Effect of silica-loaded polydopamine-modified graphene oxide nanocomposites on the corrosion resistance of polyester coatings

IF 2.7 3区 化学 Q2 POLYMER SCIENCE Journal of Applied Polymer Science Pub Date : 2024-09-13 DOI:10.1002/app.56260
Guoxin Ding, Jun Liu, Yuexiang Hu, Guojun Cheng, Chenfeng Sun, Yan Liu, Xiangxiang Chen
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Abstract

On the basis of the complex environment of port terminals, the corrosion resistance of coatings for accompanying metal facilities is a primary factor that needs to be considered. This study prepared polydopamine-modified graphene oxide loaded with silicon dioxide (PGO@SiO2) functional filler, which was incorporated into polyester resin (PR) by extrusion mixing. The PGO@SiO2/PR composite coating was obtained by electrostatic spraying and high-temperature curing. Fourier transform infrared spectroscopy, x-ray diffraction, and other results confirmed the successful preparation of the PGO@SiO2 functional filler. In addition, contact angle, adhesion, and corrosion resistance tests were performed on the composite coating. Compared with pure PR coating, the surface hydrophobicity and adhesion of the composite coating were significantly improved compared with the pure PR coating. Furthermore, the electrochemical impedance spectroscopy of the carbon steel substrate composite coating confirmed that after immersion in salt solution, the low-frequency impedance modulus of the composite coating could be maintained at 8.63 × 108 Ω·cm2, which was more than two orders of magnitude higher than that of the pure PR coating. Thus, PGO@SiO2 could significantly enhance the corrosion resistance of the PR coating and hinder the infiltration of corrosive media. It has broad prospects for engineering applications because of its excellent anticorrosive performance.

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二氧化硅负载多巴胺改性氧化石墨烯纳米复合材料对聚酯涂料耐腐蚀性的影响
港口码头环境复杂,配套金属设施涂层的耐腐蚀性是需要考虑的首要因素。本研究制备了负载二氧化硅(PGO@SiO2)功能填料的聚多巴胺改性氧化石墨烯,并通过挤出混合将其加入聚酯树脂(PR)中。通过静电喷涂和高温固化获得了 PGO@SiO2/PR 复合涂层。傅立叶变换红外光谱、X 射线衍射等结果证实了 PGO@SiO2 功能填料的成功制备。此外,还对复合涂层进行了接触角、附着力和耐腐蚀性测试。与纯 PR 涂层相比,复合涂层的表面疏水性和附着力得到了显著改善。此外,碳钢基底复合涂层的电化学阻抗谱证实,在盐溶液中浸泡后,复合涂层的低频阻抗模量可保持在 8.63 × 108 Ω-cm2,比纯 PR 涂层高出两个数量级以上。因此,PGO@SiO2 可以显著增强 PR 涂层的耐腐蚀性,并阻止腐蚀性介质的渗入。由于其优异的防腐性能,在工程应用中具有广阔的前景。
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来源期刊
Journal of Applied Polymer Science
Journal of Applied Polymer Science 化学-高分子科学
CiteScore
5.70
自引率
10.00%
发文量
1280
审稿时长
2.7 months
期刊介绍: The Journal of Applied Polymer Science is the largest peer-reviewed publication in polymers, #3 by total citations, and features results with real-world impact on membranes, polysaccharides, and much more.
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