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Unusual anti-bacterial behavior and corrosion resistance of magnesium alloy coated with diamond-like carbon

机译：涂有金刚石碳的镁合金的异常抗菌性能和耐腐蚀性

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摘要

Magnesium and magneisum alloys are promising materials in degradable biomedical implants and also have inherent anti-bacterial ability. A surface coating can reduce the surface corrosion rate of magnesium-based materials without compromising the anti-bacterial properties. In this work, diamond-like carbon (DLC) coatings are deposited on the AZ31 Mg alloy by one-step plasma immersion ion implantation and deposition (PIIID). After PIIID, the corrosion current density diminishes largely from 3.17 × 10 ~(?4) A cm ~(?2) to 6.53 × 10 ~(?5) A cm ~(?2) . The pH and amounts of leached magnesium ions are also significantly reduced. Meanwhile, 3 × 10 ~(4) bacteria seeded on the AZ31-DLC are completely annihilated within 6 hours in contrast to 5 × 10 ~(3) live ones left on the untreated AZ31 and more than 6 × 10 ~(8) on Si-DLC (DLC deposited on Si). The favorable anti-bacterial behavior of AZ31-DLC is attributed to the combined effects of favorable bacteria adhesion on the DLC surface and local release of hydroxyl and magnesium ions from the magnesium substrate via defects in the DLC films.
机译：镁和Magneisum合金在可降解的生物医学植入物中是有前途的材料，并且还具有固有的抗细菌能力。表面涂层可以降低基于镁基材料的表面腐蚀速率而不会影响抗细菌性质。在这项工作中，通过一步等离子体浸渍离子注入和沉积（PIIID）沉积在AZ31mg合金上的金刚石碳（DLC）涂层。在PIIID之后，腐蚀电流密度主要从3.17×10〜（？4）A cm〜（Δ2）至6.53×10〜（？5）a cm〜（Δ2）。浸出的镁离子的pH和量也显着降低。同时，在AZ31-DLC上播种的3×10〜（4）细菌在6小时内完全湮灭，与5×10〜（3）活在未处理的AZ31上，超过6×10〜（8） Si-DLC（DLC沉积在Si）。 AZ31-DLC的良好抗菌性能归因于DLC表面上有利的细菌粘附的良好效应，以及通过DLC膜中的缺陷通过缺陷的羟基壳体的羟基和镁离子的局部释放。

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