Anisotropic LDH/PVDF nanofiber coatings with combined corrosion inhibition and chloride capture for enhanced barrier protection of Q235 steels

IF 7.3 2区材料科学 Q1 CHEMISTRY, APPLIED

Progress in Organic Coatings Pub Date : 2025-10-06 DOI:10.1016/j.porgcoat.2025.109709

Lin Cao , Ruzheng Wang , Wei Wang , Xu Yuan , Jijun Wei , Dongxiao Han , Ye Chen , Yantong Pei , Wen Li , Shougang Chen

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引用次数: 0

Abstract

Long-term corrosion protection of steel is critical for epoxy coatings in marine environments. In this study, electrospun polyvinylidene fluoride (PVDF) nanofibers were functionalized with MgAl layered double hydroxide (LDH) nanosheets and intercalated with 8-hydroxyquinoline (8-HQ) to fabricate PVDF/LDH@8-HQ nanofibers. The resulting system achieved an inhibitor loading of 14.6 wt% and a chloride ion adsorption capacity of 9.80 mmol/g, enabling both active inhibition and ion capture. When incorporated into an epoxy matrix, the nanofibers enhanced coating toughness, adhesion strength, and barrier properties. After 90 days of immersion in 3.5 wt% NaCl, the composite coating maintained a low-frequency impedance modulus above 10⁸ Ω·cm². Electrochemical impedance spectroscopy, OCP monitoring, and SKP analysis revealed reduced delamination and suppressed corrosion at the coating/substrate interface. The improved performance was attributed to the synergistic effects of nanofiber reinforcement, anion exchange capacity of LDH, and controlled release of 8-HQ. This work presents a versatile strategy for developing durable, smart anti-corrosion coatings suitable for harsh marine conditions.

查看原文本刊更多论文

各向异性LDH/PVDF纳米纤维涂层复合缓蚀和氯离子捕获增强Q235钢的屏障保护

在海洋环境中，环氧涂料对钢材的长期防腐是至关重要的。本研究采用MgAl层状双氢氧化物（LDH）纳米片对电纺丝聚偏氟乙烯（PVDF）纳米纤维进行功能化，并嵌入8-羟基喹啉（8-HQ），制备PVDF/LDH@8-HQ纳米纤维。该体系的抑制剂负载为14.6 wt%，氯离子吸附量为9.80 mmol/g，既能有效抑制又能捕获离子。当加入到环氧树脂基体中时，纳米纤维增强了涂层的韧性、粘附强度和阻隔性能。在3.5 wt% NaCl中浸泡90天后，复合涂层的低频阻抗模量保持在108 Ω·cm2以上。电化学阻抗谱、OCP监测和SKP分析显示，涂层/衬底界面的分层减少，腐蚀受到抑制。性能的提高是由于纳米纤维增强、LDH阴离子交换能力和8-HQ控释的协同作用。这项工作为开发适用于恶劣海洋条件的耐用、智能防腐涂层提供了一种通用策略。

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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.