Flow-induced corrosion of absorbable magnesium alloy: In-situ and real-time electrochemical study

• DOI: 10.1016/j.corsci.2015.12.020
• Publication Date: 2015-12-24T17:01:12Z
• Authors: Juan Wang; Yongseok Jang; Guojiang Wan; Venkataraman Giri...; Guang-Ling Song; Zhigang Xu; Youngmi Koo; Pengkai Qi; Jagannathan Sankar; Nan Huang; Yeoheung Yun
• Keywords: 13. Climate action; 02 engineering and technology; 0210 nano-technology; 6. Clean water

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.