Fabrication of metal-organic gel (MOG) nanoparticles-enhanced epoxy coating as a pH-sensitive corrosion inhibitor under diverse environmental conditions

IF 7.3 2区材料科学 Q1 CHEMISTRY, APPLIED

Progress in Organic Coatings Pub Date : 2025-08-30 DOI:10.1016/j.porgcoat.2025.109621

Amir Reza Oroujzadeh , Ali Nematollahzadeh , Amin Dabaleh , Davod Seifzadeh , Akbar Shojaei

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引用次数: 0

Abstract

Incorporating rigid nanoparticles into epoxy resins enhances anti-corrosion coatings. Still, it often suffers from limited defect-filling ability due to its inherent rigidity, resulting in suboptimal performance under harsh thermophysical and variable pH conditions. This experimental study investigates the effect of metal-organic gel (MOG) nanoparticles as flexible amorphous gels on enhancing the corrosion resistance of epoxy coatings, with a particular focus on the influence of pH. To achieve this, we synthesized an environmentally friendly zirconium-based metal-organic gel (Zr-MOG) nanostructure at various aging temperatures. Characterization techniques were employed to analyze the morphology and structure of Zr-MOGs, confirming the successful synthesis of meso-microporous amorphous xerogels. The pH sensitivity of optimized Zr-MOG nanoparticles (aged at 140 °C) was evaluated in a 3.5 % NaCl solution. The results indicated variations in surface charge formation under various environmental conditions. The active corrosion protection (self-healing) properties of the coatings were assessed via electrochemical impedance spectroscopy (EIS) at various immersion times. The healing efficiency of Zr-MOG-modified epoxy at acidic, neutral, and alkaline pH levels after 24 h was measured to be 472.7 %, 287.8 %, and 208.8 %, respectively, suggesting very efficient corrosion protection at various pH values. Furthermore, field emission scanning electron microscopy (FE-SEM) images of the scratched coating regions confirmed that the Zr-MOG nanoparticle-modified coating (Ep/Zr-MOG-pH-3) exhibited excellent performance in an acidic environment. However, the highest corrosion resistance was exhibited by Ep/Zr-MOG-pH-7, with an impedance value of ~260 kΩ cm². These findings demonstrate the potential of Zr-MOG nanoparticles to improve the performance of epoxy coatings in corrosive conditions.

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不同环境条件下金属有机凝胶（MOG）纳米颗粒增强环氧树脂ph敏感缓蚀剂涂层的制备

在环氧树脂中加入刚性纳米颗粒可以增强防腐涂层。然而，由于其固有的刚性，它的缺陷填充能力有限，导致在恶劣的热物理和可变的pH条件下性能不佳。本实验研究了金属有机凝胶（MOG）纳米颗粒作为柔性非晶凝胶对环氧涂料耐腐蚀性的影响，特别关注ph值的影响。为了实现这一目标，我们在不同的老化温度下合成了一种环保的锆基金属有机凝胶（Zr-MOG）纳米结构。采用表征技术分析了Zr-MOGs的形貌和结构，证实了中微孔非晶干凝胶的成功合成。优化后的Zr-MOG纳米颗粒（140°C老化）在3.5% NaCl溶液中对pH值的敏感性进行了评价。结果表明，在不同的环境条件下，表面电荷的形成是不同的。通过电化学阻抗谱（EIS）评价了不同浸泡时间下涂层的主动防腐（自愈）性能。zr - mog改性环氧树脂在酸性、中性和碱性条件下，24 h后的修复效率分别为472.7%、287.8%和208.8%，表明在各种pH值下都有很好的防腐效果。此外，对涂层划伤区域的场发射扫描电镜（FE-SEM）图像证实，纳米Zr-MOG修饰涂层（Ep/Zr-MOG- ph -3）在酸性环境中表现出优异的性能。Ep/Zr-MOG-pH-7的耐蚀性最高，阻抗值为~260 kΩ cm2。这些发现证明了Zr-MOG纳米颗粒在改善环氧涂料在腐蚀条件下的性能方面的潜力。

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.