采用荧光纳米填料改性环氧涂层实现缺陷可视化

doi:10.11902/1005.4537.2022.202

中国腐蚀与防护学报

2023, Vol. 43

Issue (3): 460-470 CSTR: 32134.14.1005.4537.2022.202 DOI: 10.11902/1005.4537.2022.202

研究报告

本期目录 | 过刊浏览

采用荧光纳米填料改性环氧涂层实现缺陷可视化

胡云飞¹, 曹祥康¹, 马小泽¹, 潘景龙¹, 蔡光义²(

), 董泽华¹(

)

^1.华中科技大学化学院化工学院武汉 430074
^2.海军工程大学电磁能技术全国重点实验室武汉 430033

Fluorescent Nanofiller Modified Epoxy Coatings for Visualization of Coating Degradation

HU Yunfei¹, CAO Xiangkang¹, MA Xiaoze¹, PAN Jinglong¹, CAI Guangyi²(

), DONG Zehua¹(

)

^1.School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
^2.National Key Laboratory of Science and Technology on Electromagnetic Energy, Naval University of Engineering, Wuhan 430033, China

全文: PDF(16681 KB) HTML

摘要:

通过水热法制备了8-羟基喹啉锌 (ZnQ₂) 荧光耐蚀双功能纳米填料，并添加到环氧树脂中制备荧光指示底漆；以单宁酸修饰的碳纳米管 (TA-CNTs) 作为填料制备高阻隔性环氧面漆，最终合成具有荧光缺陷指示与高耐蚀的双功能涂层。利用SEM、FT-IR、XRD、荧光光谱等验证了荧光纳米材料的成功合成；通过电化学测试和盐雾实验对该复合涂层的耐蚀性进行了评价，并通过荧光显微镜对复合改性涂层的缺陷指示功能进行了验证。结果表明：合成的ZnQ₂纳米填料具有优异的荧光指示和缓蚀作用，复合涂层经30 d的中性盐雾实验后，其低频阻抗|Z|_{0.01 Hz}仍保持在2.95×10⁹ Ω·cm²，表现出了优异的耐蚀性。当复合涂层发生机械损伤时，涂层破损处在365 nm紫外照射下可发生强烈荧光。且经过盐雾实验10 d后，涂层缺陷处的荧光依旧保持良好，表明该荧光涂层有利于对涂层缺陷的快速诊断和维修指示。

关键词 ：荧光, 缺陷指示, 双功能, 涂层, 耐蚀

Abstract：

Zinc 8-hydroxyquinoline (ZnQ₂) bifunctional nanofiller with fluorescent and inhibitive properties was prepared by hydrothermal method, which was added into epoxy resin as a fluorescent indicative primer. Tannic acid-wrapped carbon nanotubes (TA-CNTs) was filled into epoxy resin topcoat to achieve high corrosion resistant. Accordingly, the obtained composite coatings both featured dual-function properties. SEM, FT-IR, XRD, and fluorescence spectroscopy were employed to verify the successful synthesis of fluorescent nanofiller. Corrosion resistance of the composite coatings was confirmed through salt spraying and electrochemical tests. Fluorescence microscopy was applied to evidence the self-indicator of defects on the composite coatings. The results show that the synthesized ZnQ₂ nanofiller is an excellent fluorescent indicator and corrosion inhibitor. After 30 d salt spraying test, the low-frequency impedance |Z|_{0.01 Hz} of the composite coating sustains above 2.95×10⁹ Ω·cm², indicative of high corrosion resistance. When the coating was damaged mechanically, a strong fluorescence emitted under 365 nm under ultraviolet irradiation at the defective areas. Moreover, the fluorescence emitting capability present favorable durability even after 10 d salt spraying test, which would provide promising indication for rapid defect diagnosis and maintenance.

Key words： fluorescence defect indication dual function coating corrosion resistance

收稿日期: 2022-06-21 32134.14.1005.4537.2022.202

ZTFLH:

TG174

基金资助:国家自然科学基金(51771079);国家自然科学基金(52001127)

通讯作者: 董泽华，E-mail: zhdong@hust.edu.cn，研究方向为金属腐蚀与防护以及腐蚀监测方法等；
蔡光义，E-mail: caiguangyi@hust.edu.cn，研究方向为涂层老化机制及功能改性

Corresponding author: DONG Zehua, E-mail: zhdong@hust.edu.cn;
CAI Guangyi, E-mail: caiguangyi@hust.edu.cn

作者简介: 胡云飞，男，1997年生，硕士生

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引用本文:

胡云飞, 曹祥康, 马小泽, 潘景龙, 蔡光义, 董泽华. 采用荧光纳米填料改性环氧涂层实现缺陷可视化[J]. 中国腐蚀与防护学报, 2023, 43(3): 460-470.
HU Yunfei, CAO Xiangkang, MA Xiaoze, PAN Jinglong, CAI Guangyi, DONG Zehua. Fluorescent Nanofiller Modified Epoxy Coatings for Visualization of Coating Degradation. Journal of Chinese Society for Corrosion and protection, 2023, 43(3): 460-470.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2022.202 或 https://www.jcscp.org/CN/Y2023/V43/I3/460

图1 荧光环氧复合涂层的制备流程

图2 ZnQ2纳米粒子的SEM形貌及EDS谱

图3 ZnQ2颗粒样品的红外光谱，XRD谱及XPS谱

图4 ZnQ2样品的荧光光强及365 nm紫外光照射的荧光图，不同添加量的ZnQ2添加到环氧涂层后的荧光光强及环氧底漆的附着力曲线

图5 铝合金浸泡在不含和含有ZnQ2的3.5%NaCl溶液中的Bode图及宏观腐蚀形貌

图6 铝合金分别浸泡在不含和含有ZnQ2的3.5%NaCl溶液浸泡3 d后的表面SEM像

图7 CNTs和TA-CNTs的FT-IR及CNTs和TA-CNTs的XRD

图8 CNTs和TA-CNTs在乙醇中不同静置时间后的沉降示意图

图9 EP涂层，ZnQ2@EP涂层，ZnQ2-CNTs@EP涂层的SEM图

图10 不同涂层经盐雾老化后的EIS图，等效电路及涂层低频阻抗|Z|0.01 Hz随盐雾时间的变化曲线

图11 划伤涂层经不同盐雾时间后的宏观形貌

图12 不同涂层在紫外光照射下和ZnQ2+CNTs@EP复合涂层经不同时间盐雾老化后的荧光照片及盐雾老化前后的荧光耐久性形貌

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