Abstract
Iron and magnesium are being considered as promising candidates for biodegradable materials in medical applications, both materials having their specific advantages and challenges. A hybrid of metallic iron and magnesium in a layered composite is studied in the present work, to combine the merits of both metals. A single-step dip-coating method was employed to prepare the layered composite material. Morphology, composition, crystal structure and corrosion behavior of the Mg/Fe sheet were assessed by SEM, EDX, XRD, and electrochemical measurements. The Mg/Fe layered composite sheet is composed of the magnesium substrate, a 1–2 µm metallic iron coating, and a pompon-like Mg(OH)2/MgO top layer. Long-term open-circuit potential measurements revealed that the Mg/Fe sheet samples exhibit a “self-healing” effect in Dulbecco’s modified Eagle’s medium.
Highlights
Since Lane introduced the application of metal plates for bone fracture fixation 100 years ago, metallic biomaterials have achieved huge development for a variety of biomedical applications (Hornberger et al, 2012; Mao et al, 2017; Li et al, 2019)
energy-dispersive X-ray spectroscopy (EDX) analysis was carried out on the whole surface and at special locations to determine the composition of the layered composite coating
A simple, single-step dip coating process was used to fabricate a layered composite coating composed of metallic Fe and Mg(OH)2
Summary
Since Lane introduced the application of metal plates for bone fracture fixation 100 years ago, metallic biomaterials have achieved huge development for a variety of biomedical applications (Hornberger et al, 2012; Mao et al, 2017; Li et al, 2019). The reactions taking place in an aqueous solution are spontaneously driven by the electrochemical properties of the participating elements Mg and Fe, and no external energy was introduced during the process (Yan and Xue, 2006) This approach is in contrast to previous attempts to produce metallic coatings via several deposition ways, such as high velocity oxygen fuel, plasma spraying, physical vapor deposition, laser cladding, sol-gel, and kinetic spraying (Livsey, 1981; Liu et al, 2009; Nezamdoust and Seifzadeh, 2017; Dayani et al, 2018; Ferrández-Montero et al, 2019; Lin et al, 2021; Akhter et al, 2022). The principle of the coating process is the immersion plating of Fe, taking advantage of the difference in the electrochemical potentials of the substrate and the coating material
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