Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 42, Issue 1, Pages 699-710Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2016.10.126
Keywords
Multichannel hydrogen diffusion; Vacuum hot extraction; Vacuum melting extraction; Melting in argon carrier; Argon carrier fusion method; Measurement of the hydrogen concentration
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Funding
- Russian Science Foundation [15-19-00091]
- Russian Science Foundation [15-19-00091] Funding Source: Russian Science Foundation
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Measurements have been performed of the hydrogen contents in reference samples of aluminum alloy using the methods of vacuum hot extraction, vacuum melting and melting into the graphite crucible in the flux of gas carrier or argon carrier fusion method. The effect of additional squeezing out of hydrogen from the metal under its crystallization was not observed. It has been shown that during the sample heating time typical for the analysis by argon carrier fusion method the bound hydrogen with high activation energy is not extracted completely. This leads to errors in performed measurements. It has been proved that the mean velocity of hydrogen transport and mean coefficients of diffusion depend on the initial population of the energy levels, and they can vary for the same material. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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