Fatigue Resistance of Al‐Cu‐Li and Comparison with 7xxx Aerospace Alloys

Daniélou, Armelle; Ronxin, J. P.; and, C. Nardin; Ehrström, Jc.

doi:10.1002/9781118495292.ch74

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“…Several studies have shown that Al-Cu-Li alloys have better corrosion resistance compared to other conventional Al alloys [2,4,10]. However, the corrosion behavior of Al-Cu-Li alloy is still an open subject as Li is considered as one of the possible factors of the alloy instability and leads to a complex corrosion behavior [11,12].…”

Section: Introductionmentioning

confidence: 99%

Insights on the Al-Cu-Fe-Mn intermetallic particles induced pitting corrosion of Al-Cu-Li alloy

Seyeux

Wiame

et al. 2020

Corrosion Science

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The pitting corrosion and surface modifications of aluminium alloy AA2050-T8 (Al-Cu-Li) resulting from immersion in 0.1M NaCl at open circuit potential were studied by time-offlight secondary ion mass spectrometry (ToF-SIMS). ToF-SIMS chemical mapping showed a local distribution of chlorides and hydroxides in the pits enriched in Cu and Fe. Preferential sites of corrosion initiation were evidenced in the alloy matrix close to Al-Fe-Cu-Mn intermetallic particle. A formation of an oxide-hydroxide layer with different composition and/or higher thickness was evidenced over IMP than the alloy matrix. LiOx dissolved from the oxide layer but metallic lithium was still present in the matrix.

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