Effect of prior deformation and heat treatment on the corrosion-induced hydrogen trapping in aluminium alloy 2024

• Published in: Corrosion science Vol. 80; pp. 139 - 142
• Main Authors: Kamoutsi, H., Haidemenopoulos, G.N., Bontozoglou, V., Petroyiannis, P.V., Pantelakis, Sp.G.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.03.2014; Elsevier
• Subjects: A. Aluminium; Applied sciences; C. Effects of strain; C. Exfoliation corrosion; C. Hydrogen absorption; Corrosion; Corrosion environments; Exact sciences and technology; Metals. Metallurgy; A. Aluminium; C. Exfoliation corrosion; C. Effects of strain; C. Hydrogen absorption; Trapping; Heat treatment; Absorption; Aluminium base alloys; Deformation; Hydrogen; Exfoliation corrosion
• ISSN: 0010-938X; 1879-0496
• DOI: 10.1016/j.corsci.2013.11.021

•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.