An investigation of the corrosion inhibitive layers generated from lithium oxalatecontaining organic coating on AA2024-T3 aluminium alloy

Yanwen Liu, Peter Visser, Xiaorong Zhou, Stuart Lyon, Teruo Hashimoto, Ali Gholinia, George Thompson, Gerard Smyth, Simon Gibbon, Derek Graham, J.M.C. Mol, Herman Terryn

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The protective film formed in a defect by leaching of lithium oxalate from model organic coatings during neutral salt spray exposure has been investigated. A scribed area of about 1mm width was introduced on the coated AA2024-T3 aluminium alloy. The scribed area was examined before and after exposure in neutral salt spray environment for 4, 8, 24 and 168 h by scanning and transmission electron microscopies. Itwas found that the lithiumoxalatewas able to leach fromthe organic coating during neutral salt spray exposure and it promoted the formation of a film that provided effective corrosion protection to the alloy. The typical film morphology consists of three different layers, including a relatively compact layer near the alloy substrate, a porous middle layer and a columnar outer layer. Variation of the filmmorphology was also observed at different locations of the scribed alloy surface, which may be related to the difference of local concentration of lithium species. Electron energy loss spectroscopy detected
    lithium, aluminium and oxygen in the film. Although the film showed the varied morphologies in different regions of the scribed
    area, the alloy substrate was protected from corrosion when the film was formed.
    Original languageEnglish
    Pages (from-to)798–803
    JournalSurface and Interface Analysis
    Volume48
    Issue number8
    Early online date7 Mar 2016
    DOIs
    Publication statusPublished - 6 Jul 2016

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