Non-destructive corrosion study on a magnesium alloy with mechanical properties tailored for biodegradable cardiovascular stent applications
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2021年第7期
论文作者：Changhong Cai Marta M.Alves Renbo Song Yongjin Wang Jingyuan Li M.Fátima Montemor
文章页码：128 - 138
摘 要：AnMg-2Zn-0.6Zr-0.6Nd alloy for biodegradable cardiovascular stent applications was prepared through indirect extrusion. The alloy exhibited a superior combination of tensile yield strength（TYS）, ultimate tensile strength（UTS） and elongation（EL） of about 269 MPa, 298 MPa and 25.6 %, respectively. In addition,the non-destructive electrochemical frequency modulation（EFM） technique was used for the first time to investigate the corrosion behavior of Mg alloys combined with electrochemical impedance spectroscopy（EIS） in Dulbecco’s Modified Eagle’s Medium（DMEM） and in Hank’s solution. Compared with the corrosion rate of 0.07 mm/year in Hank’s solution, lower corrosion rate of 0.03 mm/year was achieved in DMEM. The significant differences between the corrosion rate trends were discussed and related with the composition of the corrosion layer formed. Depending on the biomimetic fluids tested, different corrosion products were precipitated on the alloy’s surface: a compact and homogeneous layer of MgxCay（PO4）z and Zn（OH）2 and organic compounds was formed in DMEM, whereas a partial coverage of MgxCay（PO4）z and Mg（OH）2 was formed in Hank’s solution.
Changhong Cai1,2，Marta M.Alves2，Renbo Song1，Yongjin Wang1，Jingyuan Li1，M.Fátima Montemor2
1. School of Materials Science and Engineering, University of Science and Technology Beijing2. Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa
摘 要：AnMg-2Zn-0.6Zr-0.6Nd alloy for biodegradable cardiovascular stent applications was prepared through indirect extrusion. The alloy exhibited a superior combination of tensile yield strength（TYS）, ultimate tensile strength（UTS） and elongation（EL） of about 269 MPa, 298 MPa and 25.6 %, respectively. In addition,the non-destructive electrochemical frequency modulation（EFM） technique was used for the first time to investigate the corrosion behavior of Mg alloys combined with electrochemical impedance spectroscopy（EIS） in Dulbecco’s Modified Eagle’s Medium（DMEM） and in Hank’s solution. Compared with the corrosion rate of 0.07 mm/year in Hank’s solution, lower corrosion rate of 0.03 mm/year was achieved in DMEM. The significant differences between the corrosion rate trends were discussed and related with the composition of the corrosion layer formed. Depending on the biomimetic fluids tested, different corrosion products were precipitated on the alloy’s surface: a compact and homogeneous layer of MgxCay（PO4）z and Zn（OH）2 and organic compounds was formed in DMEM, whereas a partial coverage of MgxCay（PO4）z and Mg（OH）2 was formed in Hank’s solution.
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