To enhance the potential application of naturally biodegradable polylactic acid (PLA)-based composites reinforced with magnesium alloy, anodized coatings between Mg and PLA were fabricated on AZ31 magnesium alloy rods. After anodizing (AO) at four different treatment times, the surface demonstrated a typical porous MgO ceramics morphology, which greatly improved the mechanical properties of composite rods compared to untreated pure Mg. This was attributed to the micro-anchoring effect, which increases interfacial binding forces significantly between the Mg rod and PLA. Additionally, the AO layer can also substantially improve the degradability of composite rods in Hank’s solution, due to good corrosion resistance and stronger bonding between PLA and Mg. With a prolonged immersion time of up to 30 days, the porous MgO coating was eventually found to be degraded, evolving to a comparatively smooth surface resulting in a decline in mechanical properties due to a decrease in interfacial bonding strength. According to the current findings, the PLA-clad surface treated Mg composite rod may hold promise for use as a bioresorbable implant material for orthopedic inner fixation.

中文翻译：

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表面处理的AZ31增强聚合物复合材料的增强的机械性能

为了增强镁合金增强的天然可生物降解的聚乳酸（PLA）基复合材料的潜在应用，在AZ31镁合金棒上制备了Mg和PLA之间的阳极氧化涂层。在四个不同的处理时间进行阳极氧化（AO）后，表面呈现出典型的多孔MgO陶瓷形态，与未经处理的纯Mg相比，极大地改善了复合棒的机械性能。这归因于微锚固效应，该效应显着增加了镁棒和PLA之间的界面结合力。另外，由于良好的耐腐蚀性以及PLA和Mg之间的牢固结合，AO层还可以大大改善汉克溶液中复合棒的降解性。浸泡时间长达30天，最终发现多孔MgO涂层已降解，演变为较光滑的表面，由于界面结合强度降低，导致机械性能下降。根据目前的发现，PLA包覆的表面处理过的镁复合材料棒有望用作骨科内固定的生物可吸收植入材料。