Electrochemical surface engineering of magnesium metal by plasma electrolytic oxidation and calcium phosphate deposition: biocompatibility and in vitro degradation studies

被引：17
作者：
Kannan, M. Bobby [1 ,2 ]
Walter, R. [1 ]
Yamamoto, A. [2 ]
Khakbaz, H. [1 ]
Blawert, C. [3 ]
机构：
[1] James Cook Univ, Coll Sci & Engn, Biomat & Engn Mat BEM Lab, Townsville, Qld 4811, Australia
[2] Natl Inst Mat Sci NIMS, Res Ctr Funct Mat, Tsukuba, Ibaraki 3050044, Japan
[3] Zentrum Mat & Kustenforsch GmbH, Helmholtz Zentrum Geesthacht, Inst Mat Res, D-21502 Geesthacht, Germany
来源：
RSC ADVANCES | 2018年 / 8卷 / 51期
关键词：
MICRO-ARC OXIDATION; CORROSION BEHAVIOR; HYDROXYAPATITE COATINGS; MECHANICAL INTEGRITY; MG ALLOY; PEO; SILICATE; BIODEGRADATION; PERFORMANCE; IONS;
D O I：
10.1039/c8ra05278f
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
In this study, the surface of magnesium metal was electrochemically engineered for enhanced biocompatibility and controlled degradation in body fluid. Firstly, a plasma electrolytic oxidation (PEO) coating was formed on magnesium, followed by electrochemical deposition of calcium phosphate (CaP) using an unconventional electrolyte. Cytocompatibility tests using L929 cells revealed that the PEO-CaP coating significantly improved the biocompatibility of magnesium. In vitro electrochemical degradation experiments in simulated body fluid (SBF) showed that the PEO-CaP coating improved the degradation resistance of magnesium significantly. The corrosion current density (i(corr)) of the PEO-CaP coated magnesium was approximate to 99% and approximate to 97% lower than that of bare magnesium and the PEO-only coated magnesium, respectively. Similarly, electrochemical impedance spectroscopy (EIS) results showed that the polarisation resistance (R-P) of the PEO-CaP coated magnesium was one-order of magnitude higher as compared to the PEO-only coated magnesium and two-orders of magnitude higher than the bare magnesium, after 72 h immersion in SBF. Scanning electron microscopy (SEM) analysis revealed no localized degradation in the PEO-CaP coated magnesium. The study demonstrated that the PEO-CaP coating is a promising combination for enhancing the biocompatibility and reducing the degradation of magnesium for potential biodegradable implant applications.
引用
收藏
页码：29189 / 29200
页数：12
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