Dual Anticorrosive and Self-healing Coating Based on Multiresponsive Polyaniline Porous Microspheres

IF 3.7 2区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Langmuir Pub Date : 2024-09-25 DOI:10.1021/acs.langmuir.4c01703

Qingqing Zhang, Kaiyun Wu, Ren Liu, Jing Luo

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Abstract

In this work, a smart self-healing coating with long-term anticorrosion ability was developed based on multiresponsive polyaniline (PANI) porous microspheres. The polyaniline porous microspheres loaded with corrosion inhibitor (benzotriazole, BTA) was prepared by the emulsion template method and photopolymerization. The BTA loaded in the polyaniline microspheres acted as a corrosion inhibitor, while the polyaniline in the shell performed the multiple functions of corrosion inhibition, pH-responsive and photoresponsive release, and photothermal conversion. Owing to the inherent corrosion-inhibiting nature of BTA and PANI, the BTA-loaded polyaniline microsphere could endow coating with dual anticorrosive properties. The coating with polyaniline microspheres did not show any corrosion product after 700 h of salt spray testing, while obvious pitting corrosion could be observed for the blank coating after 100 h of the salt spray test. Thanks to the photothermal properties of PANI, the composite coating exhibited self-healing behavior under NIR light irradiation. The coating with 10 wt % polyaniline microspheres could achieve rapid closure and recover its barrier properties within 5 s of NIR irradiation. And the release of BTA could form a passivation film on scratches to further repair coating defects. The on-command responsive release, high healing efficiency, and excellent anticorrosion properties of this dual self-healing anticorrosion coating provide perspectives on extending the service life of metals.

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基于多反应聚苯胺多孔微球的双重防腐自愈涂层

本研究以多反应聚苯胺（PANI）多孔微球为基础，开发了一种具有长期防腐能力的智能自修复涂层。采用乳液模板法和光聚合法制备了负载缓蚀剂（苯并三唑，BTA）的聚苯胺多孔微球。聚苯胺微球中负载的 BTA 起到了缓蚀剂的作用，而外壳中的聚苯胺则具有缓蚀、pH 响应和光致释放以及光热转换等多重功能。由于 BTA 和 PANI 固有的缓蚀特性，负载 BTA 的聚苯胺微球可赋予涂层双重防腐性能。含有聚苯胺微球的涂层在经过 700 小时的盐雾试验后没有出现任何腐蚀产物，而空白涂层在经过 100 小时的盐雾试验后则出现了明显的点腐蚀。得益于 PANI 的光热特性，复合涂层在近红外光照射下表现出了自修复行为。含有 10 wt % 聚苯胺微球的涂层可在近红外照射 5 秒内实现快速闭合并恢复其阻隔性能。而 BTA 的释放可在划痕处形成钝化膜，进一步修复涂层缺陷。这种双重自修复防腐涂层具有随需释放、高修复效率和优异的防腐性能，为延长金属的使用寿命提供了前景。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Langmuir 化学-材料科学：综合

CiteScore

6.50

自引率

10.30%

发文量

1464

审稿时长

2.1 months

期刊介绍： Langmuir is an interdisciplinary journal publishing articles in the following subject categories: Colloids: surfactants and self-assembly, dispersions, emulsions, foams Interfaces: adsorption, reactions, films, forces Biological Interfaces: biocolloids, biomolecular and biomimetic materials Materials: nano- and mesostructured materials, polymers, gels, liquid crystals Electrochemistry: interfacial charge transfer, charge transport, electrocatalysis, electrokinetic phenomena, bioelectrochemistry Devices and Applications: sensors, fluidics, patterning, catalysis, photonic crystals However, when high-impact, original work is submitted that does not fit within the above categories, decisions to accept or decline such papers will be based on one criteria: What Would Irving Do? Langmuir ranks #2 in citations out of 136 journals in the category of Physical Chemistry with 113,157 total citations. The journal received an Impact Factor of 4.384*. This journal is also indexed in the categories of Materials Science (ranked #1) and Multidisciplinary Chemistry (ranked #5).