Effect of prior deformation and heat treatment on the corrosion-induced hydrogen trapping in aluminium alloy 2024
•The nature of hydrogen trapping during corrosion in 2024 alloy has been revealed.•The high temperature (500°C) trap state is associated with the S-phase (Al2CuMg).•In the absence of the S-phase, hydrogen is being trapped at vacancies.•The 400°C trap state is associated with dislocations.•High plast...
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Published in | Corrosion science Vol. 80; pp. 139 - 142 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Kidlington
Elsevier Ltd
01.03.2014
Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | •The nature of hydrogen trapping during corrosion in 2024 alloy has been revealed.•The high temperature (500°C) trap state is associated with the S-phase (Al2CuMg).•In the absence of the S-phase, hydrogen is being trapped at vacancies.•The 400°C trap state is associated with dislocations.•High plastic strains lead to a reduction of hydrogen trapped at dislocations and the S-phase.
The nature of the corrosion-induced hydrogen trapping in Al-alloy 2024-T351 was studied by thermal desorption spectroscopy. The microstructure was altered by solution treatment and plastic deformation, prior to corrosion. The results showed that the high temperature, 500°C, trap state (T4 state) is associated with the S-phase. In the absence of S-phase, hydrogen is trapped at vacancies, which liberate hydrogen at higher temperatures. Plastic deformation prior to corrosion revealed that the trap state at 400°C (T3 state) is associated with dislocations. High plastic strains (above 0.06) lead to a reduction of hydrogen trapped in both dislocations and the S-phase. |
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ISSN: | 0010-938X 1879-0496 |
DOI: | 10.1016/j.corsci.2013.11.021 |