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.
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