The surface treatment on oxide film of pure titanium Part 1. The effect of Anodic oxidation

目的：研究阳极氧化对纯钛种植材料氧化膜的影响。方法：5片直径9mm厚2mm的纯钛在升压速度为7～8v／min、电流密度≤10mA／cm。的条件下分别进行阳极氧化处理，（A）10v10min，（B）24v10min，（C）40v10min，（D）24v40min，（E）24v2h。用potentiostat仪检测以上样品在生理盐水和人造海水中的电化学行为。结果：以上样品的颜色呈：A蓝色，B淡黄色，C粉红色，D金黄色，E深黄色。随着电压的升高和作用时间的延长，2．55峰渐渐强化，2．34峰弱化。在生理盐水中，阳极氧化膜的开路电势稳定于0mV，而自然氧化膜则很快从一50上升到～40mV，极化电流比自然氧化膜的低100倍。在人造海水中，阳极氧化膜的开路电势稳定在-90mV，自然氧化膜则从-480mV快速上升到-310mV，且活化电流明显高于阳极氧化膜。结论：阳极氧化膜的颜色可能和膜的厚度有关，而颜色对种植体上的修复体有影响，因此，金黄色被选为理想的颜色。2．55和2．34峰的变化规律尚无法解释。阳极氧化膜的稳定性和耐腐蚀性远远高于自然氧化膜。因此，阳极氧化法是一种提高纯钛氧化膜耐腐蚀性的好方法。

Objectives： To study the oxide film of pure titanium implant material treated by anodic oxidation. Methods： Five commercially pure （CP） titanium sheets （gmm in diameter and 2mm thick） were treated by the speed of 7 -8 v/min of potential, the current density ~〈10mA/cm2 to （A） 10v for 10min, （B） 24v for 10min, （C） 40v for 10min, （D） 24v for 40min, （E） 24v for 2hr in Kawahara~ electrochemical solution. The electro- chemical behavior of anodic oxide film and natural oxide film was studied using a potentiostat. Results： The samples color changed from white to the following sequence blue, light gold, pink, media gold and dark gold. Along with potential and time going on, XRD patterns showed that the peak 2.55 strengthened, and peak 2.34 weakened. The voltage - time curve in physiological salt solution （PSS） showed that the open circuit potential （OCP） of the anodic oxide was very stable at 0mV. Natural oxide increased quickly from -50 mV to -40mV and plateaued 350s later at -40mV. The curve of anodic polarization in the same liquid showed that the polarized current was 100 times lower than that of natural oxide film. In artificial seawater （ASW） the OCP of the anodic oxide was stable at -90mV. Natural oxide in ASW did not stop rising from -480mV to -310mV during 1000s. The active current appeared to be much greater than that of the anodic oxide film. Conclusion： The color of the oxide film may be related to the thickness and influenced the future prosthetics as an implant. So gold was chosen as the ideal color. The reason was not clear why the rule of altering at peak 2.55 and 2.34 below the surface titanium oxides. The stability and corrosive - resistance of the anodic oxide film was much higher than that of natural oxide film. Anodic oxidation was a good way to enhance the pure titanium corrosive -resistance in vitro.