(北京科技大學(xué) 腐蝕與防護(hù)中心，北京 100083)
摘 要: 采用熱分解法制備鈦基IrO2-Ta2O5涂層陽極，鈦基體經(jīng)噴砂和酸蝕處理后分別在550、600、650、700和750 ℃下的高純氮?dú)鈿夥障逻M(jìn)行氮化處理，研究鈦基體氮化處理對(duì)IrO2-Ta2O5涂層鈦陽極壽命和電催化活性的影響。結(jié)果表明：經(jīng)550 ℃氮化處理時(shí)，鈦基體表面酸蝕產(chǎn)生的TiH2未大量分解，同時(shí)生成鈦的氮化物，表面形成一層氫化物和氮化物膜，有利于IrO2的成核和晶粒細(xì)化，IrO2-Ta2O5涂層具有多孔性特征，且電極表面析出的活性物質(zhì)IrO2晶粒尺寸更小、分布更均勻，平均晶粒尺寸小于20 nm，具有較佳的電催化活性和較長(zhǎng)的壽命，加速壽命和伏安電荷值分別達(dá)到1 066 h和68.4 mC/cm2。
關(guān)鍵字: IrO2-Ta2O5涂層鈦陽極；氮化處理；壽命；電催化活性
（Laboratory for Corrosion-Erosion and Surface Technology, Corrosion and Protection Center,
University of Science and Technology of Beijing, Beijing 100083, China）
Abstract:IrO2-Ta2O5 coated titanium anodes were prepared by thermal decomposition, and Ti substrate were nitrogen treated at 550, 600, 650, 700 and 750 ℃ after sandblasting and acid etching. The effect of nitrogen treatment of titanium substrate on accelerated life and electro-catalytic properties of IrO2-Ta2O5 coated titanium anode were studied. The results show that, during the nitriding process at 550 ℃, the TiH2 produced by acid etching on the surface of titanium substrate is not composed in massive and forms titanium nitride. At the same time, the formed hydride and nitride film on the surface is in favor of nucleation and grain refining of IrO2. The IrO2-Ta2O5 coatings are porous and the precipitated IrO2 is smaller and more well-distributed. The average grain size of IrO2 is less than 20 nm. The IrO2-Ta2O5 coated titanium anode with the substrate nitride at 550 ℃ owned the best and electro-catalytic characteristics that the voltammetric charge is 68.4 mC/cm2 and the longest life is 1 066 h.
Key words: IrO2-Ta2O5 coated titanium anode; nitrogen treatment; accelerated life; electro-catalytic properties
