Abstract
Magnesium-based alloys presented great potential for biodegradable implant materials. However, the poor mechanical properties and high corrosion rate blocked its extensive application. In this study, a new biodegradable Mg–Zn–Y–Gd–Zr alloy was fabricated and extruded. The microstructure, corrosion morphologies and corrosion products film of the as-cast, homogenized and as-extruded alloys were characterized by optical micrographs, scanning electron microscopy, X-ray diffraction and laser scanning confocal microscopy. Moreover, the corrosion mechanisms of the as-cast and as-extruded alloys were proposed, and the influencing factors of corrosion properties were discussed. The electrochemical test, immersion tests and corrosion morphologies demonstrated that the as-extruded alloy exhibited favorable corrosion properties. The as-cast and homogenized alloys displayed localized corrosion mode, and the as-extruded alloy displayed uniform corrosion mode. The Volta potential of the Mg3(Y,Gd)2Zn3 phase relative to Mg matrix was measured by using Kelvin probe force microscopy.
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This research was supported by the financial support of the National Key Research and Development Program of China (2018YFB0704102).
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Xu, Y., Li, J., Qi, M. et al. Effect of extrusion on the microstructure and corrosion behaviors of biodegradable Mg–Zn–Y–Gd–Zr alloy. J Mater Sci 55, 1231–1245 (2020). https://doi.org/10.1007/s10853-019-03978-8
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DOI: https://doi.org/10.1007/s10853-019-03978-8