Intergranular corrosion of Zn-free and Zn-microalloyed Al-xCu-yLi alloys

J. F. Li, N. Birbilis, D. Y. Liu, Y. L. Chen, X. H. Zhang, C S Cai

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Abstract

The influence of 0.42 and 0.72. wt.% Zn on the intergranular corrosion (IGC) of Al-3.7Cu-1.15Li-0.5Mg and Al-2.7Cu-1.7Li-0.3Mg alloys (representing different Cu/Li ratios) was investigated. IGC dependence on ageing time was studied and a primitive IGC diagram established. With ageing, the potential of the Al. -xCu. -yLi alloys lowered due to precipitation, accompanied by grain boundary precipitate coarsening. Concomitantly, corrosion mode evolved with ageing from pitting and local IGC (early ageing), general IGC (under-aged), local IGC (near peak-aged) and pitting (over-aged). Of key interest is that Zn additions remarkably decreased the IGC sensitivity of the Al-2.7Cu-1.7Li-0.3Mg.

Original languageEnglish
Pages (from-to)44-57
Number of pages14
JournalCorrosion Science
Volume105
DOIs
Publication statusPublished - 1 Apr 2016

Keywords

  • A. Alloy
  • A. Aluminium
  • B. Polarization
  • B. TEM
  • C. Intergranular corrosion

Cite this

Li, J. F., Birbilis, N., Liu, D. Y., Chen, Y. L., Zhang, X. H., & Cai, C. S. (2016). Intergranular corrosion of Zn-free and Zn-microalloyed Al-xCu-yLi alloys. Corrosion Science, 105, 44-57. https://doi.org/10.1016/j.corsci.2016.01.001