保護(hù)性能的影響
(北京工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院，新型功能材料教育部重點(diǎn)實(shí)驗(yàn)室，北京 100022)
摘 要: 在0.5 mol/L NH4HF2與1.0 mol/L NH4H2PO4的混合溶液中，利用陽(yáng)極氧化的方法在鈦基體上原位合成自組裝有序的TiO2納米管陣列薄膜材料，研究不同熱處理溫度對(duì)薄膜晶型及光生陰極保護(hù)能力的影響。結(jié)果表明：在外加電壓為20 V時(shí)，對(duì)鈦基體氧化8 h可得到長(zhǎng)度為2 μm、內(nèi)徑為80 nm、外徑為100 nm的TiO2納米管陣列；經(jīng)600 ℃熱處理后，TiO2納米管陣列具有穩(wěn)定的管狀結(jié)構(gòu)，薄膜電極電位可負(fù)移至−0.389 V(vs SCE)，表現(xiàn)出較佳的光生陰極保護(hù)能力。
關(guān)鍵字: TiO2納米管陣列薄膜；陽(yáng)極氧化；光生陰極保護(hù)
（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
