Research On The Microstructure And Corrosion Electrochemical Behavior Of AP65Alloy

AP65magnesium alloy anode material, which has the properties of high discharge activity and high anode utilization rate, is a kind of high power seawater battery anode material with excellent performance.In this paper, AP65alloys were prepared by melting and casting and investigated in seawater using electrochemical techniques and microstructure characterizations based on Al-x%Mn(x=15,30and50) master alloys, preparation process and trace zinc element. Conclusions are as follows:1) The influence of the Al-x%Mn(x=15,30and50) master alloys on microstructure and properties of the AP65alloys is studied. The results show that AP65alloy with the addition of Al-50%Mn master alloy provides electrochemical activity,the most negative corrosion average potential-1.66V. Al11Mn4compounds was present in the as-cast AP65magnesium alloy with the addition of Al-50%Mn master alloy,whose negative average potential and low average corrosion rate are-1.660V (vs SCE) and31.030mm/a, respectively. Thus, it has good electrochemical activity.2) The effect of alloying elements zinc on the the microstructure and the performance of as-cast AP65alloy is investigated. The results indicate that smaller grain size, the lowest average average potential (-1.756V(vs SCE)) and the lowest hydrogen production rate (9.363mm/a) all occurred, when the content of Zn is1.2%.3) The effect of preparation process on the microstructure and discharge behavior of AP65alloy is studied. The results show that after solid-treated400℃for24h, isometric crystal grain structure is found in AP65alloy, and most β-Mg17Al12phase dissolves in magnesium matrix. Rolling can refine the grain and enhances electrochemical performance of AP65alloys. When the amount of deformation is88%, as-rolled AP65alloy got the lowest average discharge potential (-1.78V (vs SCE)) and the average hydrogen production rate (33.436mm/a). When rolled AP65alloy was annealed at200℃～400℃, the grain size of AP65alloy increases with the annealing temperature and the annealing time enhancing. The average average potential decreases at first and then turns to be increased. annealed for60mins at300℃, the average potential of AP65alloy is the lowest(-1.790V (vs SCE)), whose average hydrogen production rate is the lowest as well(22.891mm/a).