Easy formation process of anatase-TiO2 coating layer strongly bonded to titanium metal surface
Easy formation process of anatase-TiO2 coating layer strongly bonded to titanium metal surface
复制标题
与钛金属表面牢固结合的锐钛矿-TiO2涂层的简单形成过程
DOI：
10.1111/ijac.14104
复制
发表时间：
2023
影响因子：
2.1
通讯作者：
Katsuya Niidome
中科院分区：
文献类型：
--
作者：
Toshihiro Ishikawa;Katsuya Niidome
由于在其表面层上形成表面钝化膜（金红石型TiO 2），金属钛显示出足够的耐腐蚀性。由于钛金属的表面层（钝化膜）非常稳定，因此通常使用相对复杂的方法进行钛金属的任何官能化。这是因为钛金属的任何直接氧化仅导致在整个温度范围内形成金红石型TiO 2。使用钛化学品的化学反应可以在≤600°C的温度下容易地产生TiO2。采用前驱体法是在钛金属表面制备纳米TiO2涂层的方法之一。然而，在以前的研究中，TiO2层很容易剥离时，他们在流动的水使用。在此，我们描述了一种简单的方法，用于获得牢固结合到钛金属表面的TiO2涂层。在我们的工艺中，钛金属用还原剂预处理以产生表面TiH2层，其缩合反应很容易与前体（由草酸和四丁氧基钛组成）进行。随后，在550°C下在空气中煅烧处理过的钛金属，以实现在纳米TiO2涂层和钛金属表面之间的牢固结合。处理后的金属钛具有良好的光催化活性。
Because of the formation of a surface passive film (rutile TiO2) on its surface layer, titanium metal shows adequate corrosion resistance. As the surface layer (passive film) of titanium metal is very stable, any functionalization of the titanium metal has been generally performed using relatively complicated methods. This is because any direct oxidation of titanium metal only leads to the formation of rutile TiO2over the entire temperature range. Chemical reactions using titanium chemicals can easily produce anatase TiO2at temperatures of ≤600°C. Using precursors is one of the ways of producing an anatase TiO2coating on titanium metal. However, in previous studies, anatase TiO2layers easily peeled off when they were used in flowing water. Herein, we describe a simple process for obtaining an anatase TiO2coating layer strongly bonded to the titanium metal surface. In our process, titanium metal was pretreated with a reducing agent to create a surface TiH2layer, whose condensation reaction easily proceeds with a precursor (composed of oxalic acid and tetra‐butoxy titanium). Subsequently, the treated titanium metal was calcinated at 550°C in air to achieve strong bonding between the anatase TiO2coating layer and titanium metal surface. The treated titanium metal exhibited excellent photocatalytic activity.