Journal
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
Volume 24, Issue 2, Pages 423-430Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S1003-6326(14)63078-8
Keywords
Al-Mn; master alloy; Mg-Al-Pb-Mn; hydrogen evolution; corrosion; seawater activated batteries
Categories
Funding
- National Key Science and Technological Project of China [JPPT-115-168]
- National Natural Science Foundation of China [51101171]
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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 mu m/cm(2)) 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.
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