Abstract
Advances in biomedicine and development of modern technologies in the last century have fostered the improvement in human longevity and well-being. This progress simultaneously initiated the need for novel biomaterials. Recently, degradable metallic biomaterials have attracted serious attention in scientific and clinical research owing to their utilization in some specific applications. This work investigates the effect of the polyethylene glycol (PEG) coating of open-cell iron and phosphorus/iron foams on their microstructure and corrosion properties. The addition of phosphorus causes a slight increase in pore size and the deposition of a polymer coating results in a smoothened surface and a moderate decrease in pore diameter. The PEG coating leads to an increase in corrosion rates in both foams and potentially a more desirable product.
Highlights
The massive evolution of novel technologies enabling the production of advanced biomedical devices with higher clinical performance in the last decades has brought increased living standards and life expectancy [1,2,3]
We reported that the degradation rate of coated iron foams increased with increasing thicknesses of the polyethylene glycol (PEG) layer [25], and in this work, we have set out to extend this study to a thicker PEG coating layer and to include both Fe and Fe-phosphorus (Fe/P) foams
electrochemical impedance spectroscopy (EIS) measurements were performed in the potentiostatic mode at a fixed DC potential, which was set at the open circuit potential (OCP)
Summary
The massive evolution of novel technologies enabling the production of advanced biomedical devices with higher clinical performance in the last decades has brought increased living standards and life expectancy [1,2,3]. The main drawback of Fe-based materials is that the degradation rate is usually too slow in physiological environments owing to the deposition of the dense film of corrosion products passivizing the surface [4,5,6,10,14,17,18]. Alloying elements, such as Mn, C, Si, and Pd, increase the degradation rate of iron, but at higher concentrations could cause a potentially toxic effect [4,6]. Electrochemical impedance spectroscopy (EIS) was selected to identify the interfacial properties of uncoated and coated Fe and Fe/P foams and to investigate in detail the degradation process after the foams were exposed to a simulated body fluid
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