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Hydrogen Degradation Property of Electrochemically Charged Aluminum

Published online by Cambridge University Press:  01 February 2011

Hiroshi Suzuki ,
Daisuke Kobayashi ,
Kenichi Takai  and
Yukito Hagihara
Hiroshi Suzuki
Affiliation:
h-suzuki@me.sophia.ac.jp, Sophia University, Mechanical Engineering, 7-1 Kioi-cho, Chiyoda-ku, Tokyo, 102-8554, Japan, +81-3-3238-3342, +81-3-3238-3311
Daisuke Kobayashi
Affiliation:
d-kobaya@sophia.ac.jp, Sophia University, Dept. Mechanical Engineering, 7-1 Kioi-cho, Chiyoda-ku, Tokyo, 102-8554, Japan
Kenichi Takai
Affiliation:
takai@me.sophia.ac.jp, Sophia University, Dept. Mechanical Engineering, 7-1 Kioi-cho, Chiyoda-ku, Tokyo, 102-8554, Japan
Yukito Hagihara
Affiliation:
hagihara@me.sophia.ac.jp, Sophia University, Dept. Mechanical Engineering, 7-1 Kioi-cho, Chiyoda-ku, Tokyo, 102-8554, Japan
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Abstract

Degradation property of aluminum due to hydrogen is studied. Hydrogen is introduced by electrolysis charge in aqueous solution with addition of 0.1 mass % NH4SCN as a hydrogen recombination poison. The amount of hydrogen and its existing state in the material is analyzed by hydrogen desorption curves measured by the thermal desorption spectroscopy. The hydrogen desorption curves of charged aluminum showed two peaks, one at less than 100 °C and the other around 400 °C. The existing state of hydrogen relate to each peaks are identified as weakly trapped solute hydrogen to vacancy and free hydrogen molecule located in cavities that exists in the bulk of the material. Tensile properties are obtained to determine degradation property of the material due to hydrogen. The effect of hydrogen on degradation of charged aluminum is analyzed in terms of interaction between hydrogen and vacancy or dislocation. Solute hydrogen and cavities are found to affect ductility of aluminum, whereas hydrogen molecule in cavities has no effect.

Keywords

AlHabsorption
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1042: Symposium S – Materials and Technology for Hydrogen Storage , 2007 , 1042-S03-11
Copyright
Copyright © Materials Research Society 2008

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