Li Yufeng, Liu Shibo, Feng Feng, Li Yiming, Han Yahui, Tong Xinyang, Gao Xiaohui
College of Chemistry and Chemical Engineering, Qiqihar University, Qiqihar 161006, China.
College of Light Industry and Textile, Qiqihar University, Qiqihar 161006, China.
Polymers (Basel). 2024 Sep 19;16(18):2641. doi: 10.3390/polym16182641.
The organic coating on the surface is common and the most effective method to prevent metal materials from corrosion. However, the corrosive medium can penetrate the metal surface via micropores, and electrons cannot transfer in the pure resin coatings. In this paper, a new type of anticorrosive and electrically conductive composite coating filled with graphene oxide/carbon nanotube/polyaniline (GO/CNT/PANI) nanocomposites was successfully prepared by in situ polymerization of aniline (AN) on the surface of GO and CNT and using waterborne epoxy resin (WEP) as film-forming material. The structure and morphology of the composite were characterized using a series of characterization methods. The composite coatings were comparatively examined through resistivity, potentiodynamic polarization curves, electrochemical impedance spectroscopy (EIS), and salt spray tests. The results show that the GO/CNT/PANI/WEP composite coating exhibits excellent corrosion resistance for metal substrates and good conductivity when the mass fraction of GO/CNT/PANI is 3.5%. It exhibits a lower corrosion current density of 4.53 × 10 A·cm and a higher electrochemical impedance of 3.84 × 10 Ω·cm, while only slight corrosion occurred after 480 h in the salt spray test. The resistivity of composite coating is as low as 2.3 × 10 Ω·cm. The composite coating possesses anticorrosive and electrically conductive properties based on the synergistic effect of nanofillers and expands the application scope in grounding grids and oil storage tank protection fields.
表面有机涂层是防止金属材料腐蚀常用且最有效的方法。然而，腐蚀性介质可通过微孔渗透到金属表面，且电子无法在纯树脂涂层中传导。本文通过在氧化石墨烯（GO）和碳纳米管（CNT）表面原位聚合苯胺（AN），并使用水性环氧树脂（WEP）作为成膜材料，成功制备了一种填充有氧化石墨烯/碳纳米管/聚苯胺（GO/CNT/PANI）纳米复合材料的新型防腐导电复合涂层。采用一系列表征方法对复合材料的结构和形貌进行了表征。通过电阻率、动电位极化曲线、电化学阻抗谱（EIS）和盐雾试验对复合涂层进行了对比研究。结果表明，当GO/CNT/PANI的质量分数为3.5%时，GO/CNT/PANI/WEP复合涂层对金属基体具有优异的耐腐蚀性和良好的导电性。其腐蚀电流密度较低，为4.53×10 A·cm，电化学阻抗较高，为3.84×10 Ω·cm，在盐雾试验480 h后仅发生轻微腐蚀。复合涂层的电阻率低至2.3×10 Ω·cm。该复合涂层基于纳米填料的协同效应具有防腐和导电性能，拓宽了在接地网和储油罐防护领域的应用范围。
