微弧氧化时间对二氧化钛薄膜微观结构与性能的影响
Effects of Micro-arc Oxidation Time on Microstructure and Performance of TiO2 Coatings
项 博, 宋仁国, 李红霞, 郑晓华
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作者单位：(浙江工业大学 机械制造及自动化教育部重点实验室, 浙江 杭州 310014)
中文关键字：微弧氧化； 二氧化钛； 光催化； 氧化时间
英文关键字：micro-arc oxidation; TiO2; photo-catalytic; oxidation time
中文摘要：为提高钛表面原位生长TiO2薄膜层的光催化活性，在恒定电流下，研究了微弧氧化时间对所得膜层光催化活性的影响。利用XRD、SEM和分光光度计研究了氧化膜的相组成、微观结构和光降解效率。 结果表明：随氧化时间的延长，涂层表面微孔孔径增加， 粗糙度和膜厚变大，微孔数量减少；微弧氧化膜主要由金红石型TiO2和锐钛矿型TiO2组成，随氧化时间的延长，金红石相所占比例逐渐增大；膜层具有较高的光催化活性，该能力主要取决于膜内锐钛矿型TiO2的含量，且随着光照时间的延长而提高，并最终趋于稳定。
英文摘要：The effects of oxidation time on the photo-catalytic activity of the films were studied at the constant current density in order to improve photo-catalytic activity of TiO2 films grown on titanium substrate. The speciality of the films such as composition, microstructure and photo-degradation efficiency was studied by SEM, XRD and UV-Vis. The results show that, with the increase of oxidation time, the number of micro-pores decreases, while the size of micro-pores, the roughness and the thickness of MAO coatings increase. The MAO coating is mainly composed of rutile TiO2 and anatase TiO2, and the content of rutile TiO2 increases with the increase of oxidation time. The produced film has high photo-catalytic activity, which is largely attributed to the content of anatase TiO2. The activity enhances more through increasing the oxidation time and comes to a stabilization in the end.