Self-Reporting and Self-Healing Dual Functional Anticorrosive Coating based on Tannic Acid Additives
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摘要: 通过一步合成法制备了负载单宁酸(TA)的显色、缓蚀双功能介孔二氧化硅纳米填料(TA-MSNs),将其掺杂到环氧涂层中,探究涂层的自预警和自修复性能。首先对TA的显色性能及缓蚀性能进行了表征,接着对TA-MSNs纳米填料的形貌结构以及TA的释放行为规律进行了探究,并综合分析纳米填料添加量对涂层自预警及自修复性能的影响规律。盐雾实验结果表明,涂层的自预警效果与填料含量呈正相关,5 %(w)以上的TA-MSNs添加量可赋予涂层明显的显色性能。电化学阻抗谱和表面分析结果表明,TA-MSNs在涂层中的含量为5 %时,破损涂层的低频阻抗模值比纯环氧破损涂层高出2个数量级。当涂层破损时,涂层中释放的TA分子能够与钢铁腐蚀形成的Fe3+发生络合,产生蓝黑色预警金属腐蚀,同时络合物可形成金属表面保护膜层,抑制了腐蚀反应的进一步发展。综上,添加5 % TA-MSNs的环氧涂层具有优异的自预警和自修复效果。Abstract: Tannic acid molecules are loaded into mesoporous silica nanoparticles (TA-MSNs) by one-step synthesis method to endow them with corrosion sensing and corrosion inhibition dual functions. TA-MSNs are added into the epoxy coatings to explore the self-reporting and self-healing performances of composite coatings. Firstly, the coloration and corrosion inhibition properties of TA are characterized. Then, the morphology and structure of TA-MSNs are investigated, and the release behaviors of TA from TA-MSNs studied. The influence of nanofiller content on the self-reporting and self-healing performances of coatings is comprehensively analyzed. Salt spray test indicates that the self-reporting effect of the coating is positively correlated with the filler content, and the addition of more than 5 %(w) TA-MSNs could give the coating obvious coloration effect. Electrochemical measurement and surface analysis show that the low-frequency impedance modulus (|Z|0.01 Hz) of the damaged coating with 5 % TA-MSNs is two orders of magnitude higher than that of the damaged blank epoxy coating. When the coating is damaged, TA molecules released in the coating can be complexed with Fe3+ formed during steel corrosion, resulting in blue-black coloration for corrosion reporting, and the complex adsorbed on the metal surface can form a protective film layer to inhibit further corrosion reaction. In summary, the epoxy coating with 5 % TA-MSNs possesses excellent self-reporting and self-healing performance.
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Keywords:
- self-reporting coating /
- self-healing coating /
- tannic acid /
- corrosion inhibitor
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