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为选择一种高性价比的镁电池阳极材料,借助电化学工作站、光学显微镜(OM)、扫描电子显微镜(SEM)和X射线能谱分析(EDS)对不同加工状态的AZ31B镁合金电化学性能进行研究。分别将挤压、轧制、铸轧和铸态AZ31B镁合金作为阳极材料,测试其电化学性能。结果表明,在4种加工状态下,挤压态镁合金是性价比最高的一种阳极材料;其组织由均匀细小的晶粒和第二相组成,拥有最负的平衡电位,最低腐蚀电流密度和最小自腐蚀速率;挤压态样品腐蚀后,表面产生疏松细小,且均匀分布的腐蚀产物,降低了阳极极化,增加了阳极利用率。轧制和铸轧态的AZ31B镁合金的电化学活性和耐蚀性能相对挤压态的较低。铸态AZ31B镁合金由于较粗大的晶粒、第二相和铸造缺陷,表现出不稳定的放电曲线和较正的放电电位。不同状态AZ31镁合金的腐蚀均以点蚀为主。
In order to choose a cost-effective magnesium battery anode material, the electrochemical performance of AZ31B magnesium alloy with different processing conditions was investigated by means of electrochemical workstation, OM, SEM and X-ray photoelectron spectroscopy (EDS) the study. The extruded, rolled, cast-rolled and as-cast AZ31B magnesium alloy as the anode material, the electrochemical properties of the test. The results show that extruded magnesium alloy is one of the most cost-effective anode materials under four processing conditions. The microstructure consists of uniform and fine grains and the second phase, possesses the most negative equilibrium potential, the lowest corrosion current density and The minimum self-corrosion rate; extruded state sample corrosion, the surface loose small, uniform distribution of corrosion products, reducing the anode polarization, an increase of anode utilization. AZ31B magnesium alloy rolling and casting conditions of the electrochemical activity and corrosion resistance relative extrusion state is lower. The as-cast AZ31B magnesium alloy exhibits unstable discharge curves and a more positive discharge potential due to coarser grains, secondary phases and casting defects. Corrosion of AZ31 magnesium alloy in different states are mainly pitted.