Preparation and Properties of Waterborne Epoxy Anti-Corrosion Coatings Modified by Nano-SiO 2 and Flaky Al

IF 2.7 3区化学 Q2 POLYMER SCIENCE

Journal of Applied Polymer Science Pub Date : 2025-03-31 DOI:10.1002/app.57070

Anhua Feng, Xiaojun Yang, Dingyong He, Hanguang Fu, Mowei Yang

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Abstract

The issue of corrosion prevention for steel has long been a subject that draws widespread concern in the relevant fields. This study focused on the preparation of anti-corrosion coatings on Q235 steel surfaces. Waterborne epoxy resin (WEP) served as the film-forming matrix, with SiO₂ and Al utilized as fillers. Three groups of samples, namely WEP, WEP/SiO₂, and WEP/SiO₂/Al, were prepared. The innovation was introduced in the coating preparation process, where silica sol was substituted for silica powder, effectively augmenting the dispersion of the silica filler within the WEP matrix. The coating morphologies were characterized using a metallographic microscope and scanning electron microscope (SEM). Results showed that compared to the WEP coating, the WEP/SiO₂/Al coating had fewer surface defects. For mechanical property evaluation, pencil hardness and adhesion tests were carried out. It was found that SiO₂ and Al synergistically boosted the pencil hardness of the WEP coating to a maximum of 4H while maintaining a similar adhesion grade to that of the WEP coating. Static water contact angle (WCA) tests indicated that the WCA values of WEP/SiO₂ and WEP/SiO₂/Al coatings were 79° and 81°, higher than that of the WEP coating (76°), and retained good hydrophobicity after 20 wear cycles. Electrochemical impedance spectroscopy tests revealed that the impedance value of the WEP/SiO₂/Al coating reached 2.17 × 10⁸ Ω cm², which is higher than that of the WEP/SiO₂ coating and the WEP coating. Moreover, its corrosion potential shifted positively by 248.8 mV compared to the WEP coating, signifying a significant enhancement in anti-corrosion performance. The excellent comprehensive performance of the WEP/SiO₂/Al coating can be attributed to the fact that SiO₂ and Al synergistically enhance the mechanical and anti-corrosion properties of the WEP coating.

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纳米二氧化硅和片状铝改性水性环氧防腐涂料的制备及性能研究

钢材的防腐问题一直是相关领域广泛关注的课题。本文主要研究了Q235钢表面防腐涂层的制备。以水性环氧树脂（WEP）为成膜基质，以SiO2和Al为填料。制备了WEP、WEP/SiO2和WEP/SiO2/Al三组样品。在涂层制备过程中引入了创新，其中二氧化硅溶胶取代了二氧化硅粉末，有效地增强了二氧化硅填料在WEP基体中的分散性。采用金相显微镜和扫描电镜对涂层形貌进行了表征。结果表明：与WEP涂层相比，WEP/SiO2/Al涂层表面缺陷较少；力学性能评价，进行了铅笔硬度和附着力测试。结果表明，SiO2和Al协同作用使WEP涂层的铅笔硬度达到最大4H，同时保持与WEP涂层相似的附着力等级。静态水接触角（WCA）测试表明，WEP/SiO2和WEP/SiO2/Al涂层的WCA值分别为79°和81°，均高于WEP涂层的76°，且在20次磨损循环后仍保持良好的疏水性。电化学阻抗谱测试表明，WEP/SiO2/Al涂层的阻抗值达到2.17 × 108 Ω cm2，高于WEP/SiO2涂层和WEP涂层。与WEP涂层相比，其腐蚀电位正位移248.8 mV，防腐性能显著提高。WEP/SiO2/Al涂层的优异综合性能可归因于SiO2和Al协同增强了WEP涂层的机械性能和防腐性能。

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

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.