This study focuses on the release kinetics of inhibitor-loaded nanocontainers and the anti-corrosive properties of epoxy coatings doped and undoped with the nanocontainers. In this work, 1-butyl-3-methylimidazolium chloride [Bmim][Cl] was loaded into halloysite nanotubes (HNTs), and the loaded HNTs were encapsulated with polyethyleneimine (PEI)/polyacrylic acid (PAA) and poly(diallyldimethylammonium chloride) (PDADMAC)/polyacrylic acid (PAA) to allow controlled release upon pH stimuli. The polyelectrolyte layer deposition was characterized using zeta potential analysis, and the release profiles were evaluated in neutral, acidic, and alkaline media. The release kinetics was studied and found to conform to the Ritger–Peppas and Korsmeyer–Peppas model, and the results proved that the combination of weak polyelectrolytes (PEI and PAA) provided a good response for up to 50% release of [Bmim][Cl] in acidic and alkaline media after 72 hours. The loaded HNTs encapsulated with the PEI/PAA combination were incorporated into an epoxy coating matrix and applied on an X52 steel substrate. The corrosion resistance of the coated and uncoated substrates was evaluated using electrochemical impedance spectroscopy (EIS) after immersion in a 3.5 wt% NaCl solution up to 72 hours. An artificial defect was created on the coating prior to immersion to evaluate the active corrosion inhibition ability. The coating doped with the smart pH-responsive halloysite nanotubes showed promising results in corrosion protectiveness even after 72 hours of exposure to a salt solution through EIS and SEM.

中文翻译：

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pH响应离子液体负载埃洛石纳米管掺杂环氧树脂涂层的释放动力学研究及防腐行为

本研究的重点是载有抑制剂的纳米容器的释放动力学以及掺杂和未掺杂纳米容器的环氧涂层的防腐性能。在这项工作中，1-丁基-3-甲基咪唑氯化物[Bmim][Cl]被负载到埃洛石纳米管（HNTs）中，负载的HNTs被聚乙烯亚胺（PEI）/聚丙烯酸（PAA）和聚（二烯丙基二甲基氯化铵）封装(PDADMAC)/聚丙烯酸 (PAA) 允许在 pH 刺激下控制释放。使用 zeta 电位分析表征聚电解质层沉积，并在中性、酸性和碱性介质中评估释放曲线。研究了释放动力学，发现其符合 Ritger-Peppas 和 Korsmeyer-Peppas 模型，结果证明，弱聚电解质（PEI 和 PAA）的组合在 72 小时后对酸性和碱性介质中高达 50% 的 [Bmim][Cl] 释放提供了良好的响应。用 PEI/PAA 组合封装的负载 HNT 被结合到环氧树脂涂层基质中，并涂在 X52 钢基材上。在浸入 3.5 wt% NaCl 溶液长达 72 小时后，使用电化学阻抗谱 (EIS) 评估涂层和未涂层​​基材的耐腐蚀性。在浸渍之前在涂层上产生人工缺陷以评估活性腐蚀抑制能力。即使通过 EIS 和 SEM 暴露于盐溶液 72 小时后，掺杂有智能 pH 响应埃洛石纳米管的涂层也显示出良好的腐蚀防护效果。