Effect of impurities and air exposure on hydrogen absorbing properties of MgNi alloys

The effects of impurities, especially CO 2, and exposure to air on the hydrogen absorbing behaviour of Mg-5wt.%Ni, Mg-10wt.%Ni and Mg 2Ni are studied. Treatment with pure N 2 and CO 2 at room temperature and hydrogenation using H 2N 2 and H 2-CH 4 mixtures does not affect the reactivity of Mg 2Ni....

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Bibliographic Details
Published in:Journal of the less-common metals 1986-06, Vol.120 (2), p.163-169
Main Authors: Ishido, Yoshihiko, Ono, Shuichiro, Akiba, Etsuo
Format: Article
Language:English
Subjects:
Applications
Applied sciences
Cross-disciplinary physics: materials science
rheology
Engineering techniques in metallurgy. Applications. Other aspects
Exact sciences and technology
Materials science
Metals, semimetals and alloys
Metals. Metallurgy
Others aspects
Physics
Specific materials
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Summary:The effects of impurities, especially CO 2, and exposure to air on the hydrogen absorbing behaviour of Mg-5wt.%Ni, Mg-10wt.%Ni and Mg 2Ni are studied. Treatment with pure N 2 and CO 2 at room temperature and hydrogenation using H 2N 2 and H 2-CH 4 mixtures does not affect the reactivity of Mg 2Ni. When hydrogen with 1% CO 2 is used for hydriding Mg 2Ni and Mg-5wt.%Ni in a batch type reactor, the hydrogen capacity of Mg 2Ni is not changed while hydrogen is not fully desorbed from Mg-5wt.%Ni. In the case of Mg-5wt.%Ni H 2O formed from CO 2 and H 2 is considered to hinder desorption of hydrogen from the hydride. Exposure of hydrided and dehydrided samples to the air shows a slight effect on hydrogen capacity of those alloys.
ISSN:0022-5088
DOI:10.1016/0022-5088(86)90641-7