Improving the anti-corrosive performance of an epoxy coating by ionic liquid modified layered double hydroxide nanocontainer

IF 6.3 3区工程技术 Q1 ENGINEERING, CHEMICAL Journal of the Taiwan Institute of Chemical Engineers Pub Date : 2025-04-13 DOI:10.1016/j.jtice.2025.106140

Kenan Sun , Yingxue Liu , Jiaqian Duan , Ya Li , Xugeng Guo

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Abstract

Background

Functionalized composite coatings play a key role in protecting metals and alloys against corrosion in harsh environments.

Methods

Layered double hydroxide (LDH) modified with choline benzoate ionic liquid is successfully fabricated through coprecipitation and ion-exchange strategies, and then incorporated into an epoxy to generate the CB-LDH/EP composite coating. The anti-corrosive and self-healing abilities of the CB-LDH/EP are comprehensively evaluated.

Significant findings

The addition of CB-LDH active nanocontainer induces a clear increase in the polarization resistance of the coatings (from 9.36 × 10⁶ to 4.35 × 10⁸ Ω cm²). Moreover, the localized corrosion of the coating surface can be considerably retarded according to the long-term immersion experiments. Such an obvious enhancement in the corrosion resistance is attributed to the synergistic mechanism between the components of the polymer coating. The inherent lamellar structures of LDH enhance the physical barrier effect of the coating. Benefiting from the outstanding ion-exchange behavior, the LDH can serve as a storage station for corrosive anions like chloridion, and simultaneously the released benzoate anions from LDH galleries play a role of active corrosion protection. In addition, the choline cations can be adsorbed to the LDH surface because of their polar groups, indicative of a further improvement in the anti-corrosive performance of the coating.

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离子液体改性层状双氢氧化物纳米容器提高环氧涂料的防腐性能

功能化复合涂层在保护金属和合金免受恶劣环境腐蚀方面发挥着关键作用。方法采用共沉淀法和离子交换法制备了苯甲酸胆碱离子液体修饰的层状双氢氧化物（LDH），并将其掺入环氧树脂中制备CB-LDH/EP复合涂层。对CB-LDH/EP的防腐和自愈能力进行了综合评价。CB-LDH活性纳米容器的加入使涂层的极化电阻明显增加（从9.36 × 106增加到4.35 × 108 Ω cm2）。长期浸渍试验表明，涂层表面的局部腐蚀可以明显减缓。这种明显的耐蚀性增强归因于聚合物涂层组分之间的协同作用机制。LDH固有的层状结构增强了涂层的物理阻隔效应。由于其优异的离子交换性能，LDH可以作为氯离子等腐蚀性阴离子的储存站，同时从LDH通道释放的苯甲酸盐阴离子也起到了有效的防腐作用。此外，由于胆碱阳离子的极性基团，可以吸附在LDH表面，表明涂层的防腐性能进一步提高。

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来源期刊

Journal of the Taiwan Institute of Chemical Engineers 工程技术-工程：化工

CiteScore

9.10

自引率

14.00%

发文量

362

审稿时长

35 days

期刊介绍： Journal of the Taiwan Institute of Chemical Engineers (formerly known as Journal of the Chinese Institute of Chemical Engineers) publishes original works, from fundamental principles to practical applications, in the broad field of chemical engineering with special focus on three aspects: Chemical and Biomolecular Science and Technology, Energy and Environmental Science and Technology, and Materials Science and Technology. Authors should choose for their manuscript an appropriate aspect section and a few related classifications when submitting to the journal online.