轧制方式对镁合金生体腐蚀行为的影响

发布时间：2019-04-19 15:22

【摘要】：采用光学显微镜、扫描电镜、浸泡质量损失和拉伸测试等手段研究了轧制方式(常规轧制和一道次高应变速率轧制)对镁合金(纯镁,Mg-4Zn,Mg-4Zn-0.3Ca和ZK60)在Hank’s溶液中腐蚀行为的影响.结果表明:与常规轧制态相比,高应变速率轧制态镁合金在长时间浸泡过程中平均腐蚀速率较低,抗拉强度下降幅度较小,耐腐蚀性能明显提高,可归因于晶粒细化、再结晶程度较高、孪晶较少和残余第二相相对粗大等;轧制态合金中第二相较少且较细小,表现为相对均匀的丝状腐蚀.
[Abstract]:By means of optical microscope, scanning electron microscope, immersion mass loss and tensile test, the effects of rolling mode (conventional rolling and one pass of high strain rate rolling) on magnesium alloys (pure magnesium, Mg-4Zn,) were studied. The effect of Mg-4Zn-0.3Ca and ZK60 on corrosion behavior in Hank's solution. The results show that the average corrosion rate, tensile strength decrease and corrosion resistance of high strain rate rolled magnesium alloy are lower, and the corrosion resistance is improved obviously, which can be attributed to grain refinement, compared with the conventional rolling process, the average corrosion rate of high strain rate rolled magnesium alloy during long time immersion is lower than that of conventional rolling process. The recrystallization degree is higher, the twinning is less and the residual second phase is relatively coarse and so on. In the rolled alloy, the second phase is smaller and smaller, showing relatively uniform filamentary corrosion.
【作者单位】：湖南大学材料科学与工程学院;湖南省喷射沉积技术及应用重点实验室;
【基金】：国家自然科学基金资助项目(51571089) 湖南大学青年教师成长计划资助项目(531107021095) 国家级SIT创新实验项目(201410532001)~~
【分类号】：TG339;TG146.22

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