Non-destructive corrosion study on a magnesium alloy with mechanical properties tailored for biodegradable cardiovascular stent applications  

作　　者：Changhong Cai Marta M.Alves Renbo Song Yongjin Wang Jingyuan Li 

机构地区：[1]School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing,100083,China [2]Centro de Qufmica Estrutural,Instituto Superior Tecnico,Universidade de Lisboa,Av.Rovisco Pais,1049-001,Lisboa,Portugal

出　　处：《Journal of Materials Science & Technology》2021年第7期128-138,共11页材料科学技术（英文版）

基　　金：supported by the National Key Research and Development Program of China (Grant No. 2016YFB0700300);the support from the China Scholarship Council (CSC, Grant No. 201906460053);the financial support of FundaÇão para a Ciência e Tecnologia (Grant No. UIDB/00100/2020)。

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 Mg_(x)Ca_(y)(PO_(4))_(z) and Zn(OH)_(2) and organic compounds was formed in DMEM, whereas a partial coverage of Mg_(x)Ca_(y)(PO_(4))_(z) and Zn(OH)_(2) was formed in Hank’s solution.

关 键 词：Mg-Zn-Zr-Nd alloy Mechanical property CORROSION EIS EFM 

分 类 号：R318.08[医药卫生—生物医学工程] TG146.22[医药卫生—基础医学]