Mao Yana, Liu Shufu, Liu Shizhong, Wu Guodong, Liu Qi, Du Xusheng
School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China.
Gansu Province Highway Aviation Tourism Investment Group Co., Ltd., Lanzhou 730030, China.
Polymers (Basel). 2024 Dec 17;16(24):3513. doi: 10.3390/polym16243513.
The synergistic effect of CNT and three-dimensional N-doped graphene foam (3DNG) on improving corrosion resistance of zinc-reinforced epoxy (ZRE) composite coatings was studied in this work. Although CNT itself was demonstrated to be effective to promote the anti-corrosion performance of the ZRE coating, the incorporation of additional 3DNG leads to further enhancement of its corrosion resistance under the synergistic effect of the hybrid carbon nanofillers with different dimensions. Both the content of the carbonaceous fillers and the ratio between them affected the performance of the coating. The optimal content of hybrid filler in the coating was determined to be only 0.1% with 3DNG:CNT = 1:3. With the modification of hybrid fillers, the corrosion current of the coating could be reduced by more than six orders of magnitude. Additionally, the immersion test of the pre-scratched coating directly demonstrated the evident contribution of the hybrid fillers to the sacrificial anode-based surface protection mechanism of the coating. These results confirmed the synergistic effect of the hybrid 1D and 3D carbonaceous fillers on promoting the corrosion inhibition of their coating, which could be promising for application in other functional composites.
本工作研究了碳纳米管（CNT）与三维氮掺杂石墨烯泡沫（3DNG）对提高锌增强环氧（ZRE）复合涂层耐蚀性的协同效应。尽管已证明CNT本身可有效促进ZRE涂层的防腐性能，但在不同尺寸的混合碳纳米填料的协同作用下，加入额外的3DNG可进一步提高其耐蚀性。含碳填料的含量及其比例均会影响涂层的性能。涂层中混合填料的最佳含量确定为仅0.1%，3DNG:CNT = 1:3。通过混合填料改性，涂层的腐蚀电流可降低六个数量级以上。此外，对预划痕涂层的浸泡试验直接证明了混合填料对涂层基于牺牲阳极的表面保护机制的显著贡献。这些结果证实了一维和三维混合碳质填料对促进其涂层缓蚀的协同效应，这在其他功能复合材料中的应用可能很有前景。
