钛合金表面GO/HA/MAO复合膜层的制备及其性能

为了改善钛合金种植体在体液中的腐蚀及摩擦腐蚀行为,延长其在人体环境中的服役时间,在微弧氧化 (MAO)膜层上采用溶胶凝胶(Sol-gel)法于羟基磷灰石(HA)和氧化石墨烯(GO)的混合溶胶中浸渍提拉成膜,从而在 Ti6Al4V 合金表面成功地制备了 GO/ HA/ MAO 复合膜层。 结果表明,MAO 膜层表面的微孔及微球被 GO/ HA 薄膜有效的覆盖且较为致密;膜层的物相组成主要为金红石相及锐钛矿相的 TiO₂、HA、SiO₂ 和GO;根据电化学腐蚀和摩擦腐蚀结果分析知,GO/ HA/ MAO 复合膜层在模拟体液(SBF)中的耐蚀性及耐摩擦腐蚀性相比于 MAO 膜层和 Ti6Al4V 基体均得到了显著提高。

Fabrication and Performance of GO/ HA/ MAO Composite Coating on Titanium Alloy Surface

To improve the corrosion and tribocorrosion behavior of titanium alloy implants in body fluid and prolong their serv- ice time in human environment, the GO/ HA layer was dipped and drawn into film in the mixed sol of hydroxyapatite (HA) and graphene oxide (GO) by Sol-gel method on the micro-arc oxidation (MAO) coating, and the GO/ HA/ MAO composite coatings was successfully prepared on the surface of Ti6Al4V alloy. The results show the micro-pores/ spheres existed on MAO coating surface is effectively covered by GO/ HA layer and the surface morphologies of the composite coatings become denser compared to the MAO coating without GO/ HA treatment. The prepared composite coating is mainly composed by rutile and anatase TiO₂ ,HA, SiO₂ and GO. The results of electrochemical corrosion and tribocorrosion test indicate the corrosion and tribocorrosion resist-ance of GO/ HA/ MAO composite coatings in simulated body fluid( SBF) is largely enhanced by the protective GO/ HA layer, compared to the MAO coating and Ti6Al4V substrate.