Preparation and characterization of Y-doped microarc oxidation coating on AZ31 magnesium alloys

Abstract

The rapid degradation characteristics of magnesium alloys limit its application in the field of orthopedic fracture fixation and cardiovascular stents. This study aimed to improve the corrosion resistance and biocompatibility of AZ31 magnesium alloys and prepare degradable implant materials. Micro-arc oxidation (MAO) was used to change the concentration of yttrium acetate in the electrolyte to prepare coatings with different yttrium content on the surface of AZ31 magnesium alloy. Through characterization, it is proved that the yttrium in the coating mainly exists in the form of Y3+. The polarization potential experiment shows that the micro-arc oxidation coating significantly improves the corrosion resistance of magnesium alloys. With the increase of yttrium acetate concentration in the electrolyte, the corrosion resistance of the coating first increases and then weakens. When the concentration is 0.0035 mol/L, the coating has the highest corrosion resistance. The results of CCK-8 cytotoxicity experiment and cell morphology observation also proved that the cell viability in each group was greater than 140%, and the yttrium-doped coating on the surface of AZ31 magnesium alloy has no cytotoxicity, can promote cell growth, and has good biocompatibility.

Corrosion and Protection of Magnesium Alloys: Recent Advances and Future Perspectives

“…After micro-arc oxidation treatment, magnesium alloy has the excellent properties of both metal materials and inorganic materials, so micro-arc oxidation treatment is a promising surface treatment technology [124]. By adjusting the percentage of yttrium acetate in the electrolyte, Wu et al [125] prepared coatings on the surface of AZ31 magnesium alloy with varying yttrium contents. The analysis results demonstrated that the majority of the yttrium in the coating existed as Y 3+ .…”

“…The corrosion pattern exhibited by the magnesium substrate significantly influenced the failure process of the MAO coating, as it determined the mode of accumulation of corrosion products at the interface. Figure 19 illustrates the surface and cross-sectional micrographs of an MAO-treated magnesium alloy after being immersed in 0.1 M NaCl solution for 420 h. It is generally understood that relying solely on a single polymer coating or surface treatment is inadequate for effectively protecting magnesium alloys against cor- By adjusting the percentage of yttrium acetate in the electrolyte, Wu et al [125] prepared coatings on the surface of AZ31 magnesium alloy with varying yttrium contents. The analysis results demonstrated that the majority of the yttrium in the coating existed as Y 3+ .…”