The effects of Zr、Sc element on corrosion resistance of Al-Cu-Mg-Ag-Ti alloy were investigated by slow tensile

intergranular corrosion and electrochemical testing.The results reveal that the corrosion resistance of the alloy can be improved by adding Zr elements.Stress corrosion sensitivity factor(I

scc

)of Zr-containing alloys is lower than that of the Zr-free alloy.However

the compound addition of Zr and Sc can not further improve the corrosion resistance of the alloy.The addition of Zr can inhibit the recrystallization and make the precipitate free zone narrower

greatly improving the corrosion resistance of Al-Cu-Mg-Ag-Ti alloy.The comprehensive performance of Al-Cu-Mg-Ag-Ti alloy with 0.19%Zr presents the desirable comprehensive behavior

where the lowest depth of intergranular corrosion and the smallest I

scc

as well as the highest tensile strength can be obtained.In addition

the yield strength and tensile strength of the alloy with 0.19%Zr reach 466 MPa and 518 MPa

respectively.