轧制温度对AZ61合金组织和电极性能的影响  

Effect of rolling temperature on microstructure and electrode properties of AZ61 alloy

作　　者：王军朋 邹金超 黄志权[1] 张涛[1] WANG Junpeng;ZOU Jinchao;HUANG Zhiquan;ZHANG Tao(School of Mechanical Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China)

机构地区：[1]太原科技大学机械工程学院,太原030024

出　　处：《材料科学与工艺》2022年第4期42-48,共7页Materials Science and Technology

基　　金：国家自然科学基金资助项目(52075357);国家重点研发计划项目(2018YFA0707301);山西省研究生教育创新项目(2021Y687;2021Y672)。

摘　　要：为了探讨轧制温度对AZ61镁合金板材微观组织的影响,以及对电化学性能和放电性能的遗传效应,本文利用X射线衍射仪、光学显微镜和扫描电子显微镜对AZ61镁合金的微观组织结构和放电形貌进行了表征,采用极化曲线和组装镁空气电池放电方法对AZ61镁合金的电化学及放电性能进行了测试。研究表明:在300~400℃范围内,随着轧制温度的升高,AZ61镁合金的腐蚀电位先正移后负移再正移,腐蚀电流密度先减小后增大再减小。在350℃下轧制的AZ61镁合金具有最优良的耐腐蚀性能,其腐蚀电位为-1.470 V,腐蚀电流为8.415×10^(-6)A/cm^(2)。在电流密度为10^(-6) mA/cm^(2)条件下,轧制温度为350℃的AZ61镁合金的放电效率和比容量均达到峰值,分别为55.97%和1 253.13 mAh/g,且其放电形貌较为光滑并伴随少量凹坑。轧制温度可以有效细化合金的微观组织结构,减少β相的含量,有利于该合金耐腐蚀性的提高和放电参数的增大。To investigate the effect of rolling temperature on the microstructure of AZ61 magnesium alloy sheet and the genetic effect on electrochemical properties and discharge properties, the microstructure and discharge morphology of AZ61 alloy were characterized by X-ray diffractometer(XRD), optical microscope(OM), and scanning electron microscope(SEM). The electrochemical and discharge properties of the alloy were tested by polarization curve and assembled magnesium air cell discharge method. Results show that in the range of 300~400 ℃, with the increase in rolling temperature, the corrosion potential of AZ61 magnesium alloy first shifted towards positive direction then negative and finally positive, while the corrosion current density first decreased then increased and decreased again. The AZ61 magnesium alloy rolled at 350 ℃ had the best corrosion resistance, with a corrosion potential of-1.470 V and a corrosion current of 8.415×10^(-6)A/cm^(2).In addition, at current density of 10^(-6) mA/cm^(2), the discharge efficiency and specific capacity of AZ61 alloy at rolling temperature of 350 ℃ reached peak values of 55.97% and 1 253.13 mAh/g respectively, and the discharge morphology was relatively smooth with a few pits.The rolling temperature can effectively refine the microstructure of the alloy and reduce the content of β phase, which is beneficial to improve the corrosion resistance of the alloy and increase the discharge parameters.

关 键 词：AZ61阳极材料 轧制温度 微观组织 腐蚀性能 放电性能 

分 类 号：TG146[一般工业技术—材料科学与工程]