Mg-Al-Pb alloy is one of the newly developed materials for the seawater activated batteries. As-cast Mg-6Al-5Pb and Mg-6Al-5Pb-0.5Mn alloys with different additions of Al-15%Mn （mass fraction）, Al-30%Mn and Al-50%Mn...Mg-Al-Pb alloy is one of the newly developed materials for the seawater activated batteries. As-cast Mg-6Al-5Pb and Mg-6Al-5Pb-0.5Mn alloys with different additions of Al-15%Mn （mass fraction）, Al-30%Mn and Al-50%Mn master alloys were prepared by melting and casting. Their microstructures were observed by optical microscopy and scanning electron microscopy. The electrochemical properties, hydrogen evolution and mass loss of Mg-6Al-5Pb-0.5Mn alloys were studied. The results show that Mg-6Al-5Pb-0.5Mn alloy added with Al-50%Mn master alloy provides more negative corrosion average potential （-1.66 V）, smaller corrosion current density （7 μm/cm2） and lower free corrosion rate （0.51 mg·cm-2·h-1） than other alloys. This is probably attributed to the presence of Al11Mn4 phase, which facilitates the self-peeling of corrosion products and enlarges the electrochemical reaction area as well as enhances the electrochemical activity.展开更多
基金Project(JPPT-115-168)supported by the National Key Science and Technological Project of ChinaProject(51101171)supported by the National Natural Science Foundation of China
文摘Mg-Al-Pb alloy is one of the newly developed materials for the seawater activated batteries. As-cast Mg-6Al-5Pb and Mg-6Al-5Pb-0.5Mn alloys with different additions of Al-15%Mn （mass fraction）, Al-30%Mn and Al-50%Mn master alloys were prepared by melting and casting. Their microstructures were observed by optical microscopy and scanning electron microscopy. The electrochemical properties, hydrogen evolution and mass loss of Mg-6Al-5Pb-0.5Mn alloys were studied. The results show that Mg-6Al-5Pb-0.5Mn alloy added with Al-50%Mn master alloy provides more negative corrosion average potential （-1.66 V）, smaller corrosion current density （7 μm/cm2） and lower free corrosion rate （0.51 mg·cm-2·h-1） than other alloys. This is probably attributed to the presence of Al11Mn4 phase, which facilitates the self-peeling of corrosion products and enlarges the electrochemical reaction area as well as enhances the electrochemical activity.
文摘利用AlCl3+LiAlH4+MnCl2有机溶剂体系在低碳钢基体上进行了电镀Al-Mn合金的实验,并对不同电镀工艺下Al-Mn合金镀层的表面形貌、成分、结构、厚度、结合力和耐蚀性等进行了研究.实验结果表明,沉积出的Al-Mn合金镀层表面光滑并呈网状分布;镀层中的Mn含量(原子分数)在30/0-80/0间变化,其中Mn以Al-Mn过饱和固溶体形式存在,且按(200)面的结构进行生长.随电镀时间和电流密度的增加,Al-Mn合金镀层的厚度呈线性增大,但膜层与基体的结合力逐渐降低.Al-Mn合金镀层的耐蚀性随沉积电流密度的增加而减小,随电镀时间的延长呈先增大后减小的规律.Al-Mn合金镀层的沉积速率、结合力和耐蚀性均高于相同沉积条件下的纯铝镀层。Al-Mn合金镀层在AlCl3+LiAlH4+MnCl2有机溶剂体系中的最佳沉积工艺为电流密度0.15-0.50 A/dm2、电镀时间30-45 min.
