Mg-1.0Ca合金微弧氧化膜在模拟体液中的腐蚀降解行为

Corrosion degradation behaviors of micro arc oxidation coatings on Mg-1.0Ca alloys in simulated body fluid

在含植酸钠和碳酸钙的碱性溶液中,采用微弧氧化技术在Mg-1.0Ca合金表面制备钙磷盐涂层。采用扫描电镜、能谱仪和X射线衍射仪分析氧化膜的表面形貌、成分和相组成;通过析氢试验、表面观察法以及浸泡腐蚀失重法分析比较镁钙合金氧化前后在模拟体液中的腐蚀降解行为。结果表明:微弧氧化能显著降低Mg-1.0Ca合金的腐蚀降解速率;浸泡后氧化试样表面钙含量明显增加,表明氧化膜具有很好的生物活性。

The calcium phosphate coatings were prepared by micro arc oxidation （MAO） technique on Mg-1.0Ca alloys in an alkaline solution containing sodium phytate and calcium carbonate. The surface morphology, chemical compositions and phase structure were characterized by scanning electron microscopy （SEM）, energy dispersive spectrometry （EDS） and X-ray diffractometry （XRD）. The corrosion degradation behavior of Mg-1.0Ca alloys before and after MAO treatment in a simulated body fluid （SBF） were compared through the hydrogen evolution test, surface observation method and immersion corrosion weight loss method. The results demonstrate that MAO treatment can significantly reduce the corrosion degradation rate of Mg-1.0Ca alloys. After immersion in SBF, the calcium content of the MAO samples increases significantly, indicating that the obtained micro arc coatings achieve excellent bioactivity.