摘要
The effects of trace Ce on the microstructure,mechanical properties and corrosion resistance of Al-Zn-Mg alloy were studied by means of metallographic analysis,scanning electron microscopy(SEM),mechanical tensile test,slow strain rate tensile test,cyclic polarization curve test,electrochemical impedance spectroscopy test and anodic oxidation test.The results show that the addition of trace Ce has little effect on the strength of Al-Zn-Mg alloy,but can significantly improve the corrosion resistance of the alloy;The mechanical properties and corrosion resistance of the alloys decrease significantly with the addition of excessive Ce;the addition of 0.04 wt%Ce can reduce significantly the self-corrosive current density of AlZn-Mg alloy and increase obviously passivation film resistance of the alloy.The stress corrosion sensitivity index decreases from 0.612 to 0.219,which improves the corrosion resistance properties significantly.
基金
Major Research Equipment Development Projects of the National Natural Science Foundation of China(No.51327902)
National Basic Research Program of China(No.2012CB619502)
National Key Research and Development Program of China(Manufacture and Application Technology of High Performance Aluminum Alloy large size plate and strip 2016ZDYF0YSY01)
National Natural Science Foundation of China(No.51201186)
Graduate Students Explore Innovation Projects(2016zzts317,502200745)。
