表面处理镁合金接骨板耐蚀性和微动磨损性能研究

Study of the Anti-corrosion and Anti-fretting Properties of Surficial Treated magnesium Alloy Bone Plate

针对镁合金作为金属接骨板时由于降解速率过快导致其机械性能恶化的问题,该文选用ZK60镁合金作为研究对象,首先在其表面通过微弧氧化处理形成外层多孔的氧化层,然后采用电沉积方法在氧化层上沉积羟基磷灰石涂层,对多孔表面进行封孔处理,采用体外模拟试验测试其耐腐蚀性能和微动磨损性能。结果表明,两者能够有效提高镁合金的耐腐蚀性能,其中,后者的耐腐蚀性能较好,和前者相比,后者的微动磨损性能明显降低,涂层剥落明显。

The weakening of mechanical properties caused by rapid degradation has been an impediment to the clinical application of magnesium aloy for a long time. In this paper, the effect of surface treatment on the anti-corrosion and anti-fretting properties of magnesium aloy ZK60 was studied. Firstly, an oxidizing layer whose outer layer was porous was first made on the surface of magnesium aloy through micro-arc oxidation treatment （MAO）. Then ahydroxyapatitecoating was fabricated by electrodeposition on the oxidizing layer to seal the porous layer. The corrosion resistance and fretting performance of them were investigated in vitro under a simulated bone-plate service condition. Polarization testing results showed that both of them can signifi cantly enhanced the corrosion resistance of magnesium aloy and the corrosion resistance of the latter was better. The fretting testing results showed that obvious coatingfl aking occurred on the worn surface of the latter, and its anti-fretting properties are inferior to that of the former.