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Mg-Al-Pb合金是一种应用于海水激活电池的镁阳极材料。为提高Mg-Al-Pb合金的电流效率,通过扫描电子显微镜和电化学测试方法研究Ce对Mg-Al-Pb合金显微组织和腐蚀电化学性能的影响。结果表明,Ce元素促进了条状第二相Al_(11)Ce_3的析出,使Mg_(17)Al_(12)相在Mg-Al-Pb-Ce合金中分布更均匀,并细化了合金的显微组织。Ce的添加提高了Mg-Al-Pb合金的放电活性,大量的第二相Al_(11)Ce_3和Mg_(17)Al_(12)使合金的微电偶腐蚀增强,从而导致Mg-Al-Pb-Ce合金具有较大的腐蚀电流密度和析氢速率。放电过程中Mg-Al-Pb合金存在晶粒脱落,相比之下,Mg-Al-Pb-Ce合金具有更大的电流效率。
Mg-Al-Pb alloy is a magnesium anode material used in seawater activated batteries. In order to improve the current efficiency of Mg-Al-Pb alloy, the effect of Ce on the microstructure and electrochemical corrosion of Mg-Al-Pb alloy was studied by scanning electron microscopy and electrochemical measurement. The results show that the Ce element promotes the precipitation of the second phase Al 11 Ce 3, and the Mg 17 Al 12 phase is more evenly distributed in the Mg-Al-Pb-Ce alloy and the grain size of the alloy Microstructure. The addition of Ce improves the discharge activity of the Mg-Al-Pb alloy, and a large amount of the second phase Al 11 Ce 3 and Mg 17 Al 12 increase the micro-galvanic corrosion of the alloy, -Ce alloy has a larger corrosion current density and hydrogen evolution rate. In the discharge process, Mg-Al-Pb alloy is exfoliated. In contrast, Mg-Al-Pb-Ce alloy has larger current efficiency.