Corrosion causes serious steel deterioration with consequent negative impacts on the environment and economy. Organic coatings are widely exploited to provide corrosion protection on low-carbon steel. However, the raw materials and preparation methods for common anticorrosive coatings are not sustainable. In this framework, the efficient microwave-assisted methacrylation of a natural polyphenolic compound, tannic acid (TA), provided a UV-curable monomer with a high degree of substitution. The produced methacrylated tannic acid (MTA) was characterized by means of 31P NMR and FTIR spectroscopies. The UV-curing of MTA by radical photopolymerization was deeply investigated via the real-time FTIR, photo-DSC, and photo-rheological analyses, confirming the high photo-reactivity of MTA with a conversion of 80 % and a gel point at 2.5 s. The UV-cured MTA showed good thermal stability and a glass transition temperature (Tg) of 133 °C. Furthermore, UV-cured MTA coating exhibited high hardness and hydrophobicity. The zeta potential measurement indicated a negatively charged surface with an isoelectric point (IEP) at pH 2.7. Finally, the good corrosion protection performance of UV-cured MTA coating on plasma pre-treated steel surface was assessed through electrochemical impedance spectroscopy.

中文翻译：

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微波官能化天然单宁酸作为防腐紫外线固化涂料


腐蚀会导致钢材严重劣化，从而对环境和经济产生负面影响。有机涂层被广泛用于为低碳钢提供腐蚀保护。然而，常见防腐涂料的原材料和制备方法并不可持续。在该框架中，天然多酚化合物单宁酸 （TA） 的高效微波辅助甲基丙烯酸化提供了具有高度取代性的 UV 固化单体。通过 31P NMR 和 FTIR 光谱对生成的甲基丙烯酸酯化单宁酸 （MTA） 进行表征。通过实时 FTIR、Photo-DSC 和光流变学分析深入研究了自由基光聚合对 MTA 的紫外线固化，证实了 MTA 的高光反应性，转化率为 80%，凝胶点为 2.5 s。UV 固化的 MTA 具有良好的热稳定性和 133 °C 的玻璃化转变温度 （Tg）。 此外，UV 固化的 MTA 涂层表现出高硬度和疏水性。zeta 电位测量表明，在 pH 值为 2.7 时，表面等电点 （IEP） 为负电。最后，通过电化学阻抗谱评估了 UV 固化 MTA 涂层在等离子体预处理钢表面的良好防腐性能。