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

doi:10.1007/s11706-014-0264-6

Front. Mater. Sci.

2014, Vol. 8

Issue (4) : 343-353 https://doi.org/10.1007/s11706-014-0264-6

RESEARCH ARTICLE

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

Rong-Chang ZENG^1,^2,^*(

),Wei-Chen QI^1,²,Ying-Wei SONG³,Qin-Kun HE¹,Hong-Zhi CUI¹,En-Hou HAN³

1. College of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China
2. 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
3. National Engineering Center for Corrosion Control, Institute of Metals Research, Chinese Academy of Sciences, Shenyang 110016, China

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Abstract

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 implants, resulting from the degradation, arouses 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 the pH variation in an appropriate range. Surface morphologies were discerned using SEM and EMPA. And corrosion resistance was evaluated via electrochemical polarization and impedance and hydrogen volumetric method. The results demonstrated that the MAO coating predominantly consisted of MgO, Mg₂SiO₄ and Y₂O₃. 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 neutralization caused by the alkalinity of MAO and Mg substrate and acidification of PLA was probed. The result designates that MAO/PLA composite coating on Mg--1.21Li--1.12Ca--1.0Y alloys may be a promising biomedical coating.

Keywords magnesium alloy micro-arc oxidation (MAO) poly(lactic acid) (PLA) biomaterial degradation

Corresponding Author(s): Rong-Chang ZENG

Online First Date: 24 October 2014 Issue Date: 04 December 2014

Cite this article:

Rong-Chang ZENG,Wei-Chen QI,Ying-Wei SONG, et al. In vitro degradation of MAO/PLA coating on Mg--1.21Li--1.12Ca--1.0Y alloy[J]. Front. Mater. Sci., 2014, 8(4): 343-353.

URL:

https://academic.hep.com.cn/foms/EN/10.1007/s11706-014-0264-6
https://academic.hep.com.cn/foms/EN/Y2014/V8/I4/343

Fig.1 SEM images of (a) MAO coating and (b) MAO/PLA coating on Mg–1.21Li–1.12Ca–1.0Y alloy.

Tab.1 Pore size of the coatings on Mg–1.21Li–1.12Ca–1.0Y alloy

Fig.2 SEM image of the MAO/PLA coating on cross-sectional view.

Fig.3 Elemental mapping of (a) the MAO coating on cross-section: (b) Mg; (c) Ca; (d) O; (e) Si; (f) P.

Fig.4 Polarization curves of the substrate and its coatings in Hank’s solution.

Fig.5 (a) Nyquist plots and (b) Bode plots of the substrate and its coatings in Hank’s solution.

Fig.6 Equivalent circuit of EIS: (a) the substrate and MAO/PLA composite coating; (b) the MAO coating in Hank’s solution.

Tab.2 Fitting results of EIS of the substrate and its coatings in Hank’s solution

Fig.7 HER of the substrate and its coatings in Hank’s solution.

Fig.8 Variation in pH values for the substrate and its coatings on the Mg–1.21Li–1.12Ca–1.0Y alloy and PLA coating on PTFE in Hank’s solution.

Fig.9 Schematic illustration of the corrosion mechanism of the MAO coating: (a) at the first stage; (b) at the second stage.

Fig.10 SEM images of MAO/PLA coating soaked in Hank’s solution for 72 h.

Fig.11 XRD patterns of MAO and MAO/PLA coatings after immersion in Hank’s solution for 72 h.

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