Zn-0.3Bi-0.06Ti合金的制备与电化学性能

实验室通过熔炼、轧制等制备无铅的Zn-0.3Bi-0.06Ti合金板带材,并测得其强度、硬度和拉伸性能。利用电化学工作站,通过计时电位法和线性电位扫描法研究Zn-0.3Bi-0.06Ti合金的电化学性能,借助金相显微镜、扫描电镜(SEM)、X射线衍射(XRD)等手段对合金微观组织进行观察和分析。结果发现:在传统制备工艺基础上采用水冷模铸造和轧制前加热工作辊的方法,能够解决无铅电池用锌合金轧制难的问题;通过电化学测试发现Zn-0.3Bi-0.06Ti合金表现出典型的钝化电化学性能,PVi(2 h)测试中合金电极电势在-1.35 V左右保持稳定,但出现明显的点蚀,腐蚀产物由ZnO、Zn(OH)2、Ti3O5和TiO2组成。

Electrochemical performance of Zn-0.3Bi-0.06Ti alloy

Lead-free Zn-0.3Bi-0.06Ti alloy plate was prepared through casting and rolling,also its hardness,strength and tensile properties were got in lab.The electrochemical performance of Zn-0.3Bi-0.06Ti alloy was studied by chronopotentiometry,and the polarization curve in the electrochemical workstation.Moreover,the microstructures of the alloy were observed and analyzed by metalloscope,SEM and XRD.The results show that the problem that lead-free zinc alloy is hard to roll can be solved using the water cooling mold casting and heating working rollers before rolling based on the traditional processing craft;Zn-0.3Bi-0.06Ti alloy displays the deactivated electrochemical performance in the electrochemistry test,and the electrode potential of the alloy maintains stable at-1.35 V in PVi(2 h) test,but the obvious pitting corrosion occurs,which is composed of ZnO,Zn(OH)2,Ti3O5 and TiO2.