【摘要】 为了研究织构对镁空气电池性能的影响,以商用AZ31镁合金板材为实验材料,分别制备了基于板材轧面和截面的镁空气电池。所用实验材料的表面粗糙度与实际应用中镁合金板材的表面粗糙度相似。通过电化学阻抗谱研究了试样的电化学性能,结果表明截面比轧面更耐腐蚀。通过恒流放电测试研究了电池的放电性能,结果表明基于截面阳极的镁空气电池和基于轧面阳极的镁空气电池相比具有更高的阳极效率(2种电池的阳极效率分别为71.3%和65.7%)。放电24 h之后,通过扫描电子显微镜研究了镁合金阳极基体的表面形貌。轧面阳极显示出一个具有更多孔洞和沟壑的阳极表面,这可能是导致它具有低阳极利用率的原因。因此,被(1010)、(1120)和(1011)取向晶粒所主导的截面阳极更适合运用于镁空气电池。更多还原

【Abstract】 Commercial rolled Mg-3Al-1Zn(AZ31) alloy sheet was used as the experimental material, an Mg-air battery based on its rolling surface(RS) and cross-section surface(CS) were both prepared to study the effect of texture on the performance of Mg-air battery. And the experimental samples had a similar surface roughness to practical application. The impedance spectroscopy(EIS) was used to investigate the electrochemical behavior of the samples. The results show that CS surface has a higher corrosion resistance compared with the RS surface. The battery performance was studied by constant current discharge test, and the results show that the Mg-air battery based on the CS surface anode has higher anode efficiency(71.3%) compared with the Mg-air battery based on the RS surface anode(65.7%). The surface morphologies of the magnesium alloy anodes substrate after discharged for 24 h were observed by scanning electron microscope. The RS anode exhibits a magnesium alloy anode substrate with more holes and gullies, which may contribute to its lower anode efficiency. Thus, the CS anode dominated by(1010),(1120) and(1011) orientated grains is more suitable to use on Mg-air battery.更多还原