Abstract
Micro-arc oxidation (MAO) treatment is a simple and effective technique to improve the corrosion resistance for magnesium alloys. However, the presence of micro-pores and cracks on the coatings provides paths for corrosive ions to penetrate into and react with the substrate, limiting the long-term corrosion resistance. In this paper, we designed a composite coating with which GelMA hydrogel coatings with varying thicknesses were prepared on the surface of MAO-coated magnesium alloys via a dip-coating method, aiming to improve the biocorrosion resistance and biocompatibility. The surface morphology, the chemical composition of GelMA hydrogels, and the crystallographic structure of magnesium alloys were characterized by scanning electron microscope (SEM), Fourier-transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD), respectively. The corrosion resistance and biocompatibility of all samples were evaluated through electrochemical and biological experiments. The results demonstrated that the addition of GelMA hydrogel could effectively seal the pores and improve the corrosion resistance and biocompatibility of MAO-coated magnesium alloys, especially for the sample with one layer of GelMA hydrogel, showing high cell proliferation rate, and its current density (Icorr) was two orders of magnitude lower than that of the MAO coating. Besides, the balance mechanism between corrosion and protection was proposed. As a result, the GelMA hydrogel coatings are beneficial to the application of MAO-coated magnesium alloys in bone tissue engineering and other fields.
Highlights
In recent years, magnesium (Mg) and its alloys are attracting immense attention in the clinical applications owing to their excellent biocompatibility and suitable biomechanical compatibility [1,2,3,4,5,6,7].the poor corrosion resistance of magnesium alloys leads to a series of biological problems, such as excessive degradation speed, production of H2, and alkalization in the microenvironment surrounding the implant, which gives rise to the loss of biological function of implants [8]
The chemical in the discharge channels produced by spark
As the surface roughness of implant materials exerted a pronounced influence on cell attachment, we investigated this property using atomic force microscopy (AFM), as depicted in three-dimensional and two-dimensional surface topography, it can be recognized that with the increase attachment, we investigated this property using atomic force microscopy (AFM), as depicted in
Summary
The poor corrosion resistance of magnesium alloys leads to a series of biological problems, such as excessive degradation speed, production of H2 , and alkalization in the microenvironment surrounding the implant, which gives rise to the loss of biological function of implants [8]. It is necessary to control the degradation rate of magnesium alloys for realizing long-term implantation. Surface modifications are considered to be an effective way to improve the corrosion resistance of magnesium alloys [9,10,11,12,13,14]. Among all of the various surface modifications, the MAO. Zhao et al [20] compared the properties of AZ91 alloy before and after the micro-arc oxidation (MAO)
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