Abstract Magnesium alloys are currently being investigated in orthopedic applications due to their biodegradability and mechanical properties. However, sometimes these benefits are limited by their high corrosion rate in the physiological environment before healing of damaged bones. A large number of recent researches in this field have been dedicated to the control of magnesium corrosion rate by surface protection using new and advanced coatings. In this work, hydroxyapatite powders were coated on the anodized Mg-based alloy substrates by using high velocity oxy-fuel (HVOF) spraying. Increasing of the bioactivity and reduction of the released hydrogen gas during corrosion of the substrate were two main objects of this work. Phase formations were characterized by X-ray diffraction (XRD). It was found that around 96% of the phases formed were hydroxyapatite. The amounts of hydrogen gas released during magnesium corrosion tests in the simulated body fluid (SBF) were measured to evaluate the corrosion resistance of the coated samples. Hydroxyapatite (HA) coating reduced the hydrogen evolution from 100 per cm 2 ml to about 15 per cm 2 ml after 29 h of immersion.

中文翻译：

---

高速氧燃料喷涂镁基合金纳米结构羟基磷灰石涂层的制备与表征

摘要 镁合金由于其可生物降解性和机械性能，目前正在骨科应用中进行研究。然而，有时这些益处受限于它们在受损骨骼愈合之前在生理环境中的高腐蚀率。该领域最近的大量研究致力于通过使用新型先进涂层进行表面保护来控制镁腐蚀速率。在这项工作中，通过使用高速氧燃料 (HVOF) 喷涂将羟基磷灰石粉末涂覆在阳极氧化的镁基合金基材上。提高生物活性和减少基材腐蚀过程中释放的氢气是这项工作的两个主要目标。通过X射线衍射(XRD)表征相形成。发现大约96%的形成相是羟基磷灰石。测量模拟体液 (SBF) 中镁腐蚀试验期间释放的氢气量，以评估涂层样品的耐腐蚀性。羟基磷灰石 (HA) 涂层在浸泡 29 小时后将析氢量从每厘米 2 毫升 100 个减少到每厘米 2 毫升约 15 个。