Synergistic active-passive corrosion protection of steel by a pH-responsive CeO2@ZrP epoxy coating enabled by interfacial engineering

IF 7.3 2区材料科学 Q1 CHEMISTRY, APPLIED

Progress in Organic Coatings Pub Date : 2025-09-05 DOI:10.1016/j.porgcoat.2025.109637

Yiqian Lv , Bo Wang , Jingmao Zhao , Haiqing Liu , Ziji Li , Fangze Zi , Yuhao Guo

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Abstract

To overcome the critical limitation of conventional epoxy coatings in providing long-term barrier effect against corrosion species and on-demand corrosion inhibition at damaged sites, this study develops a self-protective CeO₂@ZrP/EP composites coating via in-situ hydrothermal growth of pH-responsive CeO₂ nanoparticles on lamellar α-ZrP nanosheets. The hydroxyl-rich CeO₂ nanoparticles not only enhance interfacial compatibility by filling voids and creating mechanical interlocking between α-ZrP nanosheets and the epoxy matrix, but also enable pH-triggered Ce^3+/4+ release under acidic condition. After 60 days immersion, the composite coating achieved a low-frequency impedance modulus (|Z|_0.01Hz) of 3.5 × 10⁹ Ω·cm², which is four orders of magnitude higher than pure EP coating (3.7 × 10⁵ Ω·cm²). Crucially, elemental mapping confirmed 2.0 wt% cerium enrichment at artificial scratches, demonstrating autonomous active inhibition. This dual-action strategy synergistically integrates durable barrier protection with intelligent corrosion inhibition, providing long-term steel protection in marine environments.

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通过界面工程实现ph响应CeO2@ZrP环氧涂层对钢的协同主动-被动腐蚀防护

为了克服传统环氧树脂涂层在提供对腐蚀物种的长期屏障效应和损坏部位的按需腐蚀抑制方面的关键局限性，本研究通过在层状α-ZrP纳米片上原位水热生长ph响应CeO2纳米颗粒，开发了一种自保护CeO2@ZrP/EP复合涂层。富含羟基的CeO2纳米颗粒不仅通过填充空隙和在α-ZrP纳米片与环氧基之间形成机械联锁来增强界面相容性，而且还可以在酸性条件下通过ph触发Ce3+/4+释放。经过60天的浸泡，复合涂层的低频阻抗模量（|Z|0.01Hz）达到3.5 × 109 Ω·cm2，比纯EP涂层（3.7 × 105 Ω·cm2）提高了4个数量级。最重要的是，元素映射证实了人工划痕处2.0 wt%的铈富集，证明了自主主动抑制。这种双重作用策略协同集成了耐用屏障保护和智能缓蚀，为海洋环境中的钢材提供长期保护。

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

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.