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TY - JOUR
TI - Biocorrosion resistance and biocompatibility of Mg-Al layered double hydroxide/poly(L-lactic acid) hybrid coating on magnesium alloy AZ31
AU - Sun, Xiang
AU - Yao, Qing-Song
AU - Li, Yu-Chao
AU - Zhang, Fen
AU - Zeng, Rong-Chang
AU - Zou, Yu-Hong
AU - Li, Shuo-Qi
T2 - Frontiers of Materials Science
AB - A Mg-Al layered double hydroxide (Mg-Al-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-Al-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-Al-LDH coating. What’s more, the MTT assay and live/dead staining showed that the LDH/PLLA-10 coating had good biocompatibility for Mouse NIH3T3 fibroblasts. The formation mechanism and the anti-corrosion mechanism of hybrid coatings were proposed.
DA - 2020/09/29/
PY - 2020
DO - 10.1007/s11706-020-0522-8
DP - Springer Link
J2 - Front. Mater. Sci.
LA - en
SN - 2095-0268
UR - https://doi.org/10.1007/s11706-020-0522-8
Y2 - 2020/10/05/07:27:13
ER -