期刊
ACS BIOMATERIALS SCIENCE & ENGINEERING
卷 9, 期 5, 页码 2376-2391出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsbiomaterials.2c01366
关键词
magnesium; biodegradable; metal matrix composite; SBF; EIS; SVET; cytotoxicity
Currently used titanium and stainless steel implants for permanent vascular stents have disadvantages of corrosion and the need for a second surgery. Biodegradable magnesium alloys have been found to be a promising substitute. This study investigates the biodegradation performance of a magnesium alloy reinforced by zinc and eggshell in simulated body fluid.
Currently, permanent vascular stents are fabricated using titanium and stainless steel implants that are nondegradable and offer high stability, but they have certain disadvantages. For example, the prolonged exposition of aggressive ions in the physiological media and the existence of defects in the oxide film create conditions for corrosion to occur, thus triggering unwanted biological events and compromising the mechanical integrity of the implants. Moreover, when the implant does not need to be permanent, there is the need to submit the patient for a second surgery for implant removal. As a solution for nonpermanent implants, biodegradable magnesium alloys have been deemed a promising substitute, for example, for cardiovascular-related applications and the construction of orthopedic devices. A biodegradable magnesium alloy (Mg-2.5Zn) reinforced by zinc and eggshell was employed in this study as an environment-conscious magnesium (eco) composite (Mg-2.5Zn-xES). Disintegrated melt deposition (DMD) was used to fabricate the composite. Experimental studies were conducted to investigate the biodegradation performance of Mg-Zn alloys containing 3 and 7 wt % eggshell (ES) in simulated body fluid (SBF) at 37 degrees C. Different corrosion techniques were used to study the corrosion behavior of the Mg-2.5Zn-xES composites, including weight loss measurements, hydrogen evolution, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and scanning vibrating electrode technique (SVET). Scanning electron microscopy (SEM) coupled with energy-dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD) were employed to scrutinize the corroded surfaces' morphology and composition. The outcomes indicated that Mg-2.5Zn- 3ES possesses the lowest degradation activity.
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