Al对Mg-Al-Pb镁阳极组织和电化学性能的影响

Effect of Al on microstructure and electrochemical properties of Mg-Al-Pb magnesium anode

采用扫描电镜、光学显微镜、X射线衍射研究了不同含量Al对Mg-x%Al-5%Pb(AP65)阳极材料的铸态及轧制退火态微观组织结构的影响,通过动电位极化法、恒电流法研究该系镁合金的电化学性能,并将研究结果与常规的AZ31镁合金进行对比。结果表明:随着Al含量的增加,铸态Mg-x%Al-5%Pb(x=3、6、9)合金中都存在β-Mg17Al12相与Mg2Pb相,且晶粒尺寸变小;经过轧制退火后,Mg-x%Al-5%Pb(x=3、6)镁合金中β-Mg17Al12相消失,只存在Mg2Pb相;同时,Mg-6%Al-5%Pb(AP65)镁阳极组装成的金属-空气电池在电池放电过程中表现出良好的电化学性能。

The effect of the casting and rolling annealing microstructures of Mg-x%Al-5%Pb(AP65)anode materials with different content of Al was studied by means of SEM,optical microscope and X-ray diffraction,and was compared with AZ31 magnesium alloy.The results show that bothβ-Mg17 Al12 phase and Mg2 Pb phase exist in the as-cast Mg-x%Al-5%Pb(x=3,6,9)alloy,and the grains become smaller with the increase of Al content.β-Mg17 Al12 phase disappears and only Mg2 Pb phase existes in Mg-x%Al-5%Pb(x=3,6)via rolling annealing.Meanwhile,Mg-6%Al-5%Pb(AP65)magnesium anode assembled into a metal-air battery that shows good electrochemical properties during the battery discharge process.