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

Ziyu Li*, Gaojie Li, Peter Visser, Axel Homborg, Yaiza Gonzalez-Garcia, Arjan Mol

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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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.

Original languageEnglish
Article number143270
Number of pages12
JournalElectrochimica Acta
Volume469
DOIs
Publication statusPublished - 2023

Keywords

  • Aluminium alloy
  • Inhibitor
  • Lithium-based conversion layer
  • SECM

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