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

J. McFarlane; D. W. DePaoli; C. H. Mattus

doi:10.1080/01496395.2017.1377245

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

J. McFarlane, D. W. DePaoli, C. H. Mattus

Fuel Cycle Chemical Technology

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Abstract

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, (Formula presented.) kJ⋅(mol NaAlO₂)⁻¹.

Original language	English
Pages (from-to)	1894-1905
Number of pages	12
Journal	Separation Science and Technology (Philadelphia)
Volume	53
Issue number	12
DOIs	https://doi.org/10.1080/01496395.2017.1377245
State	Published - Aug 13 2018

Funding

This work was supported by the Pu-238 Production Project and UT-Battelle, under Contract DEAC05-00OR22725 with the US Department of Energy.

Keywords

Aluminum alloy 6061 dissolution
kinetics of aluminum dissolution
neptunium target cladding dissolution
plutonium-238 production

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10.1080/01496395.2017.1377245

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title = "Reaction rates and prediction of thermal instability during aluminum alloy 6061 dissolution",

abstract = "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, (Formula presented.) kJ⋅(mol NaAlO2)−1.",

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AB - 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, (Formula presented.) kJ⋅(mol NaAlO2)−1.

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

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