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Synergistic Effect of Polypyrrole-Intercalated Graphene for Enhanced Corrosion Protection of Aqueous Coating in 3.5% NaCl Solution
ACS Applied Materials & Interfaces ( IF 9.5 ) Pub Date : 2017-09-21 00:00:00 , DOI: 10.1021/acsami.7b08325
Shihui Qiu 1, 2 , Wei Li 2 , Wenru Zheng 1 , Haichao Zhao 1 , Liping Wang 1
Affiliation  

Dispersion of graphene in water and its incorporation into waterborne resin have been rarely researched and hardly achieved owing to its hydrophobicity. Furthermore, it has largely been reported that graphene with impermeability contributed to the improved anticorrosion property. Here, we show that highly concentrated graphene aqueous solution up to 5 mg/mL can be obtained by synthesizing hydrophilic polypyrrole (PPy) nanocolloids as intercalators and ultrasonic vibration. On the basis of π–π interaction between PPy and graphene, stacked graphene sheets are exfoliated to the thickness of three to five layers without increasing defects. The corrosion performance of coatings without and with PPy and graphene is obtained by potential and impedance measurements, Tafel curves, and fitted pore resistance by immersing in a 3.5 wt % NaCl solution. It turns out that composite coating with 0.5 wt % graphene additive exhibits superior anticorrosive ability. The mechanism of intercalated graphene-based coating is interpreted as the synergistic protection of impermeable graphene sheets and self-healing PPy and proved by the identification of corrosion products and the scanning vibrating electrode technique.

中文翻译:

聚吡咯插层石墨烯对3.5%NaCl溶液中水性涂料增强腐蚀防护的协同作用

石墨烯在水中的分散及其掺入水性树脂的研究很少,由于其疏水性而很难实现。此外,大量报道了具有不渗透性的石墨烯有助于改善的耐腐蚀性。在这里,我们表明,通过合成亲水性聚吡咯(PPy)纳米胶体作为嵌入剂和超声振动,可以得到高达5 mg / mL的高浓度石墨烯水溶液。根据PPy和石墨烯之间的π–π相互作用,将堆叠的石墨烯片剥落至三到五层的厚度,而不会增加缺陷。通过电势和阻抗测量,Tafel曲线以及浸入3.5 wt%的NaCl溶液,可以得到具有和不具有PPy和石墨烯的涂层的腐蚀性能。结果表明,具有0.5wt%石墨烯添加剂的复合涂层表现出优异的抗腐蚀能力。插层式石墨烯基涂层的机理被解释为不可渗透的石墨烯片材与PPy自修复的协同保护,并通过腐蚀产物的鉴定和扫描振动电极技术得到了证明。
更新日期:2017-09-21
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