摘要：钢铁是人们生产建设的基础，提高钢铁的使用寿命能够显著降低资源的浪费，因此，提高钢铁的抗腐蚀能力一直是世界各国科学家长期以来不断研究的重要课题。MoS2作为层状过渡金属硫化物在光电转换以及催化等领域具有重要的应用前景。纳米级别的二硫化钼边缘结构复杂，有很高的不饱和性，反应性高，所以在催化剂方面引起了人们广泛的关注；WO3具有较小的禁带宽度，可以有效的利用许多不同能量的可见光，较好的克服了TiO2对光照吸收率低的缺陷，但是WO3易产生光腐蚀，很难获得稳定的光催化性能。因此，MoS2和WO3在光电领域有大的研究意义和应用潜力。

本课题在C3N4/TiO2中分别掺杂MoS2，WO3和NiSO4，制成分别含有这三种物质的复合涂层。采用金相显微镜、扫描电子显微镜，X射线衍射仪等，分析涂层物相结构，利用电化学工作站综合分析测试复合涂层的光生阴极防护性能及光储性能。研究结果表明，在复合涂层中引入金属氧化物是一种有效地提高金属材料抗腐蚀性能的方法，且引入MoS2含量为2.5%时复合涂层的抗腐蚀性能最佳。

关键字：氮化碳；二氧化钛；光催化；光阴极保护

Abstract：Iron and steel is the basis of people's production and construction, to improve the service life of steel can significantly reduce the waste of resources, therefore, to improve the corrosion resistance of steel has been the world's scientists have long been an important issue. MoS2 as a layered transition metal sulfide in the photoelectric conversion and catalysis and other fields have important application prospects. Nano-grade molybdenum disulfide edge structure is complex, with high unsaturation, high reactivity, so the catalyst has aroused widespread concern; WO3 has a small band gap, can effectively use many different energy Visible light, better overcome the TiO2 light absorption rate of low defects, but WO3 easy to produce light corrosion, it is difficult to obtain stable photocatalytic performance. Therefore, MoS2 and WO3 have great research significance and application potential in the field of photocatalysis.

In this paper, MoS2, WO3 and NiSO4 were doped in C3N4/TiO2 to prepare composite coatings containing these three substances respectively. And the electrochemical workstation was used to analyze the corrosion resistance of the coating. In addition, the coating morphology was analyzed by metallographic microscope, scanning electron microscope, X-ray diffractometer and so on. Comprehensive analysis of the test data and the performance of the coating to conduct a comprehensive evaluation.

The results show that the doping of MoS2 is an effective method to improve the corrosion resistance of TiO2, and the corrosion resistance of carbon nitride/titanium dioxide doped with 10% molybdenum disulfide is the best.

Keywords:C3N4；TiO2；Photocatalysis；Photocathode protection

目录

第一章绪论 1

1.1研究背景 1

1.2二氧化钛的性质及研究进展 2

1.2.1二氧化钛的性质 2

1.2.2二氧化钛光催化的原理 2

1.3氮化碳的研究现状 3

1.3.1氮化碳的性质 3

1.3.2氮化碳/二氧化钛复合涂层的改性 3

1.3.3氮化碳/二氧化钛复合涂层改性后的光储性能 4

1.4本文选题意义及研究内容 5

第二章实验与测试 6

2.1实验材料