摘要
通过对镁合金微弧氧化过程中阴阳极间距、氧化时间及超声波辅助处理作用研究,探讨其对涂层表面形貌及钙、磷离子的传输的影响规律。采用SEM及EDS分析涂层表面微观形貌、元素分布;借助Image J 6.0软件测定涂层表面孔隙率大小。结果表明:随着阴阳极间距增加,电极间电场集中效应减弱,钙等正离子附着磷酸团向阳离子游动的行程增加,不利于镀液成分沉积,但距离过小时,生物涂层表面孔隙分布不易控制。涂层生长的反应初期,表面的氧化膜薄易击穿,膜的生长速率大,随着时间增长膜厚的增加,击穿变得越来越困难,导致膜生成速率降低。在超声的作用下,增加了电解质扩散的速率,利于Ca等阳离子沉积,通过控制超声时间,可以调控涂层的孔隙率,获得内致密外多孔的生物涂层。
To investigate the influences of the micro-arc oxidation time, the anode-cathode space and the supersonic treatment on the surface morphology and the transferring of Ca and P ions. The surface morphology was observed by SEM and the distribution of elements was analyzed by EDS. The pore size and the porosity were detected using Image J 6.0 software. It was shown that the increase in the anode-cathode space inhibited the deposition of bioactive coating due to the long distance for Ca ions to diffuse. However, a small space would result in difficult control of the surface porosity on the other hand. At the early formation stage of the surface coating, the surface oxidation film was easily punctured, which led to the fast formation of the film. With the increasing oxidation time, it was difficult for the oxidation film to be punctured and the formation rate of the surface film was slowed down as a result. Under the function of ultrasonic, such as mechanical effect, heating and cavitation effect , the ion diffusion was speed up and thesparks were discharged more evenly, therefore the deposition of Ca ion was accelerated and the porosity could be controlled as expected, which increases the bioactivity of the surface. A bioactive coating with a dense inner layer and a porous surface can be obtained by controlling the supersonic function time.
出处
《中国体视学与图像分析》
2011年第4期390-394,共5页
Chinese Journal of Stereology and Image Analysis
基金
黑龙江省教育厅重点项目(1154z1002)
关键词
镁合金
微弧氧化
超声波
生物涂层
magnesium alloy
micro-arc oxidation
ultrasonic wave
bioactive coating
