Cao Guangqun, Ruan Yilei, Liu JianHua, Hu Zhiyong, Zhu Hailin
School of Mechanical and Electrical Engineering, North University of China, Taiyuan, 030051, Shanxi, China.
School of Chemistry and Chemical Engineering, North University of China, Taiyuan, 030051, Shanxi, China.
Sci Rep. 2025 Jul 1;15(1):22288. doi: 10.1038/s41598-025-06528-2.
In this paper, a self-healing anticorrosive coating with pH response based on epoxy was prepared. Firstly, triazinyl corrosion inhibitor (Inh) was loaded into mesoporous molecular sieve (MCM-41) by the vacuum impregnation method. Polyethylenimine (PEI) and sodium polystyrene sulfonate (PSS) were coated on the surface through the layer-by-layer (LBL) self-assembly method. Then a pH-responsive self-healing anti-corrosion coating Inh@MS/PEI/PSS-EP was obtained by adding the newly prepared nanocapsules to the organic epoxy coating. Eventually, foutier transform infrared spectroscopy (FT-IR), N adsorption/desorption, Zeta potential test, thermogravimetry (TG), testultraviolet-visible absorption spectroscopy (UV-vis), electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), and atomic force microscopy (AFM) were used to investigate the pH response, corrosion resistance, self-healing properties of the prepared coating. The results demonstrate that the coating prepared by this method can actively release Inh in alkaline environment. EIS and surface topography analysis manifest the decay-resistance of the organic epoxy coating was improved. The results of the molecular dynamics (MD) simulation show that Inh can adsorb on the carbon steel surface, which is consistent with the experimental results. The corrosion resistance of the modified epoxy coating was improved, after 30 days of immersion, the |Z| of the modified epoxy coating is 3 orders of magnitude higher than that of the pure epoxy coating.
本文制备了一种基于环氧树脂的具有pH响应的自修复防腐涂层。首先，通过真空浸渍法将三嗪基缓蚀剂（Inh）负载到介孔分子筛（MCM-41）中。通过层层（LBL）自组装法在其表面包覆聚乙烯亚胺（PEI）和聚苯乙烯磺酸钠（PSS）。然后将新制备的纳米胶囊加入到有机环氧涂料中，得到pH响应型自修复防腐涂层Inh@MS/PEI/PSS-EP。最终，采用傅里叶变换红外光谱（FT-IR）、N吸附/脱附、Zeta电位测试、热重分析（TG）、紫外可见吸收光谱（UV-vis）、电化学阻抗谱（EIS）、扫描电子显微镜（SEM）和原子力显微镜（AFM）对所制备涂层的pH响应、耐腐蚀性能和自修复性能进行了研究。结果表明，该方法制备的涂层在碱性环境中能主动释放Inh。EIS和表面形貌分析表明有机环氧涂层的抗衰减性能得到了改善。分子动力学（MD）模拟结果表明，Inh能吸附在碳钢表面，与实验结果一致。改性环氧涂层的耐腐蚀性能得到提高，浸泡30天后，改性环氧涂层的|Z|比纯环氧涂层高3个数量级。
