction of thermal instability during aluminum alloy 6061 dissolution. United States. doi:10.1080/01496395.2017.1377245.
McFarlane, J., DePaoli, D. W., and Mattus, C. H. Fri . "Reaction rates and prediction of thermal instability during aluminum alloy 6061 dissolution". United States. doi:10.1080/01496395.2017.1377245. https://www.osti.gov/servlets/purl/1440837.
@article{osti_1440837,
title = {Reaction rates and prediction of thermal instability during aluminum alloy 6061 dissolution},
author = {McFarlane, J. and DePaoli, D. W. and Mattus, C. H.},
abstractNote = {Here, chemical kinetics of dissolution of aluminum alloy 6061 was investigated for the processing of Pu-238 for deep space missions. The rate of dissolution was measured by the heat release and appeared to be controlled by the rate of release of Al(OH)4– from the metal surface. Rates of reaction were measured from 273 to 365 K, giving an activation energy of 72 ± 13 kJ•(mol Al)–1 and a pre-exponential factor of 5 ± 3 × 109 dm3mol–1min–1. Minor alloying elements did not appear to affect the reaction kinetics. The average heat of dissolution was –360 ± 70 kJ•(mol NaAlO2)–1. When extrapolated to an infinitely dilute solution of aluminum, kJ•(mol NaAlO2)–1.},
doi = {10.1080/01496395.2017.1377245},
journal = {Separation Science and Technology},
number = 12,
volume = 53,
place = {United States},
year = {2017},
month = {11}
}

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