《Table 2 Electrochemical corrosion parameters of Al-Cu-Li alloy weldment in 3.5%Na Cl solution》

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《时效处理对铝锂合金电子束焊接头耐蚀性能的影响（英文）》

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Note:self-corrosion potential，Ecorr；self-corrosion current，Icorr；pitting corrosion potential，Epit；passivation interval，（Epit-Ecorr）

The EXCO is closely related to IGC；it usually develops from pitting corrosion to IGC，and rapidly expands along grain boundary.When the grain boundary is corroded to form corrosion path，the wedge tension will be produced to ambient grains，and it causes tearing of non-corroded parts；the exfoliation occurs in a large area，and even makes alloy break up[4].The morphologies of Al-Cu-Li alloy joint immersed in EXCO solution before and after PWHT are shown in Fig.4.The course of EXCO development of Al-Cu-Li alloy joint is given in Table 1.