Kinetics of the reaction between Mg-23.3%Ni eutectic alloy and hydrogen

Etsuo Akiba, K. Nomura, S. Ono, Y. Mizuno

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

The kinetics and the time dependence of the reaction between the Mg-23.3%Ni alloy and hydrogen and of the deactivation of the alloy are presented. The Mg-23.3%Ni alloy, which is a eutectic compound of magnesium and Mg2Ni, has the lowest melting point (507 °C) of the MgNi alloys. The rate of the reaction between the Mg-23.3%Ni alloy and hydrogen, which was measured by a constant-volume method, was expressed by the equation dn dt = k(P - Peqn where n is the hydrogen-to-magnesium ratio, P is the hydrogen pressure, Peq is the equilibrium pressure and k is the rate constant. With regard to the temperature dependence of the rate, the relation between In k and 1 T was not linear and hence the activation energy was not obtained. Prior to each run the hydrided alloy was dehydrided in a vacuum and was then pretreated by introducing a specific amount of hydrogen into the system. The reaction rate decreased with the time elapsed after pretreatment. Normal pretreatment together with full hydriding reactivated the alloy to its original level.

Original languageEnglish
Pages (from-to)145-150
Number of pages6
JournalJournal of the less-common metals
Volume89
Issue number1
DOIs
Publication statusPublished - Jan 1 1983

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Eutectics
Hydrogen
Kinetics
Magnesium
Magnesium Compounds
Reaction rates
Melting point
Rate constants
Activation energy
Vacuum

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Kinetics of the reaction between Mg-23.3%Ni eutectic alloy and hydrogen. / Akiba, Etsuo; Nomura, K.; Ono, S.; Mizuno, Y.

In: Journal of the less-common metals, Vol. 89, No. 1, 01.01.1983, p. 145-150.

Research output: Contribution to journalArticle

Akiba, Etsuo ; Nomura, K. ; Ono, S. ; Mizuno, Y. / Kinetics of the reaction between Mg-23.3%Ni eutectic alloy and hydrogen. In: Journal of the less-common metals. 1983 ; Vol. 89, No. 1. pp. 145-150.
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N2 - The kinetics and the time dependence of the reaction between the Mg-23.3%Ni alloy and hydrogen and of the deactivation of the alloy are presented. The Mg-23.3%Ni alloy, which is a eutectic compound of magnesium and Mg2Ni, has the lowest melting point (507 °C) of the MgNi alloys. The rate of the reaction between the Mg-23.3%Ni alloy and hydrogen, which was measured by a constant-volume method, was expressed by the equation dn dt = k(P - Peqn where n is the hydrogen-to-magnesium ratio, P is the hydrogen pressure, Peq is the equilibrium pressure and k is the rate constant. With regard to the temperature dependence of the rate, the relation between In k and 1 T was not linear and hence the activation energy was not obtained. Prior to each run the hydrided alloy was dehydrided in a vacuum and was then pretreated by introducing a specific amount of hydrogen into the system. The reaction rate decreased with the time elapsed after pretreatment. Normal pretreatment together with full hydriding reactivated the alloy to its original level.

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