Abstract
This work studied the effect of alloying Mn by selective laser melting on the microstructure and biodegradation properties of pure Mg. The grains in the microstructure were quasi-polygon in shape. The average grain size was similar (~10 μm) for the SLMed Mg-xMn with different Mn contents. The XPS spectra of the corrosion surface showed that alloying Mn into Mg by SLM produced a relatively protective manganese oxide film, which contributed to decreasing the biodegradation rate. All the results of the electrochemistry test, immersion test and the corrosion surface morphologies coincided well. The SLMed Mg-0.8Mn had the lowest biodegradation rate. When Mn content was more than 0.8 wt.%, the influence of the undissolved Mn phase on the decrease of the biodegradation resistance counteracted the influence of the relatively protective manganese oxide layer on the increase of the biodegradation resistance.
Highlights
In recent years, Mg alloys are attracting much attention as novel biodegradable metallic implant materials in orthopedical and cardiovascular applications, due to their compatible density and elastic modulus to those of human natural bone and good biocompatibility [1,2,3]
Alloying Mn into Mg may provide an alloy with good prospects for biomedical applications, when the degradation and the toxicity is taken into consideration
The Mg-xMn alloys were fabricated by a self-regulated selective laser melting (SLM) system [9,15] as shown in Figure 1a, which consisted of a fiber laser, three-dimensional motion platform, a working platform, an argon gas protection system, and a computer control system
Summary
Mg alloys are attracting much attention as novel biodegradable metallic implant materials in orthopedical and cardiovascular applications, due to their compatible density and elastic modulus to those of human natural bone and good biocompatibility [1,2,3]. Their inherently rapid corrosion rate restricts their wider medical application, which causes loss of mechanical integrity and inadequate service performance [4].
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