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Abstract
Biodegradable magnesium (Mg) alloys are known as "the new generation of biomedical metal materials". However, high degradation rates restrict their clinical application. To overcome this issue, a new and simple method for producing of protective coating based on hydrothermal synthesis at 200 °C in 0.5 M NaHCO3 was elaborated. The microstructure, elemental and phase composition of the produced films were examined by scanning electron microscope (SEM), X-ray energy-dispersive spectrometer (EDS) and X-ray diffraction (XRD). The mechanical strength of the protective coating was evaluated by grid scribing method. The corrosion protection effect was evaluated using linear sweep voltammogram (LSV) and electrochemical impedance spectroscopy (EIS) methods in the simulated body fluid (SBF). Since the corrosion process is accompanied by stoichiometric evolution of hydrogen, the amount of the latter was measured to quantify the overall corrosion rate. Both the coatings morphology and phase composition were sensitive to the treatment duration. The coating formed after 0.5 h was loose and mainly consisted of spherical flower-like Mg5(CO3)4(OH)2·4H2O accompanied by small amounts of Mg(OH)2. The treatment duration of 3 h resulted in a thicker compact coating composed mainly of irregular granular MgCO3 as well as Mg(OH)2. The coating providing the most effective protection and uniform corrosion was achieved by 2 h treatment at 200 °C.
Highlights
Mg alloys have attracted much attention for their potential use as a new class of biodegradable medical implant materials, as they possess good biocompatibility [1]
The morphology and phase composition of the coatings were examined by scanning electron microscope (SEM, Quanta 200 FEG, FEI, Hillsboro, OR, USA) equipped with X-ray energy-dispersive spectrometer (EDS, Quanta 200 FEG, FEI, Hillsboro, OR, USA) and X-ray diffraction (XRD, D/MAX-Ultima III, Rigaku Corporation, Tokyo, Japan)
Smaller spheres composed compactly aggregated layer, while larger spheres were scattered on the compact layer surface (Figure 1a–d)
Summary
Mg alloys have attracted much attention for their potential use as a new class of biodegradable medical implant materials, as they possess good biocompatibility [1]. Their degradation products can be excreted through human metabolism. Mg is an essential element for human organisms, which could have stimulatory effects on the bone grafting. The density and the elastic modulus of Mg alloys are close to those of natural bones [2]. Mg alloys are known as “the new generation of biomedical metal materials” [3]. The biological applications of Mg alloys are limited mainly due to their too rapid degradation rate for most implanted devices [4,5]
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