Designed a novel EP plus GO/ZRC plus GO coating with bilayered structure for enhancing corrosion resistance of steel substrate
Designed a novel EP plus GO/ZRC plus GO coating with bilayered structure for enhancing corrosion resistance of steel substrate
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DOI：
10.1016/j.jhazmat.2020.123670
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发表时间：
2021-02-05
影响因子：
13.6
通讯作者：
Miao, Lijing
中科院分区：
文献类型：
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作者：
Shen, Lu;Zhao, Wenjie;Miao, Lijing
该研究旨在提供一种有效的方法来结合富锌环氧涂层和石墨烯基涂层的优点。在此，我们介绍了双层结构的ZRC + GO/EP + GO和EP + GO/ZRC + GO涂层。此外，还制备了双层ZRC、ZRC+GO和EP+GO涂层，以比较研究涂层的防腐机理。为了使GO在水性涂料中获得更好的分散性，先后将离子液体（1-氨基乙基-3-甲基溴化咪唑鎓）接枝到GO上，并通过XPS、拉曼和FT-IR结果证实了这一点。电化学阻抗谱（EIS）和盐雾试验结果表明，所制备的EP + GO/ZRC + GO涂层具有优异的耐腐蚀性能，这源于涂层特殊双层结构赋予的阻隔性和阴极保护的协同作用。此外，涂层剥离钢基体的SEM、EDS和XRD结果也表明，EP+GO/ZRC+GO涂层的钢基体在浸泡结束时没有明显腐蚀。
The study aimed to provide an effective way to combine the advantages of both the zinc-rich epoxy coating and the graphene-based coating. Herein, we introduce ZRC + GO/EP + GO and EP + GO/ZRC + GO coatings with bilayered structure. In addition, the bilayered ZRC, ZRC + GO and EP + GO coatings were also fabricated to comparatively investigate the anticorrosion mechanisms of the coatings. In order to obtain better dispersion of GO in waterborne coatings, ionic liquid (1-aminoethyl-3-methylimidazolium bromide) was successively grafted on GO, which was confirmed by XPS, Raman and FT-IR results. The results obtained from electrochemical impedance spectroscopy (EIS) and salt spray test proved that the as-prepared EP + GO/ZRC + GO coating presented superior corrosion protection which was derived from the synergistic effect of barrier property and cathodic protection endowed by the special bilayered structure of the coating. Besides, SEM, EDS and XRD results of the coating-exfoliated steel substrates also revealed the steel substrate coated by EP + GO/ZRC + GO was not obviously corroded at the end of the immersion.