摘要：TiO2本身是一种绿色无污染的防腐蚀涂层材料，TiO2涂层光阴极保护技术受到人们广泛的关注，但是TiO2存在禁带宽度宽，电子和空穴复合比高等问题，使得TiO2的广泛应用受到限制；C3N4相比TiO2有着更快的电子迁移速率，两者有着相近的交错能带位置和禁带宽度，当两者复合后可以加快光生电子空穴的分离使得载流子寿命延长，来提高TiO2涂层的性能。

本实验针对TiO2的禁带宽度宽，电子和空穴复合比高问题，通过固结法制备C3N4/TiO2复合涂层，采用恒流电沉积法在涂层上沉积Ni(OH)2得到C3N4/TiO2-Ni(OH)2复合涂层，并研究复合涂层的光生阴极防护及光储性能。通过电化学工作站、金相显微镜、X射线衍射仪、扫描电子显微镜等仪器对其进行结构及光电抗腐蚀性能表征。测试结果表明：通过恒流沉积引入Ni(OH)2到C3N4/TiO2复合涂层，可有效改善C3N4/TiO2复合涂层防腐蚀能力。电沉积时间为1200s、沉积电流为2mA时复合涂层防腐蚀性能最佳。

关键字：氢氧化镍;碳化氮；二氧化钛；复合涂层；光阴极保护

Abstract：TiO2 itself is a kind of green pollution-free anti-corrosion coating material, TiO2 coating photocathode protection technology has been widely concerned, but the TiO2 forbidden band width, electron and hole composite ratio of higher problems, making the wide application of C3N4/TiO2 has a faster electron transfer rate compared with TiO2, both of which have similar staggered band position and band gap. When the two composite can accelerate the separation of photo-generated electron holes, the carrier lifetime is prolonged Improve the performance of TiO2 coating.

In this study, Ni(OH)2 was deposited on the coating by constant current electrodeposition method by solidification method for the preparation of C3N4/TiO2 composite coating with high band gap width, electron and hole recombination ratio of TiO2. C3N4/TiO2-Ni(OH)2 composite coating, and study the composite coating of the photoelectric cathode protection and optical storage performance. The structures were characterized by electrochemical workstation, metallographic microscope, X-ray diffractometer and scanning electron microscope (SEM). The results show that Ni(OH)2 to C3N4/TiO2 composite coating can be improved by constant current deposition, which can effectively improve the corrosion resistance of C3N4/TiO2 composite coating. Electrodeposition time is 1200 s, and the deposition resistance is 2mA. The composite coating has the best anti - corrosion performance.

Keywords: Ni(OH)2; C3N4/TiO2; Composite coating; Light cathodic protection

目录

第一章 绪论 1

1.1 研究背景 1

1.2 二氧化钛的晶体结构和物理化学性质 2

1.2.1 二氧化钛的物理化学性质 2

1.2.2 二氧化钛晶体结构的简介 2

1.2.3 TiO2的光生阴极保护作用原理 3

1.2.4 TiO2涂层的制备方法 4

1.3.2 Ni(OH)2-TiO2的研究 5

1.4 本文选题意义及研究内容 6

第二章 实验内容 7

2.1 实验材料 7

2.2 实验仪器与设备 8

2.3 基底处理 8

2.4 C3N4/TiO2复合涂层的制备 8

2.5 制备C3N4/TiO2-Ni(OH)2复合涂层 9

2.6 C3N4/TiO2-Ni(OH)2涂层的电化学测试 9

2.7 复合涂层的金相显微镜观察 11

2.8 复合涂层的X射线衍射测试 11

第三章 实验数据分析 12

3.1 复合涂层的光电转换性能 12

3.1.1 开关灯下的复合涂层的电流-时间曲线比较 12

3.1.2 开关灯下的复合涂层的极化曲线比较 13

3.1.3 开关灯下的复合涂层的交流阻抗 14

3.1.4 开关灯下的复合涂层的循环伏安特性曲线 15

3.2沉积电流时间变化对复合涂层的耐腐蚀性能影响 15

3.2.1沉积时间不同的C3N4/TiO2-Ni(OH)2复合涂层的交流阻抗图谱 16

3.2.2沉积时间不同的C3N4/TiO2-Ni(OH)2复合涂层的电流-时间图 18