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富锌层状双氢氧化物对聚偏氟乙烯基涂料在海洋环境中耐腐蚀性能的协同作用

Synergistic Effects of Zn-Rich Layered Double Hydroxides on the Corrosion Resistance of PVDF-Based Coatings in Marine Environments.

作者信息

Alqahtani Hissah A, AlGhamdi Jwaher M, Mu'azu Nuhu Dalhat

机构信息

Department of Chemistry, College of Science, Imam Abdulrahman Bin Faisal University, Dammam 31451, Saudi Arabia.

Department of Environmental Engineering, College of Engineering, Imam Abdulrahman Bin Faisal University, Dammam 31451, Saudi Arabia.

出版信息

Polymers (Basel). 2025 Jan 25;17(3):331. doi: 10.3390/polym17030331.

DOI:10.3390/polym17030331
PMID:39940532
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11821123/
Abstract

In this study, zinc-aluminum layered double hydroxide (ZLDH) and its calcined counterpart (CZLDH) were synthesized and incorporated into a poly(vinylidene fluoride) (PVDF) matrix to develop high-performance anti-corrosion coatings for mild steel substrates. The structural integrity, morphology, and dispersion of the LDH fillers were analyzed using FTIR, XRD, Raman spectroscopy, and SEM/EDS, while coating performance was evaluated through water contact angle (WCA), adhesion tests, and electrochemical techniques. Comparative electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization tests in a 3.5% NaCl solution revealed that the ZLDH/PVDF coating exhibited superior corrosion resistance and long-term stability compared to CZLDH/PVDF and pristine PVDF coatings. The intact lamellar structure of ZLDH promoted excellent dispersion within the polymer matrix, enhancing interfacial adhesion, reducing porosity, and effectively blocking chloride ion penetration. Conversely, calcination disrupted the lamellar structure of ZLDH, reducing its compatibility and adhesion performance within the PVDF matrix. This study demonstrates the critical role of ZLDH's structural integrity in achieving enhanced adhesion, barrier properties, and corrosion protection, offering an effective anti-corrosion coating for marine applications.

摘要

在本研究中,合成了锌铝层状双氢氧化物(ZLDH)及其煅烧产物(CZLDH),并将其掺入聚偏二氟乙烯(PVDF)基体中,以开发用于低碳钢基材的高性能防腐涂层。使用傅里叶变换红外光谱(FTIR)、X射线衍射(XRD)、拉曼光谱以及扫描电子显微镜/能谱仪(SEM/EDS)分析了层状双氢氧化物(LDH)填料的结构完整性、形态和分散情况,同时通过水接触角(WCA)、附着力测试和电化学技术评估了涂层性能。在3.5%氯化钠溶液中进行的比较电化学阻抗谱(EIS)和动电位极化测试表明,与CZLDH/PVDF和原始PVDF涂层相比,ZLDH/PVDF涂层表现出优异的耐腐蚀性和长期稳定性。ZLDH完整的层状结构促进了其在聚合物基体中的良好分散,增强了界面附着力,降低了孔隙率,并有效阻止了氯离子渗透。相反,煅烧破坏了ZLDH的层状结构,降低了其在PVDF基体中的相容性和附着力性能。本研究证明了ZLDH结构完整性在实现增强附着力、阻隔性能和防腐保护方面的关键作用,为海洋应用提供了一种有效的防腐涂层。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e0ba/11821123/a4262c2b4569/polymers-17-00331-g013.jpg
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