摘要金属腐蚀一直都是人们研究的重点课题之一，自从发现在紫外光的照射下，二氧化 钛对金属具有光生阴极保护作用以来，二氧化钛光生阴极技术就因为对环境无污染，保 护过程中无损耗，理论上具有很长的使用寿命等性能受到了人们广泛地关注。81240

本文针对上述问题，采用一步固相法制备 g-C3N4/TiO2 复合物，并以其为核心，在 其中分别引入 WO3 ，硅钨酸以及钨酸铵，制备 WO3-g-C3N4/TiO2 复合涂层，硅钨酸

-g-C3N4/TiO2 复合涂层及钨酸铵-g-C3N4/TiO2 复合涂层，并着重考察引入 WO3 的含量对 复合涂层的结构及光电抗腐蚀性能的影响。采用 X 射线衍射仪（XRD）、扫描电子显 微镜（SEM）、金相显微镜对复合涂层进行结构表征和微观形貌观察，使用电化学工作 站对其进行了极化曲线与交流阻抗测试评价其抗腐蚀性能，分析不同钨源及其不同引入 含量对产物的结构和抗腐蚀性能的影响。

研究表明，在 WO3-g-C3N4/TiO2 复合涂层中引入不同钨源有利于复合涂层的表面致 密性及其光电抗腐蚀性能的改善。制备的复合涂层具有良好的涂层致密性、疏水性与附 着力。通过对复合涂层电化学数据的分析发现不同钨源的复合涂层中 WO3-g-C3N4/TiO2 涂层的光电抗腐蚀性能最高，当 WO3 与 g-C3N4 与 TiO2 的质量比为 2:25:10 时，光电防 腐蚀性能最佳。

毕业论文关键字：WO3，二氧化钛，g-C3N4，复合涂层，光电防腐性能

Abstract Metal corrosion protection has always been one of the key subjects of the study, since the discovery of the protective effect of titanium dioxide on the cathodic protection in the presence of UV light,titanium dioxide photoproduction cathode technology has been widely concerned because of its environmental pollution, no loss in the process of protection, long service life and so on。

This paper aimed at the above problems, using one step solid phase method to prerare g-C3N4/TiO2, with g-C3N4/TiO2 complex as the core, doping WO3, Silicotungstic acid and the ammonium tungstate, Prepared the WO3-g-C3N4/TiO2 composite coating, Silicotungstic acid-g-C3N4/TiO2 composite coating and the ammonium tungstate-g-C3N4/TiO2 composite coating。 The structure characterization and microstructure observation of the composite coatings were characterized by X-ray diffraction(XRD), Scanning electron microscope(SEM) and Metallurgical microscope。 The polarization curves and AC impedance tests were carried out by the electrochemical workstation to evaluate its corrosion resistance, analyzing the effects of different tungsten sources and their different contents on the structure and corrosion resistance of the product。

Research shows, The introduction of different tungsten sources in  the  g-C3N4/TiO2 composite coatings is advantageous to the surface density of the composite coatings and the improvement of the optical and electrical properties of the composite coatings。 The prepared composite coatings have good coating compactness, hydrophobicity and adhesion。 Based on the analysis of the electrochemical data of the composite coating, the WO3-g-C3N4/TiO2   coating in the composite coatings with different tungsten sources was found to have the highest photo electrochemical corrosion resistance, when the mass ratio of WO3 and g-C3N4 and TiO2 was 2:25:10, the photoelectric anti-corrosion performance is the best。

Keywords: WO3, titanium dioxide, g-C3N4, composite coating, photoelectric anti-corrosion properties

目 录

第一章 绪论