Hydrophobic and chemically bonded BNNSs@PDA/ODA nanosheets to enhance the protective properties of silicone-epoxy coatings on 2024 Al-alloy

IF 6.5 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES Composites Communications Pub Date : 2024-09-19 DOI:10.1016/j.coco.2024.102096

Rongcao Yu, Zhihai Lin, Minglong Luo, Bing Lei, Fengyuan Shu, Xin Yuan

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Abstract

In the challenging marine environment, organic coatings often fail to provide long-lasting protection. This study presents a novel approach for synthesizing multifunctional nano-pigments by utilizing hydrophobic and chemically bonded BNNSs@PDA/ODA nanosheets. The synthesis involves anchoring polydopamine (PDA) onto boron nitride nanosheets (BNNSs), followed by grafting octadecyl amine (ODA). This dual modification effectively prevents agglomeration of BNNSs and enhances their adhesion with silicone-epoxy resins at the interface. Comprehensive characterization confirms the successful grafting of ODA onto PDA-modified BN nanosheets, significantly improving the barrier properties of coatings. Remarkably, after immersing in a 3.5 wt% NaCl solution for 75 days, the composite coating BNNSs@PDA/ODA-SE exhibits an impedance modulus (|Z|_0.01Hz) of 10¹⁰ Ω cm² at low frequency, surpassing that of pure SE coating by nearly three orders of magnitude. The superior protective performance of the composite coating can be attributed to the synergistic effect between the physical barrier generated by BNNSs, insoluble complexes formed by Al³⁺-PDA, and the high hydrophobic surface network provided by ODA.

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疏水和化学键合 BNNSs@PDA/ODA 纳米片增强 2024 铝合金上硅环氧涂层的保护性能

在充满挑战的海洋环境中，有机涂层往往无法提供持久的保护。本研究提出了一种利用疏水性和化学键合的 BNNSs@PDA/ODA 纳米片合成多功能纳米颜料的新方法。合成过程包括将聚多巴胺（PDA）锚定到氮化硼纳米片（BNNSs）上，然后接枝十八胺（ODA）。这种双重改性有效地防止了氮化硼纳米片的团聚，并增强了它们与硅环氧树脂在界面上的粘附性。综合表征证实，ODA 成功接枝到 PDA 改性的 BN 纳米片上，显著提高了涂层的阻隔性能。值得注意的是，在 3.5 wt% 的 NaCl 溶液中浸泡 75 天后，BNNSs@PDA/ODA-SE 复合涂层在低频下的阻抗模量（|Z|0.01Hz）达到 1010 Ω cm2，比纯 SE 涂层高出近三个数量级。这种复合涂层的优异保护性能可归因于 BNNSs 产生的物理屏障、Al3+-PDA 形成的不溶络合物和 ODA 提供的高疏水表面网络之间的协同效应。

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来源期刊

Composites Communications Materials Science-Ceramics and Composites

CiteScore

12.10

自引率

10.00%

发文量

340

审稿时长

36 days

期刊介绍： Composites Communications (Compos. Commun.) is a peer-reviewed journal publishing short communications and letters on the latest advances in composites science and technology. With a rapid review and publication process, its goal is to disseminate new knowledge promptly within the composites community. The journal welcomes manuscripts presenting creative concepts and new findings in design, state-of-the-art approaches in processing, synthesis, characterization, and mechanics modeling. In addition to traditional fiber-/particulate-reinforced engineering composites, it encourages submissions on composites with exceptional physical, mechanical, and fracture properties, as well as those with unique functions and significant application potential. This includes biomimetic and bio-inspired composites for biomedical applications, functional nano-composites for thermal management and energy applications, and composites designed for extreme service environments.