Xi’an University of Architecture and Technology,Xi’an
本文采用搅拌摩擦加工（Friction stir processing, FSP）制备了含羟基磷灰石（Ca10(PO4)6(OH)2，HA）和银（Ag）颗粒的AZ31Mg合金涂层前驱体，对前驱体表面进行微弧氧化（Micro arc oxidation, MAO），获得了兼具抗腐蚀性和抗菌性的Mg合金涂层。结果表明，前驱体中弥散分布的HA颗粒促进了MAO涂层的生长，提高了涂层厚度，从而提高了涂层的耐蚀性能。同时，FSP制备前驱体过程中，平均粒径为1 μm的Ag颗粒被破碎为平均粒径为2~10 nm的纳米颗粒。在随后MAO过程中，纳米Ag颗粒由前驱体向Mg合金涂层中发生转移。较低的Ag含量降低了涂层的腐蚀电流密度，改善了涂层的耐蚀性能。同时涂层的抗菌性能得到了显著的提高，涂层对金黄色葡萄球菌和大肠杆菌的最高抗菌率分别达到99.4%和99.96%。
In this paper, the AZ31 magnesium (Mg) alloy coating with antibacterial properties and corrosion resistance was successfully obtained through friction stir processing (FSP) combined with micro arc oxidation (MAO). FSP was firstly utilized to introduce hydroxyapatite (HA) and silver (Ag) particles and prepare the precursor of AZ31 Mg alloy coating. Subsequently, MAO was employed to transfer HA and Ag particles into the surface of Mg alloy, then forming the coating. It is shown that the dispersed HA particles in the precursor promoted the coating growth in the MAO process and increased the thickness of the coatings, improving in the corrosion resistance. The Ag particles with an average size of 2-10 nm refined by FSP were easily to be transferred from the precursors to the Mg alloy coatings during the MAO process, the lower Ag content reduces the corrosion current density of the coating and improves its corrosion resistance. At the same time, the antibacterial performance of the coating has been significantly improved, and the coatings exhibited excellent antibacterial properties with the highest rates of against Staphylococcus aureus and Escherichia coli reaching to 99.4% and 99.6%, respectively.
刘子禄,韩鹏,王文,刘强,强凤鸣,谢海瑞,王快社.搅拌摩擦加工结合微弧氧化在AZ31镁合金表面制备新型医用抗菌耐蚀涂层[J].稀有金属材料与工程,,().[Zilu Liu, Peng Han, Wen Wang, Qiang Liu, Fengming Qiang, Hairui Xie, Kuaishe Wang. A new antibacterial and corrosion resistance coating on the AZ31 magnesium alloy prepared via friction stir processing combined with micro arc oxidation[J]. Rare Metal Materials and Engineering,,():].复制