Abstract Although nano “green” coatings with excellent corrosion resistance have attracted great attention, the inhibition efficiency is still limited due to the lack of knowledge about the correlation between molecular structure and anticorrosion performance. Here, we fabricated a series of 3,4-dihydroxy- l -phenylalanine adlayers on self-assembled monolayers (SAMs) with varying end groups. We found that both NH2 and CF3 SAMs were more conducive to the adsorption of DOPA and a flat adsorption conformation was preferentially adopted, with the plane of the phenylene ring parallel to the surface via cation-π interactions or hydrophobic interactions, leading to a compact and dense adlayer. Such DOPA-SAM multilayers can effectively protect the substrate from corrosion by suppressing the diffusion of aggressive water and acid molecules as well as the electrodissolution of metals. The lowest corrosion current of adlayers reaches 6.96 μA cm−2 which is much lower than that of bare substrate and other anticorrosion surfaces reported previously. The results provide guidance on the design of green anticorrosion materials via selecting SAMs that bridge organic and metal interface.

中文翻译：

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通过受控分子自组装构建具有耐腐蚀性的 DOPA-SAM 多层膜

摘要 尽管纳米“绿色”涂层具有优异的耐腐蚀性能受到了广泛的关注，但由于缺乏对分子结构与防腐性能之间相关性的了解，其缓蚀效率仍然有限。在这里，我们在具有不同端基的自组装单层 (SAM) 上制造了一系列 3,4-二羟基-l-苯丙氨酸吸附层。我们发现 NH2 和 CF3 SAMs 都更有利于 DOPA 的吸附，并且优先采用平坦的吸附构象，亚苯基环平面通过阳离子-π 相互作用或疏水相互作用平行于表面，导致紧密和致密的adlayer。这种 DOPA-SAM 多层膜可以通过抑制腐蚀性水和酸分子的扩散以及金属的电溶解来有效地保护基材免受腐蚀。Adlayers 的最低腐蚀电流达到 6.96 μA cm-2，远低于先前报道的裸基板和其他防腐表面的腐蚀电流。结果通过选择桥接有机和金属界面的 SAM 为绿色防腐材料的设计提供了指导。