Robust pH-responsive double-layered self-healing coating with synergistic effects of tannic acid and Ce ions applied on Mg alloy via the phytic acid pretreatment

IF 7.3 2区材料科学 Q1 CHEMISTRY, APPLIED Progress in Organic Coatings Pub Date : 2025-06-01 Epub Date: 2025-02-22 DOI:10.1016/j.porgcoat.2025.109152

Jieru Wan , Yangyang Cao , Yunqiang Li , Yuzhu He , Sheng Wang , Yanli Wang , Dalei Song , Tao Zhang , Jingyuan Liu

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Abstract

Synergistic effect of various inhibitors can impart excellent self-healing properties to organic coatings. Here, we designed a pH-responsive double-layered self-healing system (PCe/DMS-TA@CS-EP) comprising the underlying phytic acid conversion film containing Ce ions and the upper epoxy coating (EP) involving tannic acid (TA)-loaded dendritic mesoporous silica (DMS) encapsulated with chitosan (DMS-TA@CS). The phytic acid conversion film, as a pretreatment layer, can make the adhesion force of PCe/DMS-TA@CS-EP/substrate (8.32 MPa) increase by approximately twofold compared with EP/substrate (4.02 MPa). Meanwhile, its micro-cracks are also employed to load Ce ions. DMS-TA can be wrapped by CS through electrostatic interactions. TA is released from DMS-TA@CS in response to pH stimulation. The superior self-healing abilities of PCe/DMS-TA@CS-EP mainly originate from the synergistic effect of TA and Ce ions. The low frequency impedance modulus of PCe/DMS-TA@CS-EP (9.94 × 10¹⁰ Ω·cm²) is two orders of magnitude higher than that of EP (8.45 × 10⁸ Ω·cm²) after 60 days of immersion, indicating that PCe/DMS-TA@CS-EP possesses durable anti-corrosion performance. This synergistic strategy will offer a highly effective approach for preventing/mitigating the corrosion of metal.

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通过植酸预处理在镁合金上应用具有单宁酸和 Ce 离子协同效应的强 pH 响应型双层自修复涂层

各种抑制剂的协同作用使有机涂料具有优异的自愈性能。在这里，我们设计了一个ph响应的双层自修复系统（PCe/DMS-TA@CS-EP），该系统包括底层含有Ce离子的植酸转化膜和上部含有负载单宁酸（TA）的枝状介孔二氧化硅（DMS）的环氧涂层（EP），该涂层被壳聚糖（DMS-TA@CS）包裹。植酸转化膜作为预处理层，可使PCe/DMS-TA@CS-EP/基材的附着力（8.32 MPa）比EP/基材（4.02 MPa）提高约2倍。同时，其微裂纹也被用来加载Ce离子。DMS-TA可以通过静电相互作用被CS包裹。TA在pH刺激下从DMS-TA@CS释放。PCe/DMS-TA@CS-EP优越的自愈能力主要来源于TA和Ce离子的协同作用。浸泡60天后，PCe/DMS-TA@CS-EP的低频阻抗模量（9.94 × 1010 Ω·cm2）比EP （8.45 × 108 Ω·cm2）高2个数量级，表明PCe/DMS-TA@CS-EP具有持久的防腐性能。这种协同策略将为防止/减轻金属腐蚀提供一种非常有效的方法。

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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.