利用扫描电镜(SEM)、X射线衍射(XRD)等检测分析稀土元素La对Mg-6%Al-5%Pb(AP65)镁合金(质量分数)显微组织的影响,并采用恒电流法、动电位极化扫描法和析氢法研究La含量对AP65镁合金的腐蚀电化学性能的影响。结果表明:加入La能够使AP65...利用扫描电镜(SEM)、X射线衍射(XRD)等检测分析稀土元素La对Mg-6%Al-5%Pb(AP65)镁合金(质量分数)显微组织的影响,并采用恒电流法、动电位极化扫描法和析氢法研究La含量对AP65镁合金的腐蚀电化学性能的影响。结果表明:加入La能够使AP65镁合金α-Mg组织得到细化,生成针状稀土相Mg80(Al,La)17和块状稀土相Mg17(Al,La)12;添加La提高了AP65镁合金的电化学活性、耐腐蚀性能和阳极效率,使AP65的平均电位负移;当La含量为2%(质量分数)时,平均电位最负为-1.73 V(vs SCE)。添加6%La使AP65镁合金的平均析氢速率从1.75 m L/(cm2·h)下降到0.02 m L/(cm2·h),并且使阳极效率从74.30%上升到82.31%。展开更多
Aluminum is an innovative anode material for seawater battery. But large polarization and low electrochemical activity restrict its application. In this research, A1-Mg-Sn-Hg-Ce anode materials were prepared and the m...Aluminum is an innovative anode material for seawater battery. But large polarization and low electrochemical activity restrict its application. In this research, A1-Mg-Sn-Hg-Ce anode materials were prepared and the microstructures were investigated by scanning electron microscopy （SEM）. The electrochemical properties of A1-Mg-Sn-Hg-Ce anode materials were measured by potentiodynamic polarization and potential-time discharge in a 4.5 wt.%NaOH solution at 353 K. The results indicated that the increasing content of cerium addition refined the grain structure of A1-Mg-Sn-Hg alloy and promoted the uniform distribution of Sn and Hg elements in A1 matrix. The morphology of second phases changed from disperse granular to intergranulate strip with the increasing content of cerium addition in AI-Mg-Sn-Hg alloy. During the half-cell tests at a 650 mA/cm3 current density, the discharge activity of AI-Mg-Sn-Hg-Ce alloy was improved with the increasing content of cerium addition. The average discharge potential of AI-Mg-Sn-Hg-0.3 wt.%Ce alloy was -1.721 V （vs. SCE）, which was more negative than -1.406 V （vs. SCE） in AZglD. The best corrosion resistance occurred in A1-Mg-Sn-Hg-0.05 wt.%Ce alloy with the corrosion current density, 18.84± 2.21 mA/cm2. The corrosion behaviours of A1-Mg-Sn-Hg-Ce alloys were also analyzed.展开更多
文摘利用扫描电镜(SEM)、X射线衍射(XRD)等检测分析稀土元素La对Mg-6%Al-5%Pb(AP65)镁合金(质量分数)显微组织的影响,并采用恒电流法、动电位极化扫描法和析氢法研究La含量对AP65镁合金的腐蚀电化学性能的影响。结果表明:加入La能够使AP65镁合金α-Mg组织得到细化,生成针状稀土相Mg80(Al,La)17和块状稀土相Mg17(Al,La)12;添加La提高了AP65镁合金的电化学活性、耐腐蚀性能和阳极效率,使AP65的平均电位负移;当La含量为2%(质量分数)时,平均电位最负为-1.73 V(vs SCE)。添加6%La使AP65镁合金的平均析氢速率从1.75 m L/(cm2·h)下降到0.02 m L/(cm2·h),并且使阳极效率从74.30%上升到82.31%。
基金financial supports from the National Natural Science Foundation of China (No.51804349)the China Postdoctoral Science Foundation (No.2018M632986)+1 种基金the Natural Science Foundation of Hunan Province,China (No.2019JJ50766)the National Key Laboratory of Science and Technology on High-strength Structural Materials,China (No.JCKY201851)。
基金The authors are grateful for the financial supports from the National Natural Science Foundation of China(51804349)the China Postdoctoral Science Foundation(2018M632986)the Natural Science Foundation of Hunan Province,China(2019JJ50766).
基金supported by National Natural Science Foundation of China(51101171)the Specialized Research Fund for the Doctor Program of Higher Education(20110162120051)
文摘Aluminum is an innovative anode material for seawater battery. But large polarization and low electrochemical activity restrict its application. In this research, A1-Mg-Sn-Hg-Ce anode materials were prepared and the microstructures were investigated by scanning electron microscopy （SEM）. The electrochemical properties of A1-Mg-Sn-Hg-Ce anode materials were measured by potentiodynamic polarization and potential-time discharge in a 4.5 wt.%NaOH solution at 353 K. The results indicated that the increasing content of cerium addition refined the grain structure of A1-Mg-Sn-Hg alloy and promoted the uniform distribution of Sn and Hg elements in A1 matrix. The morphology of second phases changed from disperse granular to intergranulate strip with the increasing content of cerium addition in AI-Mg-Sn-Hg alloy. During the half-cell tests at a 650 mA/cm3 current density, the discharge activity of AI-Mg-Sn-Hg-Ce alloy was improved with the increasing content of cerium addition. The average discharge potential of AI-Mg-Sn-Hg-0.3 wt.%Ce alloy was -1.721 V （vs. SCE）, which was more negative than -1.406 V （vs. SCE） in AZglD. The best corrosion resistance occurred in A1-Mg-Sn-Hg-0.05 wt.%Ce alloy with the corrosion current density, 18.84± 2.21 mA/cm2. The corrosion behaviours of A1-Mg-Sn-Hg-Ce alloys were also analyzed.
