The performance enhancement of zinc-rich epoxy coating brought by embedding conventional graphene nanosheets (GNs) is severely restricted due to the inevitable crumpling and folding nature of two-dimensional GNs. Herein, unfolded GNs are riveted on both sides of MgAl-layered double hydroxides (LDHs) via chemical graft method, achieving a novel LDHs/GNs nanocomposites (LGs). Experimental results reveal that, compared with pristine zinc-rich epoxy coatings (ZREs), the cathodic protection duration of LG/ZREs is roughly tripled under an ultra-low loading of net GNs (0.007 wt%), and this performance is even better than 0.2 wt% GNs-embedded ZRE. Compared with conventional GNs with crumpling and folding morphology, unfolded GNs riveted on LDHs perform better in “bridging” the available zinc powders into integrated conductive pathway and twisting the diffusion path of diffusing species in coating matrix.

中文翻译：

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铆接在层状双氢氧化物上的展开石墨烯作为富锌环氧涂层防腐性能的高效增强剂

由于二维石墨烯纳米片（GNs）不可避免的褶皱和折叠性质，通过嵌入传统石墨烯纳米片（GNs）带来的富锌环氧涂层的性能增强受到严重限制。在此，通过化学接枝方法将未折叠的GNs铆接在MgAl层状双氢氧化物（LDHs）的两侧，实现了新型LDHs/GNs纳米复合材料（LGs）。实验结果表明，与原始富锌环氧涂层（ZRE）相比，在超低净负载量（0.007 wt%）下，LG/ZRE的阴极保护持续时间大约延长了三倍，并且这一性能甚至优于原始富锌环氧涂层（ZRE）。 0.2 wt% GNs 嵌入的 ZRE。与具有起皱和折叠形态的传统 GN 相比，铆接在 LDH 上的未折叠 GN 在将可用锌粉“桥接”到集成导电路径和扭转涂层基质中扩散物质的扩散路径方面表现更好。