Abstract Graphene due to its two-dimensional structure, large surface area and high impermeability is regarded as an excellent potential filler for the development of anti-corrosive coatings by creating a natural barrier to the diffusion of electrolytes. Epoxy polymers are widely used as protective coatings, and in the present study, commercially-available graphene nanoplatelets (GNPs) were dispersed into an epoxy resin using three-roll milling (3RM). The GNP-modified epoxy was coated onto mild steel substrates, and cured. The coated panels were immersed into a corrosive environment of 3.5 wt% NaCl aqueous solution for 4–5 days. The adhesion of the coatings to the substrate was then measured using a cross-cut test. The addition of higher loadings of GNPs resulted in a deteriorating corrosion performance, with the 1.5 wt% and 3 wt% coatings exhibiting 53% and 91% damage by area, respectively, after the cross-cut tests. The unmodified epoxy and low GNP content coatings (≤0.5 wt%) demonstrated 0% damage. This shows that the corrosion behaviour of GNP/epoxy coatings is not dominated by barrier effects but by electrochemical factors. The addition of GNPs is only effective at low loadings, as higher contents result in electrically-conductive coatings that facilitate the conduction of corrosion currents.

中文翻译：

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检查石墨烯纳米片对环氧涂层耐腐蚀性的影响

摘要 石墨烯由于其二维结构、大表面积和高抗渗性而被认为是一种极好的潜在填料，可通过为电解质扩散创造天然屏障来开发防腐涂层。环氧聚合物被广泛用作保护涂层，在本研究中，使用三辊研磨 (3RM) 将市售的石墨烯纳米片 (GNP) 分散到环氧树脂中。将 GNP 改性环氧树脂涂覆在低碳钢基材上并固化。将涂层板浸入 3.5 wt% NaCl 水溶液的腐蚀性环境中 4-5 天。然后使用横切测试测量涂层对基材的附着力。添加更高负载量的 GNP 导致腐蚀性能恶化，1. 5 wt% 和 3 wt% 涂层在横切测试后分别表现出 53% 和 91% 的面积损伤。未改性环氧树脂和低 GNP 含量涂层 (≤0.5 wt%) 表现出 0% 的损坏。这表明 GNP/环氧树脂涂层的腐蚀行为不是由阻隔效应决定的，而是由电化学因素决定的。添加 GNP 仅在低负载下有效，因为较高的含量会导致导电涂层，从而促进腐蚀电流的传导。