可吸收镁合金的流动诱导腐蚀：原位实时电化学研究
Flow-induced corrosion of absorbable magnesium alloy: In-situ and real-time electrochemical study.
作者信息
Wang Juan, Jang Yongseok, Wan Guojiang, Giridharan Venkataraman, Song Guang-Ling, Xu Zhigang, Koo Youngmi, Qi Pengkai, Sankar Jagannathan, Huang Nan, Yun Yeoheung
机构信息
NSF Engineering Research Center for Revolutionizing Metallic Biomaterials, North Carolina A & T State University, Greensboro, NC 27411, USA.
Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, PR China.
出版信息
Corros Sci. 2016 Mar;104:277-289. doi: 10.1016/j.corsci.2015.12.020. Epub 2015 Dec 24.
Abstract
An in-situ and real-time electrochemical study in a vascular bioreactor was designed to analyze corrosion mechanism of magnesium alloy (MgZnCa) under mimetic hydrodynamic conditions. Effect of hydrodynamics on corrosion kinetics, types, rates and products was analyzed. Flow-induced shear stress (FISS) accelerated mass and electron transfer, leading to an increase in uniform and localized corrosions. FISS increased the thickness of uniform corrosion layer, but filiform corrosion decreased this layer resistance at high FISS conditions. FISS also increased the removal rate of localized corrosion products. Impedance-estimated and linear polarization-measured polarization resistances provided a consistent correlation to corrosion rate calculated by computed tomography.
摘要
设计了一项在血管生物反应器中进行的原位实时电化学研究，以分析镁合金（MgZnCa）在模拟流体动力学条件下的腐蚀机制。分析了流体动力学对腐蚀动力学、类型、速率和产物的影响。流动诱导剪切应力（FISS）加速了质量和电子转移，导致均匀腐蚀和局部腐蚀增加。FISS增加了均匀腐蚀层的厚度，但在高FISS条件下丝状腐蚀降低了该层电阻。FISS还提高了局部腐蚀产物的去除率。通过阻抗估计和线性极化测量得到的极化电阻与通过计算机断层扫描计算得到的腐蚀速率具有一致的相关性。
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