Abstract
Zinc-based alloys are emerging as an alternative to magnesium- and iron-based alloys for biodegradable implant applications, due to their appropriate corrosion performance and biocompatibility. However, localized corrosion occurring on the zinc surface, which is generally associated with restricted mass transport at specific surface sites, such as in confined crevices, declines mechanical strength and can lead to the failure of implant materials. In order to improve corrosion behavior and bioactivity, we explore the effect of a ZnO microsheet coating fabricated on pure Zn via anodic oxidization. Samples were characterized with Scanning Electron Microscope (SEM) (including Energy Dispersive Spectroscopy (EDS), X-ray Photoelectron spectroscopy (XPS), Fourier Transform Infrared Spectroscopy (FTIR), and X-ray Diffraction (XRD)). The microstructured surface consists of parallel Zn trenches on the bottom and ZnO/Zn3O(SO4)2 sheets on the top. This layer shows favorable Ca-phosphate precipitation as well as bovine serum albumin (BSA) adsorption properties. Electrochemical experiments indicate an increased corrosion resistance of surface-modified Zn by the presence of BSA in simulated body fluid. Most noteworthily, localized corrosion that has been previously observed for pure Zn in BSA-containing electrolytes does not occur on the Zn/ZnO-coated surface.
Highlights
Zinc and its alloys have spurred great interest thanks to their physiological function and suitable biodegradation rate [1–4]
A structure with parallel Zn trenches is seen beneath the microsheets (Figure 1c,d), the thickness of the trenched Zn region is around 500 nm
We study the growth of an anodic ZnO microsheet coating via anodization on Zn and explore its influence on the corrosion behavior and biological performance in simulated body fluid (SBF) in the absence and presence of bovine serum albumin (BSA)
Summary
Zinc and its alloys have spurred great interest thanks to their physiological function and suitable biodegradation rate [1–4]. As an essential element for humans, Zn plays a crucial role in biological functions, including the synthesis of enzymes as well as signal transduction, bone formation, and the maintenance of immune and nervous systems [5]. As corrosion of Mg may be too fast (especially in the initial stage of biodegradation), and Fe has been reported to corrode too slowly in the biological environment, Zn may be considered a promising candidate for clinical requirements in term of degradation rate [7]. The concentration of Zn2+ depends on the degradation rate of Zn; it is essential to regulate the corrosion behavior of Zn-based metals
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