Analysis of hydrogen diffusion in the three stage electro-permeation test
The presence of hydrogen traps within a metallic alloy influences the rate of hydrogen diffusion. The electro-permeation (EP) test can be used to assess this: the permeation of hydrogen through a thin metallic sheet is measured by suitable control of hydrogen concentration on the front face and by r...
| Main Authors: | , , , |
|---|---|
| Format: | Journal article |
| Language: | English |
| Published: |
Springer
2023
|
| _version_ | 1826315377185914880 |
|---|---|
| author | Raina, A Deshpande, VS Martínez-Pañeda, E Fleck, NA |
| author_facet | Raina, A Deshpande, VS Martínez-Pañeda, E Fleck, NA |
| author_sort | Raina, A |
| collection | OXFORD |
| description | The presence of hydrogen traps within a metallic alloy influences the rate of hydrogen diffusion. The electro-permeation (EP) test can be used to assess this: the permeation of hydrogen through a thin metallic sheet is measured by suitable control of hydrogen concentration on the front face and by recording the flux of hydrogen that exits the rear face. Additional insight is achieved by the more sophisticated three stage EP test: the concentration of free lattice hydrogen on the front face is set to an initial level, is then dropped to a lower intermediate value and is then restored to the initial level. The flux of hydrogen exiting the rear face is measured in all three stages of the test. In the present study, a transient analysis is performed of hydrogen permeation in a three stage EP test, assuming that lattice diffusion is accompanied by trapping and de-trapping. The sensitivity of the three stage EP response to the depth and density of hydrogen traps is quantified. A significant difference in permeation response can exist between the first and third stages of the EP test when the alloy contains a high number density of deep traps. |
| first_indexed | 2024-03-07T08:29:42Z |
| format | Journal article |
| id | oxford-uuid:c4826ef9-eb33-4305-8778-b80ea1650cf6 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-12-09T03:24:22Z |
| publishDate | 2023 |
| publisher | Springer |
| record_format | dspace |
| spelling | oxford-uuid:c4826ef9-eb33-4305-8778-b80ea1650cf62024-11-25T16:21:35ZAnalysis of hydrogen diffusion in the three stage electro-permeation testJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:c4826ef9-eb33-4305-8778-b80ea1650cf6EnglishSymplectic ElementsSpringer2023Raina, ADeshpande, VSMartínez-Pañeda, EFleck, NAThe presence of hydrogen traps within a metallic alloy influences the rate of hydrogen diffusion. The electro-permeation (EP) test can be used to assess this: the permeation of hydrogen through a thin metallic sheet is measured by suitable control of hydrogen concentration on the front face and by recording the flux of hydrogen that exits the rear face. Additional insight is achieved by the more sophisticated three stage EP test: the concentration of free lattice hydrogen on the front face is set to an initial level, is then dropped to a lower intermediate value and is then restored to the initial level. The flux of hydrogen exiting the rear face is measured in all three stages of the test. In the present study, a transient analysis is performed of hydrogen permeation in a three stage EP test, assuming that lattice diffusion is accompanied by trapping and de-trapping. The sensitivity of the three stage EP response to the depth and density of hydrogen traps is quantified. A significant difference in permeation response can exist between the first and third stages of the EP test when the alloy contains a high number density of deep traps. |
| spellingShingle | Raina, A Deshpande, VS Martínez-Pañeda, E Fleck, NA Analysis of hydrogen diffusion in the three stage electro-permeation test |
| title | Analysis of hydrogen diffusion in the three stage electro-permeation test |
| title_full | Analysis of hydrogen diffusion in the three stage electro-permeation test |
| title_fullStr | Analysis of hydrogen diffusion in the three stage electro-permeation test |
| title_full_unstemmed | Analysis of hydrogen diffusion in the three stage electro-permeation test |
| title_short | Analysis of hydrogen diffusion in the three stage electro-permeation test |
| title_sort | analysis of hydrogen diffusion in the three stage electro permeation test |
| work_keys_str_mv | AT rainaa analysisofhydrogendiffusioninthethreestageelectropermeationtest AT deshpandevs analysisofhydrogendiffusioninthethreestageelectropermeationtest AT martinezpanedae analysisofhydrogendiffusioninthethreestageelectropermeationtest AT fleckna analysisofhydrogendiffusioninthethreestageelectropermeationtest |