In vitro degradation of MAO/PLA coating on Mg-1.21Li-1.12Ca-1.0Y alloy

作     者：Rong-Chang ZENG Wei-Chen QI Ying-Wei SONG Qin-Kun HE Hong-Zhi CUI En-Hou HAN 

作者机构：College of Materials Science and Engineering Shandong University of Science and Technology Qingdao 266590 China State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and Technology Qingdao 266590 China National Engineering Center for Corrosion Control Institute of Metals Research Chinese Academy of Sciences Shenyang 110016 China 

出 版 物：《Frontiers of Materials Science》 (材料学前沿（英文版）)

年 卷 期：2014年第8卷第4期

页      面：343-353页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：This research was financially supported by the National Natural Science Foundation of China (Grant No. 51241001)  Shandong Provincial Natural Science Foundation  China (ZR2011E MM004)  SDUST Research Fund (2014TDJH 104)  Joint innovative Center for Safe and Effective Mining Technology and Equipment of Coal Resources  and Shandong Province as well as Taishan Scholarship Project of Shandong Province (TS20110828). Thanks go to Prof. Rong-Shi Chen and the members of his group at Institute of Metals Research  Chinese Academy of Sciences for the preparation of the ingots 

主　　题：magnesium alloy micro.arc oxidation (MAO) poly(lactic acid)(PLA) biomaterial degradation 

摘      要：Magnesium and its alloys are promising biomaterials due to their biocompatibility and osteoinduction. The plasticity and corrosion resistance of commercial magnesium alloys cannot meet the requirements for degradable biomaterials completely at present. Particularly, the alkalinity in the microenvironment surrounding the degradation, implants, resulting from the arises a major concern. Micro arc oxidation （MAO） and poly（lactic acid） （PLA） composite （MAO/PLA）coating on biomedical Mg- 1.21Li-1.12Ca-1.0Y alloy was prepared to manipulate pH variation in an appropriate range. Surface morphologies were discerned using SEM EMPA. AM corrosion resistance was evaluated via electrochemical Polarization and impedance and hydrogen volumetric method. The results demonstrated that the MAO coating predomlnantly consisted of MgO, Mg2SiO4 and YzO3. The composite coating markedly improved the corrosion resistance of the alloy. The rise in solution pH for the MAO/PLA coating was tailored to a favorable range of 7.5-7.8 The neutrallzation caused by the alkalinity of MAO and Mg substrate and acidification of PLA was probed. The reSult designates that MAOI PLA composite coating on Mg-1.21Li-1.12Ca-1.0Y alloys may be a promising biomedical coating.