在环氧涂料中开发具有自修复防腐性能的 pH 敏感 UiO-66/聚苯胺纳米杂化物,Industrial & Engineering Chemistry Research

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在环氧涂料中开发具有自修复防腐性能的 pH 敏感 UiO-66/聚苯胺纳米杂化物
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2023-05-03 , DOI: 10.1021/acs.iecr.3c00056
Amin Dabaleh ₁ , Akbar Shojaei ₁ , Ali Nematollahzadeh ₂ , Hossein Molavi ₃

Affiliation

目前的研究重点是填充聚苯胺 (PANI) 的环氧涂层及其与 Zr 基金属有机骨架 (MOF) 的纳米杂化物，即 UiO-66 的腐蚀防护行为。在纳米杂化物中以不同重量百分比的 UiO-66 合成杂化纳米颗粒，包括 5、25 和 50 wt%，分别命名为 H5、H25 和 H50。用各种技术表征的纳米粒子的形态特征表明，具有较高 UiO-66 含量的纳米杂化物，即 H25 和 H50，提供了核壳微结构，其多孔核被 PANI 外壳覆盖。对含有纳米颗粒的盐水溶液（3.5 wt% NaCl）的分析表明，UiO-66 会释放出对 pH 敏感的有机化合物和 Zr 阳离子，这可以作为活性腐蚀抑制剂。通过 Tafel 极化法和电化学阻抗谱 (EIS) 研究了浸入含有纳米粒子提取物的盐水溶液中的低碳钢板的腐蚀行为，表明与纯 PANI 相比，杂化纳米粒子具有很强的活性抑制作用。在纳米杂化物中，H25 在浸泡 24 小时后表现出最大的抑制性能，抑制率为 56.7%。含有 0.15 wt% 纳米颗粒的划痕环氧涂层的活性（自修复）腐蚀行为表明，具有 H25 和 H50 的环氧涂层表现出 170% 和 155% 的改善（总电阻（表明，与纯 PANI 相比，杂化纳米颗粒具有很强的活性抑制作用。在纳米杂化物中，H25 在浸泡 24 小时后表现出最大的抑制性能，抑制率为 56.7%。含有 0.15 wt% 纳米颗粒的划痕环氧涂层的活性（自修复）腐蚀行为表明，具有 H25 和 H50 的环氧涂层表现出 170% 和 155% 的改善（总电阻（表明，与纯 PANI 相比，杂化纳米颗粒具有很强的活性抑制作用。在纳米杂化物中，H25 在浸泡 24 小时后表现出最大的抑制性能，抑制率为 56.7%。含有 0.15 wt% 纳米颗粒的划痕环氧涂层的活性（自修复）腐蚀行为表明，具有 H25 和 H50 的环氧涂层表现出 170% 和 155% 的改善（总电阻（R _t )) 最佳浸泡时间分别为 5 小时和 3 小时。场发射扫描电子显微镜 (FE-SEM) 对腐蚀后划痕区域的观察，通过能量色散 X 射线光谱 (EDS) 分析证实，揭示了在这些区域形成了抑制剂膜，从而增加了涂层的保护性。

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Development of pH-Sensitive UiO-66/Polyaniline Nanohybrids with Self-Healing Anticorrosive Performance in Epoxy Coatings

The present research focused on the corrosion protection behaviors of epoxy coatings filled with polyaniline (PANI) and its nanohybrid with a Zr-based metal–organic framework (MOF), i.e., UiO-66. Hybrid nanoparticles were synthesized at various weight percentages of UiO-66 in the nanohybrid, including 5, 25, and 50 wt % named H5, H25, and H50, respectively. The morphological features of the nanoparticles characterized with various techniques showed that the nanohybrids with higher UiO-66 content, i.e., H25 and H50, provided a core–shell microstructure with a porous core covered by the PANI outer shell. Analysis of the saline solution (3.5 wt % NaCl) containing the nanoparticles indicated the pH-sensitive release of organic compounds and Zr cations from UiO-66, which could act as active inhibitors against corrosion. The corrosion behavior of the mild steel plate immersed in a saline solution containing the extracts of the nanoparticles, investigated by the Tafel polarization method and electrochemical impedance spectroscopy (EIS), showed that the hybrid nanoparticles played strong active inhibition compared with neat PANI. Among the nanohybrids, H25 exhibited maximum inhibition performance with 56.7% inhibition after 24 h of immersion. Active (self-healing) corrosion behavior of scratched epoxy coatings containing 0.15 wt % nanoparticles was revealed that the epoxy coating with H25 and H50 exhibited 170 and 155% improvement (total resistance (R_t)) at optimal immersion times of 5 and 3 h, respectively. Field emission scanning electron microscopy (FE-SEM) observation of the scratched area after corrosion, confirmed by energy-dispersive X-ray spectroscopy (EDS) analysis, revealed the formation of inhibitor films in those areas, which increased the protectiveness of the coatings.

更新日期：2023-05-03

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