类石墨相氮化碳(g-C3N4)具有多片层结构,经剥离后可获得g-C3N4纳米片,将其作为填料加入环氧树脂中制备了新型复合防腐涂层,旨在提高海洋混凝土内部钢筋的抗腐蚀能力。对不同方法制备的氮化碳进行X射线衍射和扫描电镜检测,并且对比了不同溶液剥离后不同含量的纳米相氮化碳环氧复合涂料与体相氮化碳环氧涂料、纯环氧涂料的耐腐蚀性能。结果表明:使用二甲基亚砜(DMSO)溶液超声6h剥离的氮化碳/环氧复合涂层自腐蚀电流最小,且当其添加量为1%的涂层具有最好的防腐蚀效果。
The graphite-like C3N4 (g-C3N4) is of multiple lamellar structure,from which g-C3N4 nanosheets was obtained after being exfoliated.A novel composite anticorrosion coating composed of g-C3N4 nanosheets and epoxy resin(EP)was prepared,aimed at enhancing corrosion resistance of steel reinforcement in marine concrete.X-ray diffraction and scanning electron microscope were performed on g-C3N4 nanosheets obtained by different methods.Composite coatings with different contents of g-C3N4 nanosheet exfoliated using different solvents were compared with EP coating with bulk g-C3N4 and pure EP coating in terms of corrosion resistance.The results indicated that the EP composite coating with g-C3N4 nanosheets exfoliated in DMSO solution under ultrasound for 6h showed the lowest self-corrosion current,and the coating exhibited the optimum corrosion resistance with an addition of 1% g-C3N4 nanosheets.
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