Qin Zhihong, Su Yinqiang, Bai Yang, Lu Hangqi, Peng Tao, Zhong Huifeng, Chen Tao, Du Xusheng
The Fifth Engineering Co., Ltd., MBEC, Jiujiang 332001, China.
Zhuhai Communication Group, Zhuhai 519000, China.
Polymers (Basel). 2023 Nov 1;15(21):4302. doi: 10.3390/polym15214302.
To improve the corrosion inhibition of zinc-rich epoxy (ZRE) composite coatings and shed light on the influence of the spatial structure of graphene fillers on the coatings' performance, three-dimensional graphene (3DG) and a conventional graphene sheet (G) were used to modify the ZRE composite paint, respectively. The effect of introducing the 2D G fillers on the anti-corrosion behavior of ZRE was studied comprehensively, and its optimal content was determined to be 0.5 wt%. Interestingly, it was found that, comparing with 2D graphene sheets, the corrosion resistance of the ZRE coating could be enhanced more significantly with incorporating even less 3DG. With introducing only 0.1 wt% 3DG, the corrosion current intensity of the resulting 3DG/ZRE coating was reduced to be about 1/10 that of the G/ZRE coating with the same graphene content and 27% of that of the optimized G/ZRE. The corrosion products of the coating were analyzed with the XRD technique. The results indicated that, in contrast to neat ZRE coating, Zn(CO)(OH) was absent from the corroded 3DG/ZRE coating, confirming its improved long-term anti-corrosion performance. The porous interconnected framework and high crystallinity of 3DG could contribute to not only its facilely mixing with epoxy resin, but also its effective incorporation into the conductive network of zinc micro-flakes, thus enhancing the corrosion resistance of its ZRE coating at a lower content. The innovative technology to improve the anti-corrosion performance of the ZRE coatings via using the 3D graphene fillers should be capable to be extended to other 2D fillers, such as MXenes.
为提高富锌环氧（ZRE）复合涂层的缓蚀性能，并阐明石墨烯填料的空间结构对涂层性能的影响，分别采用三维石墨烯（3DG）和传统的石墨烯片（G）对ZRE复合涂料进行改性。全面研究了引入二维G填料对ZRE防腐行为的影响，并确定其最佳含量为0.5 wt%。有趣的是，发现与二维石墨烯片相比，加入更少的3DG能更显著地提高ZRE涂层的耐腐蚀性。仅引入0.1 wt%的3DG，所得3DG/ZRE涂层的腐蚀电流强度降低至具有相同石墨烯含量的G/ZRE涂层的约1/10，以及优化后的G/ZRE涂层的27%。用XRD技术分析了涂层的腐蚀产物。结果表明，与纯ZRE涂层相比，腐蚀后的3DG/ZRE涂层中不存在Zn(CO)(OH)，证实了其长期防腐性能得到改善。3DG的多孔互连框架和高结晶度不仅有助于其与环氧树脂轻松混合，还能有效地融入锌微片的导电网络，从而在较低含量下提高其ZRE涂层的耐腐蚀性。通过使用3D石墨烯填料提高ZRE涂层防腐性能的创新技术应能够扩展到其他二维填料，如MXenes。
