阳极氧化对纯钛氧化膜影响的初步研究

目的　对阳极氧化法处理的纯钛植入材料表面氧化膜的微观结构和耐腐蚀性进行了分析 ,旨在了解阳极氧化对纯钛氧化膜的影响。方法　取经打磨、抛光及预处理的纯钛片 6片 ,分别在3种电势下 (10v、2 4v、40v)维持 10min以及在同一电势下 (2 4v)维持不同的时间 (10min、40min、2h) ,进行阳极氧化处理。采用X线衍射法和电化学腐蚀法分析其表面微观结构和耐腐蚀性。结果　X线衍射图谱显示 :随阳极氧化电势的提高 ,纯钛的 2 5 5峰和 2 34峰呈倒置趋势 ,表层钛氧化物的杂峰不多见 ;随着时间的延长 ,纯钛的 2 5 5峰与 2 34峰、1 2 5峰与 1 2 3峰、1 72峰与 1 47峰明显倒置 ,表层钛氧化物的杂峰则先增多后减少。阳极氧化处理的氧化膜开路电势明显正移 ,极化电流减小约10 0倍。结论　控制一定的电势和反应时间可得到相应色彩和结晶度的氧化膜 ,如何利用钛晶体的腐蚀规律是进一步研究的方向。阳极氧化可大大提高钛氧化膜的耐腐蚀性

The preliminary study on the oxide film of pure titanium treated by anodic oxidation

OBJECTIVE: To study the oxide film of pure titanium implant material treated by anodic oxidation and to learn the effect of anodic oxidation on it. METHODS: Six titanium sheets, which were ground, polished and pretreated, were treated by anodic oxidation at 10 v, 24 v or 40 v for 10 minutes and at 24 v for 10 minutes, 40 minutes or 2 hours. The microstructures and the corrosive-resistance of oxide films were studied by means of X-ray diffraction and electro-chemical corrosion. RESULTS: The results of X-ray diffraction showed that the titanic peaks of 2.55 and 2.34 inverted as potential went up. Not many disorderly peaks of titanium oxide were found. And all the peaks of 2.55 and 2.34, 1.25 and 1.23, 1.72 and 1.47 did the same when time went on. Disorderly peaks of titanium oxide first appeared more and then fewer. The open loop potential of the oxide film treated by anodic oxidation moved positively, and polarized current was a 100'th of that of natural oxide film. CONCLUSIONS: The oxide film with a certain color and crystallinity could be controlled by the potential and time. The corrosive-resistance of the oxide film is greatly improved by means of anodic oxidation. It will be the next study how to utilize and adjust the rule of titanium crystal corrosion.