Effects of Trace Rare Earth Ce on Microstructure and Corrosion Properties of Al-Zn-Mg Aluminum Alloy
XU Daofen1,2, CHEN Kanghua2,3, HU Guiyun2, CHEN Songyi2
1 Department of Mechanical Engineering, Guilin University of Aerospace Technology, Guilin 541104, China; 2 Light Alloy Research Institute, Central South University, Changsha 410083, China; 3 State Key Laboratory of Powder Metallurgy,Central South University, Changsha 410083, China
Abstract: The effect of rare earth (RE) Ce on microstructure and corrosion resistance of Al-Zn-Mg alloys was studied by optical microstructure, scanning electron microscopy (SEM), mechanical tensile testing, exfoliation corrosion testing, electrochemical impedance spectroscopy testing and slow strain rate tensile, etc. The results showed that trace of RE Ce was effective to improve the corrosion resistance properties of high strength Al-Zn-Mg alloys. The fracture time of stress corrosion was prolonged and the sensitivity was significantly reduced. The addition of 0.04% (mass fraction, the same below) Ce exhibited a little effect on the mechanical properties of aluminum alloy, but the corrosion resistance was improved distinctly. Thus the exfoliation corrosion was raised from EC to N. The passivation film resistance was raised from 14 655 Ω·cm2 to 36 839 Ω·cm2. The sensitivity index of stress corrosion was reduced from 0.612 to 0.219.
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2020, Vol. 34 
