阳极氧化法制备TiO2膜在模拟深海热液区的耐腐蚀性能

以恒压阳极氧化方法在钛基体上制备TiO₂氧化膜，使用水热釜模拟深海热液区的条件研究其耐腐蚀性能。采用XRD、SEM、接触角测定仪对氧化膜以及腐蚀试样产物进行晶型、表面结构、化学成分和亲疏水性能测定，使用动电位扫描方法对其进行极化曲线测试。结果表明，钛试样和阳极氧化钛试样在模拟深海环境条件下，经过腐蚀反应在表面都生成了一层非致密的TiO₂ 膜，对基体并不能起到保护作用，而阳极氧化生成的致密TiO₂ 膜对基体能够起到很好的保护作用。经腐蚀后钛试样表面有TiH₂相的形成，腐蚀电位负移0.45 V。而阳极氧化钛试样表面没有TiH₂相的形成，且腐蚀电位负移较小，表现出良好的耐腐蚀性能。

Corrosion Behavior of TiO2 Film Prepared by Anodic Oxidation Method in Simulated Deep Sea Hydrothermal Region

TiO₂ films were formed on metallic titanium substrate by anodic oxidation method, and its corrosion resistance was studied in simulated deep sea hydrothermal region by hydrothermal synthesis reactor. The crystal form, chemical composition, microstructure and hydrophobic properties of oxide film and products of corrosion sample were characterized by X-ray diffraction (XRD), scanning electron microscopy(SEM) and water contact angle tester, respectively. Their electrochemical properties were investigated through polarization curves. The results showed that in the simulative deep sea hydrothermal system, the non-compact TiO₂ film which was produced on the surface of Ti and anodic oxidation sample could not protect the substrates well and the non-compact TiO₂ film was different from the anodic oxidation TiO₂ film. The corrosion potential of Ti electrode shifted 0.45 V towards negative direction and TiH₂ formed on the surface of Ti after corrosion, while the corrosion potential of Ti sample processed by anodic oxidation method changed less, and no TiH₂ was produced on its surface. The above results indicated that the TiO₂ films formed on metallic titanium substrates by anodic oxidation method had a good corrosion resistance.