Enhanced anticorrosion of waterborne epoxy coatings by electrochemical exfoliated graphene oxide

IF 7.3 2区材料科学 Q1 CHEMISTRY, APPLIED Progress in Organic Coatings Pub Date : 2025-05-01 Epub Date: 2025-02-17 DOI:10.1016/j.porgcoat.2025.109147

Shengle Hao , Shiyu Hou , Yang Liu , Ding Nan , Deping Xu , Wanci Shen , Feiyu Kang , Zheng-Hong Huang

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Abstract

With the increasingly strict control of volatile organic compounds (VOCs), the research and application of waterborne coatings in the field of steel corrosion protection has been widely concerned. Graphene oxide (GO) and functionalized graphene are commonly used in waterborne epoxy coatings for enhanced anticorrosion. However, little attention has been paid to the effect of particle size of GO on the anticorrosion performance of composite coatings and the anticorrosion mechanism. Herein, the particle size and oxidation degree of GO were controlled by optimizing the current intensity of the electrochemical electrode. And the effects of particle size and oxidation degree of GO on the anticorrosion performance and adhesion strength of the composite coatings were also discussed. After 2 days immersion in 3.5 wt% NaCl solution, the impedance modulus |Z|_0.01Hz of GO-3/WEP increased from 1.68 × 10⁷ Ω·cm² to 6.87 × 10⁸ Ω·cm² compared to WEP. In addition, the anticorrosion mechanism of composite epoxy coating was revealed by Raman mapping and molecular dynamics simulation. Reducing the particle size and increasing the oxidation degree of GO sheets can effectively improve the anticorrosion performance of coatings. This work has theoretical significance for further improving the anticorrosion performance of GO-modified waterborne epoxy resin.

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电化学剥离氧化石墨烯增强水性环氧涂料的防腐性能

随着对挥发性有机物（VOCs）控制的日益严格，水性涂料在钢铁防腐领域的研究和应用受到了广泛关注。氧化石墨烯（GO）和功能化石墨烯通常用于水性环氧涂料，以增强防腐性能。然而，氧化石墨烯的粒径对复合涂层防腐性能的影响及其防腐机理的研究却很少。本文通过优化电化学电极的电流强度来控制氧化石墨烯的粒径和氧化程度。讨论了氧化石墨烯的粒径和氧化程度对复合涂层的防腐性能和附着力的影响。在3.5 wt% NaCl溶液中浸泡2 d后，GO-3/WEP的阻抗模量|Z|0.01Hz从1.68 × 107 Ω·cm2增加到6.87 × 108 Ω·cm2。此外，通过拉曼作图和分子动力学模拟揭示了复合环氧涂层的防腐机理。减小氧化石墨烯片材的粒径，提高氧化石墨烯片材的氧化程度，可以有效提高涂层的防腐性能。该工作对进一步提高氧化石墨烯改性水性环氧树脂的防腐性能具有理论意义。

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来源期刊

Progress in Organic Coatings 工程技术-材料科学：膜

CiteScore

11.40

自引率

15.20%

发文量

577

审稿时长

48 days

期刊介绍： The aim of this international journal is to analyse and publicise the progress and current state of knowledge in the field of organic coatings and related materials. The Editors and the Editorial Board members will solicit both review and research papers from academic and industrial scientists who are actively engaged in research and development or, in the case of review papers, have extensive experience in the subject to be reviewed. Unsolicited manuscripts will be accepted if they meet the journal''s requirements. The journal publishes papers dealing with such subjects as: • Chemical, physical and technological properties of organic coatings and related materials • Problems and methods of preparation, manufacture and application of these materials • Performance, testing and analysis.