Effect of Cu content on local corrosion behavior of Al-Li alloy
The effect of three Cu contents on the local corrosion behavior of Al-Li alloy were investigated by the intergranular corrosion,exfoliation corrosion and electrochemical experiment,combined with optical microscopy,scanning electron microscopy and transmission electron microscopy.The results show that the level of corrosion resistance of Al-Li alloys with three different Cu contents are 3.15Cu,3.88Cu and 3.63Cu in order from good to bad.The number of coarse phase and T1 phase in 3.15Cu alloy is the least,the corrosion depth is the shallowest,the corrosion current density is the smallest,and the capacitive arc radius is the largest,which has the best corrosion resistance.Compared with 3.15Cu alloy,the number of coarse phase and T1 phase in 3.63Cu and 3.88Cu alloys increases,which makes the corrosion of the alloys easier to initiate and expand,resulting in poor corrosion resistance.Compared with 3.63Cu alloy,the potential difference between the coarse phase and the matrix in 3.88Cu alloy decreases,which slightly improves the corrosion resistance.
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