Wang Juan, Du Peng, Zhao Haichao, Pu Jibin, Yu Chengbing
Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences Ningbo 315201 China
School of Materials Science and Engineering, Shanghai University Shanghai 200444 China.
Nanoscale Adv. 2019 Jul 9;1(9):3443-3451. doi: 10.1039/c9na00155g. eCollection 2019 Sep 11.
There are lots of research studies reporting the excellent performances of waterborne epoxy resin coatings to reduce environmental VOC levels. However, it has also been manifested that waterborne epoxy resin coatings do not have high corrosion resistance because of being hydrophilic. Herein, we utilized a kind of N doped carbon dot (N-CD) which has high ethanol solubility and low cytotoxicity to enhance the corrosion resistance of waterborne epoxy resin coatings as a nanofiller. The N-CDs were obtained through a solvothermal method by using 4-aminosalicylic acid (ASA) as a precursor. The diameter and height of N-CDs confirmed by scanning probe microscopy and transmission electron microscopy are 3-5 nm. Corrosion resistance performance of the coatings without and with N-CDs is investigated by electrochemical impedance spectroscopy by immersing them in 3.5 wt% NaCl (aq) for 70 days. The results indicate that the composite coatings with 0.5 wt% N-CDs show superior anticorrosive performance due to bond interactions between N-CDs and polymer chains, the defect repairing effect of N-CDs and the formation of compact FeO and FeO passivation layers.
有许多研究报告了水性环氧树脂涂料在降低环境挥发性有机化合物（VOC）水平方面的优异性能。然而，也已表明，水性环氧树脂涂料由于具有亲水性，其耐腐蚀性不高。在此，我们利用一种具有高乙醇溶解性和低细胞毒性的氮掺杂碳点（N-CD）作为纳米填料来提高水性环氧树脂涂料的耐腐蚀性。通过使用4-氨基水杨酸（ASA）作为前驱体，通过溶剂热法获得了N-CD。通过扫描探针显微镜和透射电子显微镜确认的N-CD的直径和高度为3-5纳米。通过将不含和含有N-CD的涂料浸泡在3.5 wt%的NaCl（水溶液）中70天，用电化学阻抗谱研究了它们的耐腐蚀性能。结果表明，含有0.5 wt% N-CD的复合涂料由于N-CD与聚合物链之间的键相互作用、N-CD的缺陷修复作用以及致密的FeO和FeO钝化层的形成，表现出优异的防腐性能。
