Influence of differential thermal-ECAP on microstructure and corrosion properties of TZK magnesium alloy
The influence of differential thermal-equal channel angular pressing(DT-ECAP)on the microstructure and corrosion proper-ties of Mg-5Sn-2Zn-0.5Zr(TZK)magnesium alloy was explored using optical microscopy(OM),scanning electron microscopy(SEM),electrochemistry,X-ray photoelectron spectroscopy(XPS)and other testing techniques.The results show that when the die temperature is 300℃and the sample is kept at room temperature(DT-1),the grains and the second phase of TZK magnesium alloy are significantly refined,and the second phase is diffusely distributed.In addition,under the DT-1 deformation condition,TZK magnesium alloy shows u-niform corrosion in Hank's solution,with corrosion rate of 1.161 mm·a-1,the corrosion potential and corrosion current density are-1.38 V and 5.916×10-6 mA·cm-2,respectively,and the corrosion resistance of the alloy is the best.When the die temperature is 300℃,the sample temperature is 200℃(DT-2)and the die is kept at room temperature,the sample temperature is 300℃(DT-3),the second phase is distributed in band shape along the deformation direction,and there is the coarse massive second phase in the local ar-ea,its corrosion in Hank's solution is mainly local corrosion.
NETL
NSTL
万方数据
