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Local scanning electrochemical microscopy analysis of a lithium-based conversion layer on AA2024-T3 at progressive stages of formation

Journal Article (2023)
Authors

Z. Li (TU Delft - Team Arjan Mol)

Gaojie Li (TU Delft - Team Maria Santofimia Navarro)

Peter Visser (Akzo Nobel)

Axel M. Homborg (TU Delft - Team Arjan Mol, Netherlands Defence Academy)

Y. Gonzalez-Garcia (TU Delft - Team Yaiza Gonzalez Garcia)

Johannes M.C. Mol (TU Delft - Team Arjan Mol)

Research Group
Team Maria Santofimia Navarro
Copyright
© 2023 Z. Li, G. Li, Peter Visser, A.M. Homborg, Y. Gonzalez Garcia, J.M.C. Mol
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Publication Year
2023
Language
English
Copyright
© 2023 Z. Li, G. Li, Peter Visser, A.M. Homborg, Y. Gonzalez Garcia, J.M.C. Mol
Related content
Research Group
Team Maria Santofimia Navarro
Volume number
469
DOI:
https://doi.org/10.1016/j.electacta.2023.143270
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Abstract

Scanning electrochemical microscopy (SECM) is employed to characterize the evolution of local electrochemical surface activity during lithium-based conversion layer formation on legacy aerospace aluminium alloy AA2024-T3. Initially, three types of studied intermetallic particles - S-, θ- and constituent phases - act as active cathodic areas. Subsequently, θ- and constituent phases show passivation preceding that of S-phase particles during the later conversion layer formation stages. The entire surface, including the matrix region, shows a higher reactivity at the beginning and then gradually shows decreasing reactivity. Hydrogen evolution-generated bubbles attach to the alloy surface and locally hinder the conversion layer formation, weakening the corrosion protection the conversion layer provides at those locations.