Dynamic corrosion behavior of AZ80 magnesium alloy with different orientations in simulated body fluid
Dynamic corrosion behavior of AZ80 magnesium alloy with different orientations in simulated body fluid
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不同取向AZ80镁合金在模拟体液中的动态腐蚀行为
DOI：
10.1016/j.matchemphys.2020.124039
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发表时间：
2021-02
影响因子：
4.6
通讯作者：
Xiong Ying
中科院分区：
文献类型：
--
作者：
Zhu Tao;Yu Yi;Yang Jie;Shen Yongshui;He Liuyong;Xiong Ying
分别沿AZ80镁合金轧材的法线方向（ND）和横向（TD）方向制备两个试样，另一个试样沿45°法线方向（ND45）制备。将三个样品（ND、ND45 和 TD）浸入动态浸没设备中进行原位电化学测试。利用电化学阻抗谱（EIS）、扫描电子显微镜（SEM）和能量色散谱（EDS）研究了试样在模拟体液（SBF）中的静态和动态腐蚀行为。结果表明，不同取向的试样表现出腐蚀性能的各向异性。样品的电化学耐腐蚀性能按以下顺序降低：TD>ND45>ND。样品的电化学耐腐蚀性随着流量的增加而降低。浸泡在SBF溶液中的试件发生局部腐蚀，动态环境下试件边缘位置的腐蚀程度高于中间位置。计算流体动力学（CFD）模拟表明，随着流量的增加，剪切应力和传质系数增加导致局部腐蚀加剧。讨论了初始织构和流量对镁合金腐蚀行为的影响。
Two specimens were prepared along the normal (ND) and transverse (TD) directions of the AZ80 magnesium alloy rolled sheet, respectively, and the other specimen was prepared along the normal direction at 45° (ND45). Three specimens (ND, ND45 and TD) were immersed in dynamic immersion equipment for in-situ electrochemical test. Electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) were used to investigate the static and dynamic corrosion behavior of the specimens in simulated body fluid (SBF). The results indicated that the specimens with different orientations exhibited anisotropy of corrosion performance. The electrochemical corrosion resistance of the specimens decreased in the following order: TD > ND45 > ND. The electrochemical corrosion resistance of the specimens decreased with increasing flow rate. The specimens immersed in SBF solution suffered localized corrosion, and the corrosion degree at the edge position of the specimen was higher than that at the middle position in dynamic environment. Computational fluid dynamics (CFD) simulations showed that with the increase of flow rate, the increase of shear stress and mass transfer coefficient led to the intensification of localized corrosion. The effect of initial texture and flow rate on the corrosion behavior of magnesium alloy was discussed.
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