In this work micro-arc oxidation (MAO) process in the presence of an alkaline electrolyte with different amounts of graphene oxide (0, 10, 20 and 30 mg/L) has been applied on AZ91 magnesium alloys, successfully. Microstructure, phase evaluation, scratch test, corrosion behavior, bioactivity and antibacterial properties of fabricated ceramic coating were compared. The results reveal that in addition to the GO, composite coating contains MgO and Mg₂SiO₄ ceramics that were produced as a result of oxidation and electrolyte reaction with the Mg during MAO treatment. Addition of the GO into the electrolyte cause to reduction of the pores and cavities produced due to exhausting of the gas bubbles from the discharges channels in the MAO process. Coating with 20 mg/L of GO additive includes a uniform surface and the lowest pores in diameter in comparison with the other specimens that cause to clearly reduction of the corrosion current density to 0.24 A/m². The damaged width of the scratch decreased from about 137 µm for non-added GO to 87 µm for sample 20GO due to strengthening of the ceramic coating by GO reinforcement. Hydroxyapatite phase has grown in a favorable composition over the coatings after soaking in the SBF solution, and the increasing of the GO addition cause to increasing of the antibacterial behavior of the ceramic coating against both of the S. aureus and E. coli bacteria.

在这项工作中，微弧氧化 (MAO) 工艺在碱性电解质和不同数量的氧化石墨烯（0、10、20 和 30 毫克/升）的存在下成功地应用于 AZ91 镁合金。比较了制备的陶瓷涂层的微观结构、相评价、划痕试验、腐蚀行为、生物活性和抗菌性能。结果表明，除GO外，复合涂层还含有MgO和Mg ₂ SiO ₄在 MAO 处理过程中，由于氧化和电解液与 Mg 反应而产生的陶瓷。将 GO 添加到电解质中会导致由于 MAO 过程中从放电通道中排出气泡而产生的孔和空腔的减少。与其他样品相比，使用 20 mg/L GO 添加剂的涂层包括均匀的表面和直径最低的孔隙，这导致腐蚀电流密度明显降低至 0.24 A/m ². 由于 GO 增强陶瓷涂层，划痕的损坏宽度从未添加 GO 的约 137 µm 减少到样品 20GO 的 87 µm。在浸泡在 SBF 溶液中后，羟基磷灰石相在涂层上以有利的组成生长，并且 GO 添加量的增加导致陶瓷涂层对金黄色葡萄球菌和大肠杆菌的抗菌行为增加。