Research on the corrosion properties of the bioresorbable magnesium alloy MA14 subjected to ECAP-Conform

Abstract

The current task in the field of medical materials science is the creation of materials suitable forthe fabrication of bioresorbable implants. The prospect of such applications is justified by thehigh biocompatibility of magnesium with living tissues and physiological environments, as wellas its ability to gradually dissolve during the bone fusion process, releasing non-toxic corrosionproducts. However, magnesium and its alloys are characterized by low mechanical and corrosionproperties, limiting their widespread use as implant materials. One possible way to overcome thisproblem is through thermomechanical processing using the principles of severe plastic deformation.The crucial factor in implementing this approach is the processing technology. In this study, theinfluence of technological parameters of the Equal Channel Angular Pressing by Conform scheme(ECAP-Conform) on the corrosion properties of magnesium alloy MA14 was analyzed. During theresearch, experiments were conducted on the ECAP-Conform setup with variations in the number ofcycles and processing temperature. The results of gravimetric corrosion tests showed that 4 cyclesof ECAP-Conform (mode 2) with a stepwise reduction in the deformation processing temperaturefrom 400 to 250 °C contribute to the formation of the most corrosion-resistant (among the testedmodes) structural state with an average grain size of 9±2 μm in a physiological Ringer's solutionenvironment.