织构对基于Mg-3Al-1Zn合金的镁空气电池性能的影响

The effect of texture on the performance of Mg-air battery based on rolled Mg-3Al-1Zn alloy sheet

摘要:

在本论文中，商用AZ31镁合金板材被用为实验材料。为了研究织构对镁空气电池性能的影响，分别制备了基于板材轧面和截面的镁空气电池。与已经报道过的关于织构对镁合金电化学性能的影响的研究不同，本文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，结果表明轧面比截面更耐腐蚀。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（两种电池的阳极效率分别为71.3%和65.7%）。放电24小时之后，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(10-10)、 (11-20) 和(10-11)取向晶粒所主导的轧面阳极更合适于被运用于镁空气电池。

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 surfaceSroughness to practical application, which was different to the reported studies (the studies about the influence of texture on the electrochemical behavior of Mg alloys). The impedance spectroscopy (EIS) was used to investigate the electrochemical behavior of the samples. The resusts showed that CS surface was more corrosion resistance compared with that of the RS surface. The battery performance was studied by constant current discharge test, the result showed that the Mg-air battery based on the CS surface anode has higher anode efficiency (71.3%) compared with that of the Mg-air battery based on the RS sursace anode (65.7%). The surface morphologies of the magnesium alloy anodes substrate after discharged for 24h were observed by scanning electron microscope. The RS anode exhibited a magnesium alloy anode substrate with more holes and gullies, which may contribute to its lower anode efficiency. Thus, the CS anode dominated by (10-10), (11-20) and (10-11) orientated grains was more suitable to be used on Mg-air battery.