Abstract
Paper presents study on the hydrothermal treatment for hydroxyapatite layer formation on the different biodegradable Mg-substrates. The evaluation of corrosion resistance in Ringer’s solution and contact angle measurements in glycerol were performed. Alloys and composites substrates obtained by mechanical alloying and powder metallurgy route are characterized by submicron range microstructure, which is responsible for further surface processing characteristic. Hydrothermal treatment in Ca-EDTA (ethylenediaminetetraacetic acid calcium disodium salt) led to formation of hydroxyapatite layers, which improves both the corrosion resistance and surface wetting properties compared to microcrystalline magnesium.
Highlights
Magnesium alloys and their composites strongly attract the international community of researchers because of their potential as temporary biodegradable implant materials, mostly appreciated for their physical and mechanical properties [1]
The performed research indicates that the analyzed alloys and their composite structures may offer more than just a high dispersion and homogeneous microstructure that allow controlling of the results of the hardness measurements
The proposed hydrothermal treatment (HT) procedure and its results obtained for the magnesium alloys and the composites that are based on them show an evident enhancement in the analyzed properties
Summary
Magnesium alloys and their composites strongly attract the international community of researchers because of their potential as temporary biodegradable implant materials, mostly appreciated for their physical and mechanical properties [1]. Hydroxyapatite (HAp) layers obtained by the hydrothermal treatment approach proposed in this work may offer high corrosion resistance and no environmental toxicity They are characterized with a high thermodynamic, structural stability, and, most importantly, basic components that are the same as human bone. The zirconium containing the magnesium alloys, besides improving the mechanical properties, usually has a higher corrosion resistance compared to the Zr-free magnesium materials [16] Other elements such as silver, for example, could be considered as antibacterial surface agents [17], widely investigated in titanium-based composite systems [18]. Different surface modification treatments could be proposed, attractive for their possible improvements of the corrosion resistance and biocompatibility of the magnesium-based materials [23,24]. The proposed conceptualization leads to a broader scope in the direct enhancement of the properties of biodegradable Mg-materials and, most importantly, at the same time allows an analysis of the influence of different factors simultaneously (the influence of composition or surface condition on the corrosion resistance and contact angles measurements)
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