Sol-gel coating prepared using pH-responsive hollow porous organosilica nanocontainers encapsulating 2-mercaptobenzothiazole for enhanced corrosion resistance of aluminum alloy

IF 2.3 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of Sol-Gel Science and Technology Pub Date : 2025-02-18 DOI:10.1007/s10971-025-06677-w

Yi Huang, Chenyang Zhao, Yue Li, Chen Wang, Wenlin Yuan, Di Cheng, Tao Shen, Ji Zhang, Jie Liu, Qianhong Shen, Hui Yang

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引用次数: 0

Abstract

The design of hollow porous organosilica nanocontainers (HPON) loaded with corrosion inhibitors offers innovative strategies to enhance the anticorrosive capabilities of sol-gel-derived anticorrosion coatings. In this study, intelligent pH-responsive nanocontainers, termed MBT@HPON, were fabricated using a selective silica etching method, followed by the encapsulation of 2-mercaptobenzothiazole (MBT) through π-π stacking interactions with the organosilica framework. The release kinetics of MBT from the nanocontainers demonstrated that acidic environments reduced the π-π stacking interaction, thereby imparting an acid-responsive release characteristic to the nanocontainers. The total release of MBT reached 69.6% within 24 h at pH = 3, compared to only 14.6% at pH = 7. These nanocontainers were embedded into a silica nanoparticle/methyltrimethoxysilane composite sol-gel coating, creating an intelligent coating system with active and enhanced corrosion protection on 1060 aluminum alloy. Electrochemical impedance spectroscopy analysis indicated that a 0.5 wt% doping content of MBT@HPON exhibited significantly improved electrochemical impedance for the sol-gel coating, with |Z | _f=0.01Hz exceeding 4 × 10⁷ Ω·cm² after 28 d of 3.5 wt% NaCl solution immersion, significantly higher than the pure composite coating. This superior anticorrosive performance can be attributed to the outstanding compatibility between the organosilica shell and the MTMS/silica-based sol-gel coating, along with the active corrosion inhibition from the release of MBT. This work offers valuable insights into the simple construction of sol-gel coatings with enhanced corrosion resistance based on hollow porous organosilica nanocontainers.

Graphical Abstract

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利用包裹 2-巯基苯并噻唑的 pH 响应型中空多孔有机硅纳米容器制备溶胶凝胶涂层，增强铝合金的耐腐蚀性能

装载缓蚀剂的中空多孔有机硅纳米容器（hon）的设计为增强溶胶-凝胶衍生防腐涂层的防腐能力提供了创新策略。在本研究中，采用选择性二氧化硅蚀刻方法制备了智能ph响应纳米容器MBT@HPON，然后通过与有机二氧化硅框架的π-π堆叠相互作用将2-巯基苯并噻唑（MBT）包裹起来。纳米容器中MBT的释放动力学表明，酸性环境降低了π-π堆积相互作用，从而赋予纳米容器酸响应释放特性。pH = 3时，24 h内MBT总释放量达69.6%，而pH = 7时仅为14.6%。这些纳米容器被嵌入到二氧化硅纳米颗粒/甲基三甲氧基硅烷复合溶胶-凝胶涂层中，形成了一种对1060铝合金具有活性和增强防腐作用的智能涂层体系。电化学阻抗谱分析表明，掺量为0.5 wt%的MBT@HPON显著改善了溶胶-凝胶涂层的电化学阻抗，在3.5 wt% NaCl溶液浸泡28 d后，|Z | f=0.01Hz超过4 × 107 Ω·cm2，显著高于纯复合涂层。这种优异的防腐性能可归因于有机二氧化硅外壳与MTMS/硅基溶胶-凝胶涂层之间的出色兼容性，以及MBT释放的有效腐蚀抑制。这项工作为基于空心多孔有机硅纳米容器的溶胶-凝胶涂层的简单构建提供了有价值的见解。图形抽象

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来源期刊

Journal of Sol-Gel Science and Technology 工程技术-材料科学：硅酸盐

CiteScore

4.70

自引率

4.00%

发文量

280

审稿时长

2.1 months

期刊介绍： The primary objective of the Journal of Sol-Gel Science and Technology (JSST), the official journal of the International Sol-Gel Society, is to provide an international forum for the dissemination of scientific, technological, and general knowledge about materials processed by chemical nanotechnologies known as the "sol-gel" process. The materials of interest include gels, gel-derived glasses, ceramics in form of nano- and micro-powders, bulk, fibres, thin films and coatings as well as more recent materials such as hybrid organic-inorganic materials and composites. Such materials exhibit a wide range of optical, electronic, magnetic, chemical, environmental, and biomedical properties and functionalities. Methods for producing sol-gel-derived materials and the industrial uses of these materials are also of great interest.