热轧对双相Mg-Li基合金电化学行为的影响  

Effect of Hot Rolling on Electrochemical Behavior of Duplex Mg-Li Alloy

作　　者：李起 王日初[1] 蔡志勇[1] 张纯[1] LI Qi;WANG Richu;CAI Zhiyong;ZHANG Chun(School of Materials Science and Engineering,Central South University,Changsha,Hunan 410083,China)

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《有色冶金设计与研究》2018年第4期19-22,共4页Nonferrous Metals Engineering & Research

基　　金：湖南省自然科学基金(No.2016JJ2147);湖南重点研发计划(2017 GK2261);深圳市科技计划项目(CXZZ 20140506150310438)

摘　　要：通过电化学测试方法,结合显微组织表征研究热轧对海水激活电池用Mg-3Al-8Li-1Zn-0.4Mn合金阳极电化学行为的影响。研究表明,热轧使合金的两相沿轧制方向呈条状分布,成分均匀,增强放电活性,促使放电电位负移,使其发生均匀的电化学溶解,提高小电流密度下的阳极利用率。热轧使合金中α-Mg边缘的元素富集现象消失,不利于抑制放电过程中的析氢副反应,导致大电流密度下的阳极利用率下降。The authors have studied the effects of hot rolling upon the electrochemical behavior of Mg-3 Al-8 Li-1 Zn-0.4 Mn alloy anode in batteries activated with seawater through electrochemical test methods and microstructuralcharacterization. The study shows that hot rolling makes the two phases of the alloy in strip distribution along the rolling direction with even components, which intensifies the discharge activity and enables negative shift of the discharge potential to generate uniformelectrochemical dissolution and increase the anode utilization rateat low current density. Moreover, hot rolling eliminates elementenrichmenton the edge of α-Mg in the alloy, which is not conducive to inhibiting the side reactionof hydrogen evolution in the process of discharge. Therefore, the anode utilization rate at high current density decreases.

关 键 词：热轧 电化学 放电活性 电位 阳极利用率 

分 类 号：TG335.11[金属学及工艺—金属压力加工]