热处理对镁合金负极材料组织和性能的影响  

Effects of heat treatment on microstructure and electrochemistry properties of magnesium alloy negative materials

作　　者：邓姝皓[1] 易丹青[1] 兰博[1] 周伶玲[1] 冀成年[1] 赵丽红[1] 

机构地区：[1]中南大学材料科学与工程学院有色金属材料科学与工程教育部重点实验室,湖南长沙410083

出　　处：《电源技术》2008年第8期508-511,共4页Chinese Journal of Power Sources

摘　　要：采用金相观察、X衍射(XRD)、扫描电镜(SEM)、结合能谱(EDS)研究了分级退火工艺对镁合金显微组织、相结构、表面形貌及成分分布的影响;采用化学浸泡和电化学方法研究了该镁合金在质量分数为3.5%NaCl溶液中腐蚀行为和电化学性能。结果表明,热处理可以改变镁合金的组织结构和成分分布,进而影响镁合金的电极电位和自腐蚀速度,经350℃分级退火工艺得到的镁合金晶粒尺寸均匀细致、成分分布均匀,在晶界形成Mg2Sn、Mg2Pb和Ga2Mg5网状的疏松多孔相,使镁合金负极的工作电极电位负而且稳定,自腐蚀速度很低且腐蚀产物更易于剥离从而促进电池反应深入进行。Morphologies, microstructure and composition distribution of the magnesium were studied by metallographic microscopy, x-ray diffraction （XRD）, scanning electron microscope （SEM） and energy dispersive spectroscopy （EDS）. The corrosion behavior and electrochemical properties of Mg alloy were also investigated by chemical and electrochemical methods by dipping in 3.5% NaCl solution. The results show that heat treatment process plays an important role in the influence on the microstructure, composition distribution, electrode potential and corrosion rate of the magnesium alloy. Comparing to other annealing temperature sample, the annealing one at 350 ℃ has smaller recrystallization size, homogeneous composition, and reticular tissue in grain boundary that consisted of Mg2Pb, Mg2Sn and Ga2Mg5. It leads to more negative and stable electrode potential, lower corrosion rate, easier to peel off of corrosion output.

关 键 词：镁合金 热处理 组织 性能 

分 类 号：TM911[电气工程—电力电子与电力传动]