Structures and Properties of Al-Zn-Sn-Bi-Ti-B Alloy in Different Heat Treatment Conditions

The microstructures and electrochemical properties of Al-Zn-Sn-Bi-Ti-B alloy for anode in varied heat treatment conditions were investigated by means of electrochemistry measuring system.The results show that the current efficiency of the alloy after heat treating is lower than that of as-cast alloy,and that the current efficiency of the alloy solution-treated at 460℃is the greastest but 1.3%lower than that of the as-cast alloy.The grains are coarser and the second phases are less and disperse in the grains insofar as the alloy annealed or solution-treated. After being heat-treated,the self-corrosion potential of the alloy will deflect and the electrochemical performance will become worse,thus this alloy can be directly used without being heat-treated.