Preparation and Anticorrosive and Biological Performance of Sr‐Containing Microarc Oxidation Layer on Magnesium Alloy

To address the issues of poor corrosion resistance and poor biocompatibility faced by magnesium alloys in bone implants, ceramic layers doped with different concentrations of strontium are developed on AZ91D magnesium alloy substrates using a one‐step microarc oxidation technique. Subsequently, the composition and morphology of the coating are analyzed using scanning electron microscopy, X‐ray diffraction, and X‐ray photoelectron spectroscopy. Corrosion resistance is evaluated in simulated body fluid via electrochemical testing. The antibacterial properties and biocompatibility of the coating are characterized through antibacterial experiments, hemolysis experiments, and cell proliferation experiments. The results show that the coating possesses a rough porous structure, mainly composed of MgO, Mg ₂ SiO ₄ , and Mg phases. Electrochemical test results show that the corrosion resistance of the prepared strontium‐containing coating is 1–2 orders of magnitude higher than that of conventional coatings. Antibacterial experiments show that strontium‐containing coatings have good antibacterial properties. Finally, in cell proliferation experiments, strontium‐containing coatings exhibit superior biocompatibility compared to magnesium substrates and conventional microarc oxidation coatings, the cell proliferation rate remains at 154.86% after 120 h of culture.