PDMAEMA as a pH/temperature- responsive switch enhanced corrosion resistance of self-healing epoxy coatings

IF 5.4 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects Pub Date : 2026-08-19 DOI:10.1016/j.colsurfa.2026.141584

Jiaqi Huang, Jianyu Wang, Wei Xiang, Meiping Wu, Xiaojin Miao

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引用次数: 0

Abstract

A dual-responsive self-healing epoxy coating was developed by incorporating a smart microcapsule (rGO@SiO₂-95S-P). PDMAEMA acted as a responsive gatekeeper, enabling faster 95S release under acidic conditions and at temperatures below its LCST range. Meanwhile, the photothermal conversion of rGO increased the coating temperature under 808 nm NIR irradiation, enhancing epoxy-chain mobility and promoting partial scratch closure. UV-Vis spectroscopy, infrared thermography, optical microscopy, electrochemical measurements, and SEM/EDS were employed to evaluate the responsive release, scratch-recovery behavior, and corrosion protection of the coating. Under NIR irradiation for 600 s, the composite coating reached 48.6 °C and exhibited an average scratch-width reduction of 0.5321 mm. After scratching and NIR treatment, the coating maintains a relatively high |Z|_f=0.01Hz of 5.08×10⁵ Ω·cm² and an R_ct of 8.922×10⁵ Ω·cm². At pH=3, the composite coating exhibited an I_corr of 1.286×10^-8A·cm^-2 and an R_ct of 2.053×10⁷ Ω·cm². SEM/EDS observations further revealed a comparatively uniform Q235 steel surface with fewer coarse corrosion products under acidic conditions. These results demonstrate that the combination of responsive inhibitor release, NIR-induced partial scratch closure, and physical barrier protection provides the composite coating with effective corrosion protection, particularly under acidic conditions.

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PDMAEMA作为pH/温度响应开关，增强了自愈环氧涂料的耐腐蚀性

通过加入智能微胶囊（rGO@SiO₂-95S-P），开发了一种双响应自修复环氧涂层。PDMAEMA作为反应灵敏的看门人，在酸性条件下和低于最低温度范围的温度下，能够更快地释放95S。同时，在808 nm近红外照射下，还原氧化石墨烯的光热转化提高了涂层温度，增强了环氧链的迁移率，促进了部分划痕的闭合。采用紫外可见光谱、红外热像仪、光学显微镜、电化学测量和扫描电镜/能谱仪对涂层的响应释放、划痕恢复行为和防腐性能进行了评价。近红外辐照600 s后，涂层温度达到48.6℃，平均划痕宽度减小0.5321 mm。经过划伤和近红外处理后，涂层的|Z|f=0.01Hz保持在5.08×105 Ω·cm2， Rct为8.922×105 Ω·cm2。在pH=3时，复合涂层的Icorr为1.286×10-8 A·cm-2， Rct为2.053×107 Ω·cm -2。SEM/EDS观察进一步表明，在酸性条件下，Q235钢表面相对均匀，粗腐蚀产物较少。这些结果表明，响应性缓蚀剂释放、nir诱导的部分划痕闭合和物理屏障保护相结合，为复合涂层提供了有效的腐蚀保护，特别是在酸性条件下。

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

Colloids and Surfaces A: Physicochemical and Engineering Aspects 化学-物理化学

CiteScore

8.70

自引率

9.60%

发文量

2421

审稿时长

56 days

期刊介绍： Colloids and Surfaces A: Physicochemical and Engineering Aspects is an international journal devoted to the science underlying applications of colloids and interfacial phenomena. The journal aims at publishing high quality research papers featuring new materials or new insights into the role of colloid and interface science in (for example) food, energy, minerals processing, pharmaceuticals or the environment.