保护性能的影响
(北京工业大学 材料科学与工程学院，新型功能材料教育部重点实验室，北京 100022)
摘 要: 在0.5 mol/L NH4HF2与1.0 mol/L NH4H2PO4的混合溶液中，利用阳极氧化的方法在钛基体上原位合成自组装有序的TiO2纳米管阵列薄膜材料，研究不同热处理温度对薄膜晶型及光生阴极保护能力的影响。结果表明：在外加电压为20 V时，对钛基体氧化8 h可得到长度为2 μm、内径为80 nm、外径为100 nm的TiO2纳米管阵列；经600 ℃热处理后，TiO2纳米管阵列具有稳定的管状结构，薄膜电极电位可负移至−0.389 V(vs SCE)，表现出较佳的光生阴极保护能力。
关键字: TiO2纳米管阵列薄膜；阳极氧化；光生阴极保护
（Key Laboratory of Advanced Materials, Education Ministry, School of materials and engineering, Beijing University of Technology, Beijing 100022, China）
Abstract:The aligned TiO2 nanotube thin films were fabricated on the Ti substrate in 0.5 mol/L NH4HF2 and 1.0 mol/L NH4H2PO4 aqueous solution via anodic oxidation method. The crystal type and photo-induced cathodic protection performance were investigated after the TiO2 nanotube thin films were annealed at different temperatures. The results show that the nanotubes with inner diameter of 80 nm, outer diameter of 100 nm and length of 2 μm can be obtained after the Ti substrate is anodized for 8 h with the anodizing voltage of 20 V. The nanotube structure still remains even after being annealed at 600 ℃, and their open circuit potential can negatively shift to about −0.389 V(vs SCE), which means that the annealed TiO2 nanotube thin films have excellent photo-induced cathodic protection properties.
Key words: aligned TiO2 nanotube thin film; anodic oxidation; photo-induced cathodic protection
