Biocorrosion resistance and biocompatibility of Mg-AI layered double hydroxide/poly(L-lactic acid) hybrid coating on magnesium alloy AZ31  

作　　者：Xiang SUN Qing-Song YAO Yu-Chao LI Fen ZHANG Rong-Chang ZENG Yu-Hong ZOU Shuo-Qi LI 

机构地区：[1]Corrosion Laboratory ftor Light Metals,College of Materials Science and Engineering,Shandong University of Science and Technology,Qingdao 266590,China [2]School of Materials Science and Engineering,Liaocheng University,Liaocheng 252059,China [3]School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450002,China [4]College of Chemical and Environmental Engineering,Shandong University of Science and Technology,Qingdao 266590,China

出　　处：《Frontiers of Materials Science》2020年第4期426-441,共16页材料学前沿（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.51601108 and 51571134);the SDUST Research Fund(Grant No.2014TDJH104);the Natural Science Foundation of Shandong Province(ZR2019MB053).

摘　　要：A Mg-AI layered double hydroxide(Mg-AI-LDH)coating was firstly synthesized via an in-situ steam coating growth method on the AZ31 Mg alloy,and then was modified with poly(L-lactic acid)(PLLA)via dipping and vacuum freeze-drying.The microstructure and composition of LDH/PLLA hybrid coating were analyzed by XRD,SEM,EDS and FT-IR.The biocorrosion behavior of hybrid coating was evaluated by potentiodynamic polarization,electrochemical impedance spectroscopy(EIS)and hydrogen evolution test in the Hank's solution.The results showed that LDH/PLLA coatings exhibited a much dense layer compared to the unmodified Mg-AI-LDH coating with unobvious boundary between PLLA and LDH coatings.The corrosion current density of the LDH/PLLA-10 hybrid coating decreased three orders of magnitude in comparison to its substrate.It was proven that the existence of the PLLA coating further prolonged the service life of the Mg-AI-LDH coating.What's more,the MTT assay and livel dead staining showed that the LDH/PLL A-10 coating had good biocompatibility for Mouse NIH3T3 fibroblasts.The formation mechanism and the anti-corrosion mechanism of hybrid coatings were proposed.

关 键 词：magnesium alloy layered double hydroxide poly(L-lactic acid) corrosion resistance biocompatbility 

分 类 号：TG146.22[一般工业技术—材料科学与工程]