目的 探讨钛阳极氧化前后腐蚀性能的变化.方法 钛表面阳极氧化法制备TiO2纳米管,扫描电镜观察氧化膜的微结构,X线衍射分析氧化膜煅烧前后晶型的变化,极化曲线分析钛阳极氧化前后对腐蚀性能的影响.结果 阳极氧化后,钛表面呈现管径80 nm,管长400 nm的纳米管状结构;X线衍射分析表明阳极氧化膜煅烧后变为锐钛矿晶型;电化学实验表明:光滑钛的破钝电位低于煅烧前后的阳极氧化膜(P<0.05),自腐蚀电位的绝对值、自腐蚀电流和钝化区电流高于煅烧前后的阳极氧化膜(P<0.05),煅烧后钛表面阳极氧化膜的腐蚀性能较煅烧前有所改善,但未见统计学差异.结论 钛经过阳极氧化处理后,表面形成的TiO2纳米管结构可以提高钛的抗腐蚀性能.%Objective To investigate the variation of the corrosion resistance of anodized oxidation film on titanium by electrochemical methods. Methods TiO2 nanotube layer was formed on Ti surface by anodization. The morphology was observed with scanning electron microscope(SEM) and the crystal phase was analyzed using X-ray diffraction(XRD) before and after annealing. Polarization curves were examined by electrochemical methods. Results Titanium oxide nanotubes with 80 nm diameter and 400 nm length was seen on Ti after anodization. The annealing nanotubes was anatase crystalline phase by X-ray diffraction analysis. The self-corrosion potential and break-down potential of smooth Ti were significantly lower than TiO2 nanotubes by anodization (P＜0.05). The self-corrosion current and passived current were significantly higher than Ti02 nanotubes by anodization (P＜0.05). Annealing improved the corrosion resistance of anodized oxidation film on titanium. Conclusion The resuIts of electrochemical examinations indicate that the TiO2 nanotubes by anodization increases the corrosion resistance of titanium.
展开▼
